Merge branch 'master' into master

182 files changed, 6244 insertions, 4936 deletions

diff --git a/src/org/traccar/BaseEventHandler.java b/src/org/traccar/BaseEventHandler.java
index 588406bf4..b6f7e2085 100644
--- a/src/org/traccar/BaseEventHandler.java
+++ b/src/org/traccar/BaseEventHandler.java
@@ -15,7 +15,7 @@
  */
 package org.traccar;
 
-import java.util.Collection;
+import java.util.Map;
 
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -25,13 +25,13 @@ public abstract class BaseEventHandler extends BaseDataHandler {
     @Override
     protected Position handlePosition(Position position) {
 
-        Collection<Event> events = analyzePosition(position);
+        Map<Event, Position> events = analyzePosition(position);
         if (events != null && Context.getNotificationManager() != null) {
-            Context.getNotificationManager().updateEvents(events, position);
+            Context.getNotificationManager().updateEvents(events);
         }
         return position;
     }
 
-    protected abstract Collection<Event> analyzePosition(Position position);
+    protected abstract Map<Event, Position> analyzePosition(Position position);
 
 }
diff --git a/src/org/traccar/BasePipelineFactory.java b/src/org/traccar/BasePipelineFactory.java
index a6446dbaa..771ab8acb 100644
--- a/src/org/traccar/BasePipelineFactory.java
+++ b/src/org/traccar/BasePipelineFactory.java
@@ -30,6 +30,7 @@ import org.jboss.netty.channel.SimpleChannelHandler;
 import org.jboss.netty.handler.logging.LoggingHandler;
 import org.jboss.netty.handler.timeout.IdleStateHandler;
 import org.traccar.events.CommandResultEventHandler;
+import org.traccar.events.DriverEventHandler;
 import org.traccar.events.FuelDropEventHandler;
 import org.traccar.events.GeofenceEventHandler;
 import org.traccar.events.IgnitionEventHandler;
@@ -50,6 +51,7 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
 
     private FilterHandler filterHandler;
     private DistanceHandler distanceHandler;
+    private RemoteAddressHandler remoteAddressHandler;
     private MotionHandler motionHandler;
     private GeocoderHandler geocoderHandler;
     private GeolocationHandler geolocationHandler;
@@ -65,6 +67,7 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
     private AlertEventHandler alertEventHandler;
     private IgnitionEventHandler ignitionEventHandler;
     private MaintenanceEventHandler maintenanceEventHandler;
+    private DriverEventHandler driverEventHandler;
 
     private static final class OpenChannelHandler extends SimpleChannelHandler {
 
@@ -125,10 +128,15 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
             }
         }
 
-        distanceHandler = new DistanceHandler(Context.getConfig().getBoolean("coordinates.filter"),
+        distanceHandler = new DistanceHandler(
+                Context.getConfig().getBoolean("coordinates.filter"),
                 Context.getConfig().getInteger("coordinates.minError"),
                 Context.getConfig().getInteger("coordinates.maxError"));
 
+        if (Context.getConfig().getBoolean("processing.remoteAddress.enable")) {
+            remoteAddressHandler = new RemoteAddressHandler();
+        }
+
         if (Context.getConfig().getBoolean("filter.enable")) {
             filterHandler = new FilterHandler();
         }
@@ -145,7 +153,7 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
                     Context.getConfig().getBoolean("geolocation.processInvalidPositions"));
         }
 
-        motionHandler = new MotionHandler(Context.getConfig().getDouble("event.motion.speedThreshold", 0.01));
+        motionHandler = new MotionHandler(Context.getTripsConfig().getSpeedThreshold());
 
         if (Context.getConfig().hasKey("location.latitudeHemisphere")
                 || Context.getConfig().hasKey("location.longitudeHemisphere")) {
@@ -162,13 +170,14 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
 
         if (Context.getConfig().getBoolean("event.enable")) {
             commandResultEventHandler = new CommandResultEventHandler();
-            overspeedEventHandler = new OverspeedEventHandler();
+            overspeedEventHandler = Context.getOverspeedEventHandler();
             fuelDropEventHandler = new FuelDropEventHandler();
-            motionEventHandler = new MotionEventHandler();
+            motionEventHandler = Context.getMotionEventHandler();
             geofenceEventHandler = new GeofenceEventHandler();
             alertEventHandler = new AlertEventHandler();
             ignitionEventHandler = new IgnitionEventHandler();
             maintenanceEventHandler = new MaintenanceEventHandler();
+            driverEventHandler = new DriverEventHandler();
         }
     }
 
@@ -198,7 +207,9 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
             pipeline.addLast("distance", distanceHandler);
         }
 
-        pipeline.addLast("remoteAddress", new RemoteAddressHandler());
+        if (remoteAddressHandler != null) {
+            pipeline.addLast("remoteAddress", remoteAddressHandler);
+        }
 
         addDynamicHandlers(pipeline);
 
@@ -262,6 +273,10 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
             pipeline.addLast("MaintenanceEventHandler", maintenanceEventHandler);
         }
 
+        if (driverEventHandler != null) {
+            pipeline.addLast("DriverEventHandler", driverEventHandler);
+        }
+
         pipeline.addLast("mainHandler", new MainEventHandler());
         return pipeline;
     }
diff --git a/src/org/traccar/BaseProtocolDecoder.java b/src/org/traccar/BaseProtocolDecoder.java
index 54d2bf28f..2d6286bf8 100644
--- a/src/org/traccar/BaseProtocolDecoder.java
+++ b/src/org/traccar/BaseProtocolDecoder.java
@@ -17,7 +17,9 @@ package org.traccar;
 
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.socket.DatagramChannel;
+import org.jboss.netty.handler.codec.http.HttpRequestDecoder;
 import org.traccar.helper.Log;
+import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Device;
 import org.traccar.model.Position;
 
@@ -45,15 +47,13 @@ public abstract class BaseProtocolDecoder extends ExtendedObjectDecoder {
         }
 
         try {
-            Context.getDeviceManager().addDevice(device);
+            Context.getDeviceManager().addItem(device);
 
             Log.info("Automatically registered device " + uniqueId);
 
             if (defaultGroupId != 0) {
-                Context.getPermissionsManager().refreshPermissions();
-                if (Context.getGeofenceManager() != null) {
-                    Context.getGeofenceManager().refresh();
-                }
+                Context.getPermissionsManager().refreshDeviceAndGroupPermissions();
+                Context.getPermissionsManager().refreshAllExtendedPermissions();
             }
 
             return device.getId();
@@ -67,6 +67,20 @@ public abstract class BaseProtocolDecoder extends ExtendedObjectDecoder {
         return protocol.getName();
     }
 
+    protected double convertSpeed(double value, String defaultUnits) {
+        switch (Context.getConfig().getString(getProtocolName() + ".speed", defaultUnits)) {
+            case "kmh":
+                return UnitsConverter.knotsFromKph(value);
+            case "mps":
+                return UnitsConverter.knotsFromMps(value);
+            case "mph":
+                return UnitsConverter.knotsFromMph(value);
+            case "kn":
+            default:
+                return value;
+        }
+    }
+
     private DeviceSession channelDeviceSession; // connection-based protocols
     private Map<SocketAddress, DeviceSession> addressDeviceSessions = new HashMap<>(); // connectionless protocols
 
@@ -76,7 +90,7 @@ public abstract class BaseProtocolDecoder extends ExtendedObjectDecoder {
             try {
                 for (String uniqueId : uniqueIds) {
                     if (uniqueId != null) {
-                        Device device = Context.getIdentityManager().getDeviceByUniqueId(uniqueId);
+                        Device device = Context.getIdentityManager().getByUniqueId(uniqueId);
                         if (device != null) {
                             deviceId = device.getId();
                             break;
@@ -105,7 +119,8 @@ public abstract class BaseProtocolDecoder extends ExtendedObjectDecoder {
     }
 
     public DeviceSession getDeviceSession(Channel channel, SocketAddress remoteAddress, String... uniqueIds) {
-        if (Context.getConfig().getBoolean("decoder.ignoreSessionCache")) {
+        if (channel != null && channel.getPipeline().get(HttpRequestDecoder.class) != null
+                || Context.getConfig().getBoolean("decoder.ignoreSessionCache")) {
             long deviceId = findDeviceId(remoteAddress, uniqueIds);
             if (deviceId != 0) {
                 if (Context.getConnectionManager() != null) {
diff --git a/src/org/traccar/BaseProtocolEncoder.java b/src/org/traccar/BaseProtocolEncoder.java
index 3c2d08471..2c8a81868 100644
--- a/src/org/traccar/BaseProtocolEncoder.java
+++ b/src/org/traccar/BaseProtocolEncoder.java
@@ -25,12 +25,12 @@ import org.traccar.model.Device;
 public abstract class BaseProtocolEncoder extends OneToOneEncoder {
 
     protected String getUniqueId(long deviceId) {
-        return Context.getIdentityManager().getDeviceById(deviceId).getUniqueId();
+        return Context.getIdentityManager().getById(deviceId).getUniqueId();
     }
 
     protected void initDevicePassword(Command command, String defaultPassword) {
         if (!command.getAttributes().containsKey(Command.KEY_DEVICE_PASSWORD)) {
-            Device device = Context.getIdentityManager().getDeviceById(command.getDeviceId());
+            Device device = Context.getIdentityManager().getById(command.getDeviceId());
             String password = device.getString(Command.KEY_DEVICE_PASSWORD);
             if (password != null) {
                 command.set(Command.KEY_DEVICE_PASSWORD, password);
diff --git a/src/org/traccar/Config.java b/src/org/traccar/Config.java
index 0bc3cafaa..43f4632da 100644
--- a/src/org/traccar/Config.java
+++ b/src/org/traccar/Config.java
@@ -96,4 +96,8 @@ public class Config {
         return key.replaceAll("\\.", "_").replaceAll("(\\p{Lu})", "_$1").toUpperCase();
     }
 
+    public void setString(String key, String value) {
+        properties.put(key, value);
+    }
+
 }
diff --git a/src/org/traccar/Context.java b/src/org/traccar/Context.java
index 9626d949c..3b24c6460 100644
--- a/src/org/traccar/Context.java
+++ b/src/org/traccar/Context.java
@@ -25,18 +25,24 @@ import java.util.Properties;
 
 import org.apache.velocity.app.VelocityEngine;
 import org.eclipse.jetty.util.URIUtil;
-import org.traccar.database.AliasesManager;
 import org.traccar.database.CalendarManager;
+import org.traccar.database.CommandsManager;
 import org.traccar.database.AttributesManager;
+import org.traccar.database.BaseObjectManager;
 import org.traccar.database.ConnectionManager;
 import org.traccar.database.DataManager;
 import org.traccar.database.DeviceManager;
+import org.traccar.database.DriversManager;
 import org.traccar.database.IdentityManager;
 import org.traccar.database.MediaManager;
 import org.traccar.database.NotificationManager;
 import org.traccar.database.PermissionsManager;
 import org.traccar.database.GeofenceManager;
+import org.traccar.database.GroupsManager;
 import org.traccar.database.StatisticsManager;
+import org.traccar.database.UsersManager;
+import org.traccar.events.MotionEventHandler;
+import org.traccar.events.OverspeedEventHandler;
 import org.traccar.geocoder.BingMapsGeocoder;
 import org.traccar.geocoder.FactualGeocoder;
 import org.traccar.geocoder.GeocodeFarmGeocoder;
@@ -48,11 +54,22 @@ import org.traccar.geocoder.OpenCageGeocoder;
 import org.traccar.geocoder.Geocoder;
 import org.traccar.geolocation.UnwiredGeolocationProvider;
 import org.traccar.helper.Log;
+import org.traccar.model.Attribute;
+import org.traccar.model.BaseModel;
+import org.traccar.model.Calendar;
+import org.traccar.model.Command;
+import org.traccar.model.Device;
+import org.traccar.model.Driver;
+import org.traccar.model.Geofence;
+import org.traccar.model.Group;
+import org.traccar.model.Notification;
+import org.traccar.model.User;
 import org.traccar.geolocation.GoogleGeolocationProvider;
 import org.traccar.geolocation.GeolocationProvider;
 import org.traccar.geolocation.MozillaGeolocationProvider;
 import org.traccar.geolocation.OpenCellIdGeolocationProvider;
 import org.traccar.notification.EventForwarder;
+import org.traccar.reports.model.TripsConfig;
 import org.traccar.smpp.SmppClient;
 import org.traccar.web.WebServer;
 
@@ -97,6 +114,18 @@ public final class Context {
         return mediaManager;
     }
 
+    private static UsersManager usersManager;
+
+    public static UsersManager getUsersManager() {
+        return usersManager;
+    }
+
+    private static GroupsManager groupsManager;
+
+    public static GroupsManager getGroupsManager() {
+        return groupsManager;
+    }
+
     private static DeviceManager deviceManager;
 
     public static DeviceManager getDeviceManager() {
@@ -175,18 +204,24 @@ public final class Context {
         return eventForwarder;
     }
 
-    private static AliasesManager aliasesManager;
-
-    public static AliasesManager getAliasesManager() {
-        return aliasesManager;
-    }
-
     private static AttributesManager attributesManager;
 
     public static AttributesManager getAttributesManager() {
         return attributesManager;
     }
 
+    private static DriversManager driversManager;
+
+    public static DriversManager getDriversManager() {
+        return driversManager;
+    }
+
+    private static CommandsManager commandsManager;
+
+    public static CommandsManager getCommandsManager() {
+        return commandsManager;
+    }
+
     private static StatisticsManager statisticsManager;
 
     public static StatisticsManager getStatisticsManager() {
@@ -199,6 +234,35 @@ public final class Context {
         return smppClient;
     }
 
+    private static MotionEventHandler motionEventHandler;
+
+    public static MotionEventHandler getMotionEventHandler() {
+        return motionEventHandler;
+    }
+
+    private static OverspeedEventHandler overspeedEventHandler;
+
+    public static OverspeedEventHandler getOverspeedEventHandler() {
+        return overspeedEventHandler;
+    }
+
+    private static TripsConfig tripsConfig;
+
+    public static TripsConfig getTripsConfig() {
+        return tripsConfig;
+    }
+
+    public static TripsConfig initTripsConfig() {
+        return new TripsConfig(
+                config.getLong("report.trip.minimalTripDistance", 500),
+                config.getLong("report.trip.minimalTripDuration", 300) * 1000,
+                config.getLong("report.trip.minimalParkingDuration", 300) * 1000,
+                config.getLong("report.trip.minimalNoDataDuration", 3600) * 1000,
+                config.getBoolean("report.trip.useIgnition"),
+                config.getBoolean("event.motion.processInvalidPositions"),
+                config.getDouble("event.motion.speedThreshold", 0.01));
+    }
+
     public static void init(String[] arguments) throws Exception {
 
         config = new Config();
@@ -226,6 +290,8 @@ public final class Context {
         }
 
         if (dataManager != null) {
+            usersManager = new UsersManager(dataManager);
+            groupsManager = new GroupsManager(dataManager);
             deviceManager = new DeviceManager(dataManager);
         }
 
@@ -291,10 +357,12 @@ public final class Context {
             webServer = new WebServer(config, dataManager.getDataSource());
         }
 
-        permissionsManager = new PermissionsManager(dataManager);
+        permissionsManager = new PermissionsManager(dataManager, usersManager);
 
         connectionManager = new ConnectionManager();
 
+        tripsConfig = initTripsConfig();
+
         if (config.getBoolean("event.enable")) {
             geofenceManager = new GeofenceManager(dataManager);
             calendarManager = new CalendarManager(dataManager);
@@ -318,6 +386,11 @@ public final class Context {
 
             velocityEngine = new VelocityEngine();
             velocityEngine.init(velocityProperties);
+
+            motionEventHandler = new MotionEventHandler(tripsConfig);
+            overspeedEventHandler = new OverspeedEventHandler(
+                    Context.getConfig().getLong("event.overspeed.minimalDuration") * 1000,
+                    Context.getConfig().getBoolean("event.overspeed.notRepeat"));
         }
 
         serverManager = new ServerManager();
@@ -326,10 +399,12 @@ public final class Context {
             eventForwarder = new EventForwarder();
         }
 
-        aliasesManager = new AliasesManager(dataManager);
-
         attributesManager = new AttributesManager(dataManager);
 
+        driversManager = new DriversManager(dataManager);
+
+        commandsManager = new CommandsManager(dataManager);
+
         statisticsManager = new StatisticsManager();
 
         if (config.getBoolean("sms.smpp.enable")) {
@@ -344,4 +419,27 @@ public final class Context {
         identityManager = testIdentityManager;
     }
 
+    public static <T extends BaseModel> BaseObjectManager<T> getManager(Class<T> clazz) {
+        if (clazz.equals(Device.class)) {
+            return (BaseObjectManager<T>) deviceManager;
+        } else if (clazz.equals(Group.class)) {
+            return (BaseObjectManager<T>) groupsManager;
+        } else if (clazz.equals(User.class)) {
+            return (BaseObjectManager<T>) usersManager;
+        } else if (clazz.equals(Calendar.class)) {
+            return (BaseObjectManager<T>) calendarManager;
+        } else if (clazz.equals(Attribute.class)) {
+            return (BaseObjectManager<T>) attributesManager;
+        } else if (clazz.equals(Geofence.class)) {
+            return (BaseObjectManager<T>) geofenceManager;
+        } else if (clazz.equals(Driver.class)) {
+            return (BaseObjectManager<T>) driversManager;
+        } else if (clazz.equals(Command.class)) {
+            return (BaseObjectManager<T>) commandsManager;
+        } else if (clazz.equals(Notification.class)) {
+            return (BaseObjectManager<T>) notificationManager;
+        }
+        return null;
+    }
+
 }
diff --git a/src/org/traccar/FilterHandler.java b/src/org/traccar/FilterHandler.java
index 9e532347d..4cd3eb0eb 100644
--- a/src/org/traccar/FilterHandler.java
+++ b/src/org/traccar/FilterHandler.java
@@ -29,7 +29,8 @@ public class FilterHandler extends BaseDataHandler {
     private boolean filterStatic;
     private int filterDistance;
     private int filterMaxSpeed;
-    private long filterLimit;
+    private long skipLimit;
+    private boolean skipAttributes;
 
     public void setFilterInvalid(boolean filterInvalid) {
         this.filterInvalid = filterInvalid;
@@ -63,8 +64,12 @@ public class FilterHandler extends BaseDataHandler {
         this.filterMaxSpeed = filterMaxSpeed;
     }
 
-    public void setFilterLimit(long filterLimit) {
-        this.filterLimit = filterLimit;
+    public void setSkipLimit(long skipLimit) {
+        this.skipLimit = skipLimit;
+    }
+
+    public void setSkipAttributes(boolean skipAttributes) {
+        this.skipAttributes = skipAttributes;
     }
 
     public FilterHandler() {
@@ -78,7 +83,8 @@ public class FilterHandler extends BaseDataHandler {
             filterStatic = config.getBoolean("filter.static");
             filterDistance = config.getInteger("filter.distance");
             filterMaxSpeed = config.getInteger("filter.maxSpeed");
-            filterLimit = config.getLong("filter.limit") * 1000;
+            skipLimit = config.getLong("filter.skipLimit") * 1000;
+            skipAttributes = config.getBoolean("filter.skipAttributes.enable");
         }
     }
 
@@ -126,22 +132,30 @@ public class FilterHandler extends BaseDataHandler {
     private boolean filterMaxSpeed(Position position, Position last) {
         if (filterMaxSpeed != 0 && last != null) {
             double distance = position.getDouble(Position.KEY_DISTANCE);
-            long time = position.getFixTime().getTime() - last.getFixTime().getTime();
-            return UnitsConverter.knotsFromMps(distance / time) > filterMaxSpeed;
+            double time = position.getFixTime().getTime() - last.getFixTime().getTime();
+            return UnitsConverter.knotsFromMps(distance / (time / 1000)) > filterMaxSpeed;
+        }
+        return false;
+    }
+
+    private boolean skipLimit(Position position, Position last) {
+        if (skipLimit != 0 && last != null) {
+            return (position.getFixTime().getTime() - last.getFixTime().getTime()) > skipLimit;
         }
         return false;
     }
 
-    private boolean filterLimit(Position position, Position last) {
-        if (filterLimit != 0) {
-            if (last != null) {
-                return (position.getFixTime().getTime() - last.getFixTime().getTime()) > filterLimit;
-            } else {
-                return false;
+    private boolean skipAttributes(Position position) {
+        if (skipAttributes) {
+            String attributesString = Context.getIdentityManager().lookupAttributeString(
+                    position.getDeviceId(), "filter.skipAttributes", "", true);
+            for (String attribute : attributesString.split("[ ,]")) {
+                if (position.getAttributes().containsKey(attribute)) {
+                    return true;
+                }
             }
-        } else {
-            return false;
         }
+        return false;
     }
 
     private boolean filter(Position position) {
@@ -153,6 +167,10 @@ public class FilterHandler extends BaseDataHandler {
             last = Context.getIdentityManager().getLastPosition(position.getDeviceId());
         }
 
+        if (skipLimit(position, last) || skipAttributes(position)) {
+            return false;
+        }
+
         if (filterInvalid(position)) {
             filterType.append("Invalid ");
         }
@@ -178,13 +196,13 @@ public class FilterHandler extends BaseDataHandler {
             filterType.append("MaxSpeed ");
         }
 
-        if (filterType.length() > 0 && !filterLimit(position, last)) {
+        if (filterType.length() > 0) {
 
             StringBuilder message = new StringBuilder();
             message.append("Position filtered by ");
             message.append(filterType.toString());
             message.append("filters from device: ");
-            message.append(Context.getIdentityManager().getDeviceById(position.getDeviceId()).getUniqueId());
+            message.append(Context.getIdentityManager().getById(position.getDeviceId()).getUniqueId());
             message.append(" with id: ");
             message.append(position.getDeviceId());
 
diff --git a/src/org/traccar/MainEventHandler.java b/src/org/traccar/MainEventHandler.java
index a005ee44b..8e88e15b9 100644
--- a/src/org/traccar/MainEventHandler.java
+++ b/src/org/traccar/MainEventHandler.java
@@ -55,7 +55,7 @@ public class MainEventHandler extends IdleStateAwareChannelHandler {
                 Log.warning(error);
             }
 
-            String uniqueId = Context.getIdentityManager().getDeviceById(position.getDeviceId()).getUniqueId();
+            String uniqueId = Context.getIdentityManager().getById(position.getDeviceId()).getUniqueId();
 
             // Log position
             StringBuilder s = new StringBuilder();
diff --git a/src/org/traccar/WebDataHandler.java b/src/org/traccar/WebDataHandler.java
index eaf0978ef..c64dcc81b 100644
--- a/src/org/traccar/WebDataHandler.java
+++ b/src/org/traccar/WebDataHandler.java
@@ -75,7 +75,7 @@ public class WebDataHandler extends BaseDataHandler {
 
     public String formatRequest(Position position) {
 
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+        Device device = Context.getIdentityManager().getById(position.getDeviceId());
 
         String request = url
                 .replace("{name}", device.getName())
diff --git a/src/org/traccar/api/BaseObjectResource.java b/src/org/traccar/api/BaseObjectResource.java
new file mode 100644
index 000000000..634957a49
--- /dev/null
+++ b/src/org/traccar/api/BaseObjectResource.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.api;
+
+import java.sql.SQLException;
+import java.util.Set;
+
+import javax.ws.rs.DELETE;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.core.Response;
+
+import org.traccar.Context;
+import org.traccar.database.BaseObjectManager;
+import org.traccar.database.ExtendedObjectManager;
+import org.traccar.database.ManagableObjects;
+import org.traccar.database.SimpleObjectManager;
+import org.traccar.model.BaseModel;
+import org.traccar.model.Command;
+import org.traccar.model.Device;
+import org.traccar.model.Group;
+import org.traccar.model.User;
+
+public abstract class BaseObjectResource<T extends BaseModel> extends BaseResource {
+
+    private Class<T> baseClass;
+
+    public BaseObjectResource(Class<T> baseClass) {
+        this.baseClass = baseClass;
+    }
+
+    protected final Class<T> getBaseClass() {
+        return baseClass;
+    }
+
+    protected final Set<Long> getSimpleManagerItems(BaseObjectManager<T> manager, boolean all,  long userId) {
+        Set<Long> result = null;
+        if (all) {
+            if (Context.getPermissionsManager().getUserAdmin(getUserId())) {
+                result = manager.getAllItems();
+            } else {
+                Context.getPermissionsManager().checkManager(getUserId());
+                result = ((ManagableObjects) manager).getManagedItems(getUserId());
+            }
+        } else {
+            if (userId == 0) {
+                userId = getUserId();
+            }
+            Context.getPermissionsManager().checkUser(getUserId(), userId);
+            result = ((ManagableObjects) manager).getUserItems(userId);
+        }
+        return result;
+    }
+
+    @POST
+    public Response add(T entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        if (baseClass.equals(Device.class)) {
+            Context.getPermissionsManager().checkDeviceReadonly(getUserId());
+            Context.getPermissionsManager().checkDeviceLimit(getUserId());
+        } else if (baseClass.equals(Command.class)) {
+            Context.getPermissionsManager().checkLimitCommands(getUserId());
+        }
+
+        BaseObjectManager<T> manager = Context.getManager(baseClass);
+        manager.addItem(entity);
+
+        Context.getDataManager().linkObject(User.class, getUserId(), baseClass, entity.getId(), true);
+
+        if (manager instanceof SimpleObjectManager) {
+            ((SimpleObjectManager<T>) manager).refreshUserItems();
+        } else if (baseClass.equals(Group.class) || baseClass.equals(Device.class)) {
+            Context.getPermissionsManager().refreshDeviceAndGroupPermissions();
+            Context.getPermissionsManager().refreshAllExtendedPermissions();
+        }
+        return Response.ok(entity).build();
+    }
+
+    @Path("{id}")
+    @PUT
+    public Response update(T entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        if (baseClass.equals(Device.class)) {
+            Context.getPermissionsManager().checkDeviceReadonly(getUserId());
+        } else if (baseClass.equals(User.class)) {
+            User before = Context.getPermissionsManager().getUser(entity.getId());
+            Context.getPermissionsManager().checkUserUpdate(getUserId(), before, (User) entity);
+        } else if (baseClass.equals(Command.class)) {
+            Context.getPermissionsManager().checkLimitCommands(getUserId());
+        }
+        Context.getPermissionsManager().checkPermission(baseClass, getUserId(), entity.getId());
+
+        Context.getManager(baseClass).updateItem(entity);
+
+        if (baseClass.equals(Group.class) || baseClass.equals(Device.class)) {
+            Context.getPermissionsManager().refreshDeviceAndGroupPermissions();
+            Context.getPermissionsManager().refreshAllExtendedPermissions();
+        }
+        return Response.ok(entity).build();
+    }
+
+    @Path("{id}")
+    @DELETE
+    public Response remove(@PathParam("id") long id) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        if (baseClass.equals(Device.class)) {
+            Context.getPermissionsManager().checkDeviceReadonly(getUserId());
+        } else if (baseClass.equals(Command.class)) {
+            Context.getPermissionsManager().checkLimitCommands(getUserId());
+        }
+        Context.getPermissionsManager().checkPermission(baseClass, getUserId(), id);
+
+        BaseObjectManager<T> manager = Context.getManager(baseClass);
+        manager.removeItem(id);
+
+        if (manager instanceof SimpleObjectManager) {
+            ((SimpleObjectManager<T>) manager).refreshUserItems();
+            if (manager instanceof ExtendedObjectManager) {
+                ((ExtendedObjectManager<T>) manager).refreshExtendedPermissions();
+            }
+        }
+        if (baseClass.equals(Group.class) || baseClass.equals(Device.class) || baseClass.equals(User.class)) {
+            Context.getPermissionsManager().refreshDeviceAndGroupPermissions();
+            if (baseClass.equals(User.class)) {
+                Context.getPermissionsManager().refreshAllUsersPermissions();
+            } else {
+                Context.getPermissionsManager().refreshAllExtendedPermissions();
+            }
+        }
+        return Response.noContent().build();
+    }
+
+}
diff --git a/src/org/traccar/api/BaseResource.java b/src/org/traccar/api/BaseResource.java
index 44ef33c53..cc272df9c 100644
--- a/src/org/traccar/api/BaseResource.java
+++ b/src/org/traccar/api/BaseResource.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/src/org/traccar/api/ExtendedObjectResource.java b/src/org/traccar/api/ExtendedObjectResource.java
new file mode 100644
index 000000000..007a7b1bd
--- /dev/null
+++ b/src/org/traccar/api/ExtendedObjectResource.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.api;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.QueryParam;
+
+import org.traccar.Context;
+import org.traccar.database.ExtendedObjectManager;
+import org.traccar.model.BaseModel;
+
+public class ExtendedObjectResource<T extends BaseModel> extends BaseObjectResource<T> {
+
+    public ExtendedObjectResource(Class<T> baseClass) {
+        super(baseClass);
+    }
+
+    @GET
+    public Collection<T> get(
+            @QueryParam("all") boolean all, @QueryParam("userId") long userId, @QueryParam("groupId") long groupId,
+            @QueryParam("deviceId") long deviceId, @QueryParam("refresh") boolean refresh) throws SQLException {
+
+        ExtendedObjectManager<T> manager = (ExtendedObjectManager<T>) Context.getManager(getBaseClass());
+        if (refresh) {
+            manager.refreshItems();
+        }
+
+        Set<Long> result = new HashSet<>(getSimpleManagerItems(manager, all, userId));
+
+        if (groupId != 0) {
+            Context.getPermissionsManager().checkGroup(getUserId(), groupId);
+            result.retainAll(manager.getGroupItems(groupId));
+        }
+
+        if (deviceId != 0) {
+            Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
+            result.retainAll(manager.getDeviceItems(deviceId));
+        }
+        return manager.getItems(result);
+
+    }
+
+}
diff --git a/src/org/traccar/api/resource/CommandTypeResource.java b/src/org/traccar/api/SimpleObjectResource.java
index d5d220547..a7fcae0e7 100644
--- a/src/org/traccar/api/resource/CommandTypeResource.java
+++ b/src/org/traccar/api/SimpleObjectResource.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Gabor Somogyi (gabor.g.somogyi@gmail.com)
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
  * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -14,30 +14,30 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.traccar.api.resource;
+package org.traccar.api;
 
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.CommandType;
+import java.sql.SQLException;
+import java.util.Collection;
 
-import javax.ws.rs.Consumes;
 import javax.ws.rs.GET;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
-import javax.ws.rs.core.MediaType;
-import java.util.Collection;
 
-@Path("commandtypes")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class CommandTypeResource extends BaseResource {
+import org.traccar.Context;
+import org.traccar.database.BaseObjectManager;
+import org.traccar.model.BaseModel;
+
+public class SimpleObjectResource<T extends BaseModel> extends BaseObjectResource<T> {
+
+    public SimpleObjectResource(Class<T> baseClass) {
+        super(baseClass);
+    }
 
     @GET
-    public Collection<CommandType> get(@QueryParam("deviceId") long deviceId,
-            @QueryParam("textChannel") boolean textChannel) {
-        Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-        return Context.getDeviceManager().getCommandTypes(deviceId, textChannel);
+    public Collection<T> get(
+            @QueryParam("all") boolean all, @QueryParam("userId") long userId) throws SQLException {
+
+        BaseObjectManager<T> manager = Context.getManager(getBaseClass());
+        return manager.getItems(getSimpleManagerItems(manager, all, userId));
     }
 
 }
diff --git a/src/org/traccar/api/resource/AttributeAliasResource.java b/src/org/traccar/api/resource/AttributeAliasResource.java
deleted file mode 100644
index b2636acf1..000000000
--- a/src/org/traccar/api/resource/AttributeAliasResource.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import java.sql.SQLException;
-import java.util.Collection;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
-import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
-import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
-import javax.ws.rs.Produces;
-import javax.ws.rs.QueryParam;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.AttributeAlias;
-
-@Path("attributes/aliases")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class AttributeAliasResource extends BaseResource {
-
-    @GET
-    public Collection<AttributeAlias> get(@QueryParam("deviceId") long deviceId) throws SQLException {
-        if (deviceId != 0) {
-            if (!Context.getPermissionsManager().isAdmin(getUserId())) {
-                Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-            }
-            return Context.getAliasesManager().getAttributeAliases(deviceId);
-        } else {
-            return Context.getAliasesManager().getAllAttributeAliases(getUserId());
-        }
-    }
-
-    @POST
-    public Response add(AttributeAlias entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceReadonly(getUserId());
-        if (!Context.getPermissionsManager().isAdmin(getUserId())) {
-            Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        }
-        Context.getAliasesManager().addAttributeAlias(entity);
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @PUT
-    public Response update(AttributeAlias entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceReadonly(getUserId());
-        if (!Context.getPermissionsManager().isAdmin(getUserId())) {
-            AttributeAlias oldEntity = Context.getAliasesManager().getAttributeAlias(entity.getId());
-            Context.getPermissionsManager().checkDevice(getUserId(), oldEntity.getDeviceId());
-            Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        }
-        Context.getAliasesManager().updateAttributeAlias(entity);
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceReadonly(getUserId());
-        if (!Context.getPermissionsManager().isAdmin(getUserId())) {
-            AttributeAlias entity = Context.getAliasesManager().getAttributeAlias(id);
-            Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        }
-        Context.getAliasesManager().removeArrtibuteAlias(id);
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/AttributePermissionResource.java b/src/org/traccar/api/resource/AttributePermissionResource.java
deleted file mode 100644
index 1924bcdf1..000000000
--- a/src/org/traccar/api/resource/AttributePermissionResource.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright 2017 Anton Tananaev (anton@traccar.org)
- * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import java.sql.SQLException;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.AttributePermission;
-
-@Path("permissions/attributes")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class AttributePermissionResource extends BaseResource {
-
-    @POST
-    public Response add(AttributePermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
-        Context.getDataManager().linkAttribute(entity.getUserId(), entity.getAttributeId());
-        Context.getAttributesManager().refreshUserAttributes();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(AttributePermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
-        Context.getDataManager().unlinkAttribute(entity.getUserId(), entity.getAttributeId());
-        Context.getAttributesManager().refreshUserAttributes();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/AttributeResource.java b/src/org/traccar/api/resource/AttributeResource.java
index 4d326779b..26a1f6931 100644
--- a/src/org/traccar/api/resource/AttributeResource.java
+++ b/src/org/traccar/api/resource/AttributeResource.java
@@ -17,25 +17,17 @@
 package org.traccar.api.resource;
 
 import java.sql.SQLException;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Set;
 
 import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
 import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.database.AttributesManager;
+import org.traccar.api.ExtendedObjectResource;
 import org.traccar.model.Attribute;
 import org.traccar.model.Position;
 import org.traccar.processing.ComputedAttributesHandler;
@@ -43,55 +35,17 @@ import org.traccar.processing.ComputedAttributesHandler;
 @Path("attributes/computed")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class AttributeResource extends BaseResource {
+public class AttributeResource extends ExtendedObjectResource<Attribute> {
 
-    @GET
-    public Collection<Attribute> get(
-            @QueryParam("all") boolean all, @QueryParam("userId") long userId, @QueryParam("groupId") long groupId,
-            @QueryParam("deviceId") long deviceId, @QueryParam("refresh") boolean refresh) throws SQLException {
-
-        AttributesManager attributesManager = Context.getAttributesManager();
-        if (refresh) {
-            attributesManager.refreshAttributes();
-        }
-
-        Set<Long> result = new HashSet<>();
-        if (all) {
-            if (Context.getPermissionsManager().isAdmin(getUserId())) {
-                result.addAll(attributesManager.getAllAttributes());
-            } else {
-                Context.getPermissionsManager().checkManager(getUserId());
-                result.addAll(attributesManager.getManagedAttributes(getUserId()));
-            }
-        } else {
-            if (userId == 0) {
-                userId = getUserId();
-            }
-            Context.getPermissionsManager().checkUser(getUserId(), userId);
-            result.addAll(attributesManager.getUserAttributes(userId));
-        }
-
-        if (groupId != 0) {
-            Context.getPermissionsManager().checkGroup(getUserId(), groupId);
-            result.retainAll(attributesManager.getGroupAttributes(groupId));
-        }
-
-        if (deviceId != 0) {
-            Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-            result.retainAll(attributesManager.getDeviceAttributes(deviceId));
-        }
-        return attributesManager.getAttributes(result);
-
-    }
-
-    private Response add(Attribute entity) throws SQLException {
-        Context.getAttributesManager().addAttribute(entity);
-        Context.getDataManager().linkAttribute(getUserId(), entity.getId());
-        Context.getAttributesManager().refreshUserAttributes();
-        return Response.ok(entity).build();
+    public AttributeResource() {
+        super(Attribute.class);
     }
 
-    private Response test(long deviceId, Attribute entity) {
+    @POST
+    @Path("test")
+    public Response test(@QueryParam("deviceId") long deviceId, Attribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
         Position last = Context.getIdentityManager().getLastPosition(deviceId);
         if (last != null) {
             Object result = new ComputedAttributesHandler().computeAttribute(entity, last);
@@ -112,33 +66,4 @@ public class AttributeResource extends BaseResource {
         }
     }
 
-    @POST
-    public Response post(@QueryParam("deviceId") long deviceId, Attribute entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        if (deviceId != 0) {
-            Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-            return test(deviceId, entity);
-        } else {
-            return add(entity);
-        }
-    }
-
-    @Path("{id}")
-    @PUT
-    public Response update(Attribute entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getId());
-        Context.getAttributesManager().updateAttribute(entity);
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkAttribute(getUserId(), id);
-        Context.getAttributesManager().removeAttribute(id);
-        return Response.noContent().build();
-    }
-
 }
diff --git a/src/org/traccar/api/resource/CalendarPermissionResource.java b/src/org/traccar/api/resource/CalendarPermissionResource.java
deleted file mode 100644
index a49254b6b..000000000
--- a/src/org/traccar/api/resource/CalendarPermissionResource.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import java.sql.SQLException;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.CalendarPermission;
-
-@Path("permissions/calendars")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class CalendarPermissionResource extends BaseResource {
-
-    @POST
-    public Response add(CalendarPermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkCalendar(getUserId(), entity.getCalendarId());
-        Context.getDataManager().linkCalendar(entity.getUserId(), entity.getCalendarId());
-        Context.getCalendarManager().refreshUserCalendars();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(CalendarPermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkCalendar(getUserId(), entity.getCalendarId());
-        Context.getDataManager().unlinkCalendar(entity.getUserId(), entity.getCalendarId());
-        Context.getCalendarManager().refreshUserCalendars();
-        return Response.noContent().build();
-    }
-}
diff --git a/src/org/traccar/api/resource/CalendarResource.java b/src/org/traccar/api/resource/CalendarResource.java
index 641d3b4b5..9399c34a5 100644
--- a/src/org/traccar/api/resource/CalendarResource.java
+++ b/src/org/traccar/api/resource/CalendarResource.java
@@ -16,74 +16,21 @@
  */
 package org.traccar.api.resource;
 
-import java.sql.SQLException;
-import java.util.Collection;
-
 import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
-import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
-import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
 
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
+import org.traccar.api.SimpleObjectResource;
 import org.traccar.model.Calendar;
 
 @Path("calendars")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class CalendarResource extends BaseResource {
-
-    @GET
-    public Collection<Calendar> get(
-            @QueryParam("all") boolean all, @QueryParam("userId") long userId) throws SQLException {
-
-        if (all) {
-            if (Context.getPermissionsManager().isAdmin(getUserId())) {
-                return Context.getCalendarManager().getAllCalendars();
-            } else {
-                Context.getPermissionsManager().checkManager(getUserId());
-                return Context.getCalendarManager().getManagedCalendars(getUserId());
-            }
-        } else {
-            if (userId == 0) {
-                userId = getUserId();
-            }
-            Context.getPermissionsManager().checkUser(getUserId(), userId);
-            return Context.getCalendarManager().getUserCalendars(userId);
-        }
-    }
+public class CalendarResource extends SimpleObjectResource<Calendar> {
 
-    @POST
-    public Response add(Calendar entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getCalendarManager().addCalendar(entity);
-        Context.getDataManager().linkCalendar(getUserId(), entity.getId());
-        Context.getCalendarManager().refreshUserCalendars();
-        return Response.ok(entity).build();
+    public CalendarResource() {
+        super(Calendar.class);
     }
 
-    @Path("{id}")
-    @PUT
-    public Response update(Calendar entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkCalendar(getUserId(), entity.getId());
-        Context.getCalendarManager().updateCalendar(entity);
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkCalendar(getUserId(), id);
-        Context.getCalendarManager().removeCalendar(id);
-        return Response.noContent().build();
-    }
 }
diff --git a/src/org/traccar/api/resource/CommandResource.java b/src/org/traccar/api/resource/CommandResource.java
index 9ed92d3d5..703638701 100644
--- a/src/org/traccar/api/resource/CommandResource.java
+++ b/src/org/traccar/api/resource/CommandResource.java
@@ -1,5 +1,7 @@
 /*
  * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 Gabor Somogyi (gabor.g.somogyi@gmail.com)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,27 +18,72 @@
 package org.traccar.api.resource;
 
 import org.traccar.Context;
-import org.traccar.api.BaseResource;
+import org.traccar.api.ExtendedObjectResource;
+import org.traccar.database.CommandsManager;
 import org.traccar.model.Command;
+import org.traccar.model.Typed;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
 
 import javax.ws.rs.Consumes;
+import javax.ws.rs.GET;
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
+import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 @Path("commands")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class CommandResource extends BaseResource {
+public class CommandResource extends ExtendedObjectResource<Command> {
+
+    public CommandResource() {
+        super(Command.class);
+    }
+
+    @GET
+    @Path("send")
+    public Collection<Command> get(@QueryParam("deviceId") long deviceId) throws SQLException {
+        Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
+        CommandsManager commandsManager = Context.getCommandsManager();
+        Set<Long> result = new HashSet<>(commandsManager.getUserItems(getUserId()));
+        result.retainAll(commandsManager.getSupportedCommands(deviceId));
+        return commandsManager.getItems(result);
+    }
 
     @POST
-    public Response add(Command entity) throws Exception {
+    @Path("send")
+    public Response send(Command entity) throws Exception {
         Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getDeviceManager().sendCommand(entity);
+        long deviceId = entity.getDeviceId();
+        long id = entity.getId();
+        Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
+        if (id != 0) {
+            Context.getPermissionsManager().checkPermission(Command.class, getUserId(), id);
+            Context.getPermissionsManager().checkUserDeviceCommand(getUserId(), deviceId, id);
+        } else {
+            Context.getPermissionsManager().checkLimitCommands(getUserId());
+        }
+        if (!Context.getCommandsManager().sendCommand(entity)) {
+            return Response.accepted(entity).build();
+        }
         return Response.ok(entity).build();
     }
 
+    @GET
+    @Path("types")
+    public Collection<Typed> get(@QueryParam("deviceId") long deviceId,
+            @QueryParam("textChannel") boolean textChannel) {
+        if (deviceId != 0) {
+            Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
+            return Context.getCommandsManager().getCommandTypes(deviceId, textChannel);
+        } else {
+            return Context.getCommandsManager().getAllCommandTypes();
+        }
+    }
 }
diff --git a/src/org/traccar/api/resource/DeviceAttributeResource.java b/src/org/traccar/api/resource/DeviceAttributeResource.java
deleted file mode 100644
index 8d80c9235..000000000
--- a/src/org/traccar/api/resource/DeviceAttributeResource.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright 2017 Anton Tananaev (anton@traccar.org)
- * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import java.sql.SQLException;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.DeviceAttribute;
-
-@Path("devices/attributes")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class DeviceAttributeResource extends BaseResource {
-
-    @POST
-    public Response add(DeviceAttribute entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
-        Context.getDataManager().linkDeviceAttribute(entity.getDeviceId(), entity.getAttributeId());
-        Context.getAttributesManager().refresh();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(DeviceAttribute entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getAttributeId());
-        Context.getDataManager().unlinkDeviceAttribute(entity.getDeviceId(), entity.getAttributeId());
-        Context.getAttributesManager().refresh();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/DeviceGeofenceResource.java b/src/org/traccar/api/resource/DeviceGeofenceResource.java
deleted file mode 100644
index 6254fe3cf..000000000
--- a/src/org/traccar/api/resource/DeviceGeofenceResource.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.DeviceGeofence;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import java.sql.SQLException;
-
-@Path("devices/geofences")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class DeviceGeofenceResource extends BaseResource {
-
-    @POST
-    public Response add(DeviceGeofence entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getGeofenceId());
-        Context.getDataManager().linkDeviceGeofence(entity.getDeviceId(), entity.getGeofenceId());
-        Context.getGeofenceManager().refresh();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(DeviceGeofence entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getGeofenceId());
-        Context.getDataManager().unlinkDeviceGeofence(entity.getDeviceId(), entity.getGeofenceId());
-        Context.getGeofenceManager().refresh();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/DevicePermissionResource.java b/src/org/traccar/api/resource/DevicePermissionResource.java
deleted file mode 100644
index 6e00dc47f..000000000
--- a/src/org/traccar/api/resource/DevicePermissionResource.java
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.DevicePermission;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import java.sql.SQLException;
-
-@Path("permissions/devices")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class DevicePermissionResource extends BaseResource {
-
-    @POST
-    public Response add(DevicePermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getDataManager().linkDevice(entity.getUserId(), entity.getDeviceId());
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(DevicePermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        if (getUserId() != entity.getUserId()) {
-            Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        } else {
-            Context.getPermissionsManager().checkAdmin(getUserId());
-        }
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
-        Context.getDataManager().unlinkDevice(entity.getUserId(), entity.getDeviceId());
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/DeviceResource.java b/src/org/traccar/api/resource/DeviceResource.java
index ce46b4e29..1fae92dc7 100644
--- a/src/org/traccar/api/resource/DeviceResource.java
+++ b/src/org/traccar/api/resource/DeviceResource.java
@@ -16,102 +16,68 @@
 package org.traccar.api.resource;
 
 import org.traccar.Context;
-import org.traccar.api.BaseResource;
+import org.traccar.api.BaseObjectResource;
+import org.traccar.database.DeviceManager;
 import org.traccar.model.Device;
 import org.traccar.model.DeviceTotalDistance;
 
 import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
-import javax.ws.rs.POST;
 import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 import java.sql.SQLException;
-import java.util.ArrayList;
 import java.util.Collection;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 @Path("devices")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class DeviceResource extends BaseResource {
+public class DeviceResource extends BaseObjectResource<Device> {
+
+    public DeviceResource() {
+        super(Device.class);
+    }
 
     @GET
     public Collection<Device> get(
             @QueryParam("all") boolean all, @QueryParam("userId") long userId,
+            @QueryParam("uniqueId") List<String> uniqueIds,
             @QueryParam("id") List<Long> deviceIds) throws SQLException {
-        if (deviceIds.isEmpty()) {
-            if (all) {
-                if (Context.getPermissionsManager().isAdmin(getUserId())) {
-                    return Context.getDeviceManager().getAllDevices();
-                } else {
-                    Context.getPermissionsManager().checkManager(getUserId());
-                    return Context.getDeviceManager().getManagedDevices(getUserId());
-                }
+        DeviceManager deviceManager = Context.getDeviceManager();
+        Set<Long> result = null;
+        if (all) {
+            if (Context.getPermissionsManager().getUserAdmin(getUserId())) {
+                result = deviceManager.getAllItems();
             } else {
-                if (userId == 0) {
-                    userId = getUserId();
-                }
-                Context.getPermissionsManager().checkUser(getUserId(), userId);
-                return Context.getDeviceManager().getDevices(userId);
+                Context.getPermissionsManager().checkManager(getUserId());
+                result = deviceManager.getManagedItems(getUserId());
             }
+        } else if (uniqueIds.isEmpty() && deviceIds.isEmpty()) {
+            if (userId == 0) {
+                userId = getUserId();
+            }
+            Context.getPermissionsManager().checkUser(getUserId(), userId);
+            result = deviceManager.getUserItems(userId);
         } else {
-            ArrayList<Device> devices = new ArrayList<>();
+            result = new HashSet<Long>();
+            for (String uniqueId : uniqueIds) {
+                Device device = deviceManager.getByUniqueId(uniqueId);
+                Context.getPermissionsManager().checkDevice(getUserId(), device.getId());
+                result.add(device.getId());
+            }
             for (Long deviceId : deviceIds) {
                 Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-                devices.add(Context.getDeviceManager().getDeviceById(deviceId));
+                result.add(deviceId);
             }
-            return devices;
         }
-    }
-
-    @POST
-    public Response add(Device entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceLimit(getUserId());
-        Context.getDeviceManager().addDevice(entity);
-        Context.getDataManager().linkDevice(getUserId(), entity.getId());
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @PUT
-    public Response update(Device entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), entity.getId());
-        Context.getDeviceManager().updateDevice(entity);
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkDeviceReadonly(getUserId());
-        Context.getPermissionsManager().checkDevice(getUserId(), id);
-        Context.getDeviceManager().removeDevice(id);
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        Context.getAliasesManager().removeDevice(id);
-        return Response.noContent().build();
+        return deviceManager.getItems(result);
     }
 
     @Path("{id}/distance")
diff --git a/src/org/traccar/api/resource/DriverResource.java b/src/org/traccar/api/resource/DriverResource.java
new file mode 100644
index 000000000..91aa54c5e
--- /dev/null
+++ b/src/org/traccar/api/resource/DriverResource.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.api.resource;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+
+import org.traccar.api.ExtendedObjectResource;
+import org.traccar.model.Driver;
+
+@Path("drivers")
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class DriverResource extends ExtendedObjectResource<Driver> {
+
+    public DriverResource() {
+        super(Driver.class);
+    }
+
+}
diff --git a/src/org/traccar/api/resource/EventResource.java b/src/org/traccar/api/resource/EventResource.java
index 0ef5456af..a7cf9edbd 100644
--- a/src/org/traccar/api/resource/EventResource.java
+++ b/src/org/traccar/api/resource/EventResource.java
@@ -12,6 +12,7 @@ import javax.ws.rs.core.MediaType;
 import org.traccar.Context;
 import org.traccar.api.BaseResource;
 import org.traccar.model.Event;
+import org.traccar.model.Geofence;
 
 @Path("events")
 @Produces(MediaType.APPLICATION_JSON)
@@ -22,10 +23,10 @@ public class EventResource extends BaseResource {
     @Path("{id}")
     @GET
     public Event get(@PathParam("id") long id) throws SQLException {
-        Event event = Context.getDataManager().getEvent(id);
+        Event event = Context.getDataManager().getObject(Event.class, id);
         Context.getPermissionsManager().checkDevice(getUserId(), event.getDeviceId());
         if (event.getGeofenceId() != 0) {
-            Context.getPermissionsManager().checkGeofence(getUserId(), event.getGeofenceId());
+            Context.getPermissionsManager().checkPermission(Geofence.class, getUserId(), event.getGeofenceId());
         }
         return event;
     }
diff --git a/src/org/traccar/api/resource/GeofencePermissionResource.java b/src/org/traccar/api/resource/GeofencePermissionResource.java
deleted file mode 100644
index 8faa63d85..000000000
--- a/src/org/traccar/api/resource/GeofencePermissionResource.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.GeofencePermission;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import java.sql.SQLException;
-
-@Path("permissions/geofences")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class GeofencePermissionResource extends BaseResource {
-
-    @POST
-    public Response add(GeofencePermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getGeofenceId());
-        Context.getDataManager().linkGeofence(entity.getUserId(), entity.getGeofenceId());
-        Context.getGeofenceManager().refreshUserGeofences();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(GeofencePermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getGeofenceId());
-        Context.getDataManager().unlinkGeofence(entity.getUserId(), entity.getGeofenceId());
-        Context.getGeofenceManager().refreshUserGeofences();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/GeofenceResource.java b/src/org/traccar/api/resource/GeofenceResource.java
index d5acf106a..58f2c188c 100644
--- a/src/org/traccar/api/resource/GeofenceResource.java
+++ b/src/org/traccar/api/resource/GeofenceResource.java
@@ -15,98 +15,21 @@
  */
 package org.traccar.api.resource;
 
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.database.GeofenceManager;
+import org.traccar.api.ExtendedObjectResource;
 import org.traccar.model.Geofence;
 
 import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
-import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
-import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import java.sql.SQLException;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Set;
 
 @Path("geofences")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class GeofenceResource extends BaseResource {
-
-    @GET
-    public Collection<Geofence> get(
-            @QueryParam("all") boolean all, @QueryParam("userId") long userId, @QueryParam("groupId") long groupId,
-            @QueryParam("deviceId") long deviceId, @QueryParam("refresh") boolean refresh) throws SQLException {
-
-        GeofenceManager geofenceManager = Context.getGeofenceManager();
-        if (refresh) {
-            geofenceManager.refreshGeofences();
-        }
-
-        Set<Long> result = new HashSet<>();
-        if (all) {
-            if (Context.getPermissionsManager().isAdmin(getUserId())) {
-                result.addAll(geofenceManager.getAllGeofencesIds());
-            } else {
-                Context.getPermissionsManager().checkManager(getUserId());
-                result.addAll(geofenceManager.getManagedGeofencesIds(getUserId()));
-            }
-        } else {
-            if (userId == 0) {
-                userId = getUserId();
-            }
-            Context.getPermissionsManager().checkUser(getUserId(), userId);
-            result.addAll(geofenceManager.getUserGeofencesIds(userId));
-        }
-
-        if (groupId != 0) {
-            Context.getPermissionsManager().checkGroup(getUserId(), groupId);
-            result.retainAll(geofenceManager.getGroupGeofencesIds(groupId));
-        }
-
-        if (deviceId != 0) {
-            Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-            result.retainAll(geofenceManager.getDeviceGeofencesIds(deviceId));
-        }
-        return geofenceManager.getGeofences(result);
-
-    }
-
-    @POST
-    public Response add(Geofence entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getDataManager().addGeofence(entity);
-        Context.getDataManager().linkGeofence(getUserId(), entity.getId());
-        Context.getGeofenceManager().refreshGeofences();
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @PUT
-    public Response update(Geofence entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getId());
-        Context.getGeofenceManager().updateGeofence(entity);
-        return Response.ok(entity).build();
-    }
+public class GeofenceResource extends ExtendedObjectResource<Geofence> {
 
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), id);
-        Context.getDataManager().removeGeofence(id);
-        Context.getGeofenceManager().refreshGeofences();
-        return Response.noContent().build();
+    public GeofenceResource() {
+        super(Geofence.class);
     }
 
 }
diff --git a/src/org/traccar/api/resource/GroupAttributeResource.java b/src/org/traccar/api/resource/GroupAttributeResource.java
deleted file mode 100644
index 84b876d34..000000000
--- a/src/org/traccar/api/resource/GroupAttributeResource.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright 2017 Anton Tananaev (anton@traccar.org)
- * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import java.sql.SQLException;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.GroupAttribute;
-
-@Path("groups/attributes")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class GroupAttributeResource extends BaseResource {
-
-    @POST
-    public Response add(GroupAttribute entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
-        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
-        Context.getDataManager().linkGroupAttribute(entity.getGroupId(), entity.getAttributeId());
-        Context.getAttributesManager().refresh();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(GroupAttribute entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getAttributeId());
-        Context.getDataManager().unlinkGroupAttribute(entity.getGroupId(), entity.getAttributeId());
-        Context.getAttributesManager().refresh();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/GroupGeofenceResource.java b/src/org/traccar/api/resource/GroupGeofenceResource.java
deleted file mode 100644
index 81fd4e45f..000000000
--- a/src/org/traccar/api/resource/GroupGeofenceResource.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.GroupGeofence;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import java.sql.SQLException;
-
-@Path("groups/geofences")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class GroupGeofenceResource extends BaseResource {
-
-    @POST
-    public Response add(GroupGeofence entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getGeofenceId());
-        Context.getDataManager().linkGroupGeofence(entity.getGroupId(), entity.getGeofenceId());
-        Context.getGeofenceManager().refresh();
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(GroupGeofence entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
-        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getGeofenceId());
-        Context.getDataManager().unlinkGroupGeofence(entity.getGroupId(), entity.getGeofenceId());
-        Context.getGeofenceManager().refresh();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/GroupPermissionResource.java b/src/org/traccar/api/resource/GroupPermissionResource.java
deleted file mode 100644
index 61a725222..000000000
--- a/src/org/traccar/api/resource/GroupPermissionResource.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.GroupPermission;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import java.sql.SQLException;
-
-@Path("permissions/groups")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class GroupPermissionResource extends BaseResource {
-
-    @POST
-    public Response add(GroupPermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
-        Context.getDataManager().linkGroup(entity.getUserId(), entity.getGroupId());
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(GroupPermission entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
-        Context.getDataManager().unlinkGroup(entity.getUserId(), entity.getGroupId());
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/GroupResource.java b/src/org/traccar/api/resource/GroupResource.java
index ceba69105..fcea15d0a 100644
--- a/src/org/traccar/api/resource/GroupResource.java
+++ b/src/org/traccar/api/resource/GroupResource.java
@@ -15,83 +15,21 @@
  */
 package org.traccar.api.resource;
 
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
+import org.traccar.api.SimpleObjectResource;
 import org.traccar.model.Group;
 
 import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.GET;
-import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
-import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import java.sql.SQLException;
-import java.util.Collection;
 
 @Path("groups")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class GroupResource extends BaseResource {
+public class GroupResource extends SimpleObjectResource<Group> {
 
-    @GET
-    public Collection<Group> get(
-            @QueryParam("all") boolean all, @QueryParam("userId") long userId) throws SQLException {
-        if (all) {
-            if (Context.getPermissionsManager().isAdmin(getUserId())) {
-                return Context.getDeviceManager().getAllGroups();
-            } else {
-                Context.getPermissionsManager().checkManager(getUserId());
-                return Context.getDeviceManager().getManagedGroups(getUserId());
-            }
-        } else {
-            if (userId == 0) {
-                userId = getUserId();
-            }
-            Context.getPermissionsManager().checkUser(getUserId(), userId);
-            return Context.getDeviceManager().getGroups(userId);
-        }
-    }
-
-    @POST
-    public Response add(Group entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getDeviceManager().addGroup(entity);
-        Context.getDataManager().linkGroup(getUserId(), entity.getId());
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @PUT
-    public Response update(Group entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), entity.getId());
-        Context.getDeviceManager().updateGroup(entity);
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkGroup(getUserId(), id);
-        Context.getDeviceManager().removeGroup(id);
-        Context.getPermissionsManager().refreshPermissions();
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refresh();
-        }
-        return Response.noContent().build();
+    public GroupResource() {
+        super(Group.class);
     }
 
 }
diff --git a/src/org/traccar/api/resource/NotificationResource.java b/src/org/traccar/api/resource/NotificationResource.java
index dee972607..540f02926 100644
--- a/src/org/traccar/api/resource/NotificationResource.java
+++ b/src/org/traccar/api/resource/NotificationResource.java
@@ -15,7 +15,6 @@
  */
 package org.traccar.api.resource;
 
-import java.sql.SQLException;
 import java.util.Collection;
 
 import javax.mail.MessagingException;
@@ -24,14 +23,14 @@ import javax.ws.rs.GET;
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
-import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 import org.traccar.Context;
-import org.traccar.api.BaseResource;
+import org.traccar.api.ExtendedObjectResource;
 import org.traccar.model.Event;
 import org.traccar.model.Notification;
+import org.traccar.model.Typed;
 import org.traccar.notification.NotificationMail;
 import org.traccar.notification.NotificationSms;
 
@@ -40,34 +39,23 @@ import com.cloudhopper.smpp.type.SmppChannelException;
 import com.cloudhopper.smpp.type.SmppTimeoutException;
 import com.cloudhopper.smpp.type.UnrecoverablePduException;
 
-@Path("users/notifications")
+@Path("notifications")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class NotificationResource extends BaseResource {
+public class NotificationResource extends ExtendedObjectResource<Notification> {
 
-    @GET
-    public Collection<Notification> get(@QueryParam("all") boolean all,
-            @QueryParam("userId") long userId) throws SQLException {
-        if (all) {
-            return Context.getNotificationManager().getAllNotifications();
-        }
-        if (userId == 0) {
-            userId = getUserId();
-        }
-        Context.getPermissionsManager().checkUser(getUserId(), userId);
-        return Context.getNotificationManager().getAllUserNotifications(userId);
+    public NotificationResource() {
+        super(Notification.class);
     }
 
-    @POST
-    public Response update(Notification entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
-        Context.getNotificationManager().updateNotification(entity);
-        return Response.ok(entity).build();
+    @GET
+    @Path("types")
+    public Collection<Typed> get() {
+        return Context.getNotificationManager().getAllNotificationTypes();
     }
 
-    @Path("test")
     @POST
+    @Path("test")
     public Response testMessage() throws MessagingException, RecoverablePduException,
             UnrecoverablePduException, SmppTimeoutException, SmppChannelException, InterruptedException {
         NotificationMail.sendMailSync(getUserId(), new Event("test", 0), null);
diff --git a/src/org/traccar/api/resource/PermissionsResource.java b/src/org/traccar/api/resource/PermissionsResource.java
new file mode 100644
index 000000000..9b9f65ad1
--- /dev/null
+++ b/src/org/traccar/api/resource/PermissionsResource.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.api.resource;
+
+import java.sql.SQLException;
+import java.util.LinkedHashMap;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+import org.traccar.Context;
+import org.traccar.api.BaseResource;
+import org.traccar.model.Device;
+import org.traccar.model.Permission;
+import org.traccar.model.User;
+
+@Path("permissions")
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class PermissionsResource  extends BaseResource {
+
+    private void checkPermission(Permission permission, boolean link) {
+        if (!link && permission.getOwnerClass().equals(User.class)
+                && permission.getPropertyClass().equals(Device.class)) {
+            if (getUserId() != permission.getOwnerId()) {
+                Context.getPermissionsManager().checkUser(getUserId(), permission.getOwnerId());
+            } else {
+                Context.getPermissionsManager().checkAdmin(getUserId());
+            }
+        } else {
+            Context.getPermissionsManager().checkPermission(
+                    permission.getOwnerClass(), getUserId(), permission.getOwnerId());
+        }
+        Context.getPermissionsManager().checkPermission(
+                permission.getPropertyClass(), getUserId(), permission.getPropertyId());
+    }
+
+    @POST
+    public Response add(LinkedHashMap<String, Long> entity) throws SQLException, ClassNotFoundException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Permission permission = new Permission(entity);
+        checkPermission(permission, true);
+        Context.getDataManager().linkObject(permission.getOwnerClass(), permission.getOwnerId(),
+                permission.getPropertyClass(), permission.getPropertyId(), true);
+        Context.getPermissionsManager().refreshPermissions(permission);
+        return Response.noContent().build();
+    }
+
+    @DELETE
+    public Response remove(LinkedHashMap<String, Long> entity) throws SQLException, ClassNotFoundException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Permission permission = new Permission(entity);
+        checkPermission(permission, false);
+        Context.getDataManager().linkObject(permission.getOwnerClass(), permission.getOwnerId(),
+                permission.getPropertyClass(), permission.getPropertyId(), false);
+        Context.getPermissionsManager().refreshPermissions(permission);
+        return Response.noContent().build();
+    }
+
+}
diff --git a/src/org/traccar/api/resource/PositionResource.java b/src/org/traccar/api/resource/PositionResource.java
index 9d3cd9ae6..c031b842f 100644
--- a/src/org/traccar/api/resource/PositionResource.java
+++ b/src/org/traccar/api/resource/PositionResource.java
@@ -54,7 +54,7 @@ public class PositionResource extends BaseResource {
         if (!positionIds.isEmpty()) {
             ArrayList<Position> positions = new ArrayList<>();
             for (Long positionId : positionIds) {
-                Position position = Context.getDataManager().getPosition(positionId);
+                Position position = Context.getDataManager().getObject(Position.class, positionId);
                 Context.getPermissionsManager().checkDevice(getUserId(), position.getDeviceId());
                 positions.add(position);
             }
@@ -87,7 +87,7 @@ public class PositionResource extends BaseResource {
             @QueryParam("deviceId") long deviceId, @QueryParam("from") String from, @QueryParam("to") String to)
             throws SQLException {
         Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
-        GpxBuilder gpx = new GpxBuilder(Context.getIdentityManager().getDeviceById(deviceId).getName());
+        GpxBuilder gpx = new GpxBuilder(Context.getIdentityManager().getById(deviceId).getName());
         gpx.addPositions(Context.getDataManager().getPositions(
                 deviceId, DateUtil.parseDate(from), DateUtil.parseDate(to)));
         return Response.ok(gpx.build()).header(HttpHeaders.CONTENT_DISPOSITION, CONTENT_DISPOSITION_VALUE_GPX).build();
diff --git a/src/org/traccar/api/resource/SessionResource.java b/src/org/traccar/api/resource/SessionResource.java
index acdbb7c87..fa2a14c6f 100644
--- a/src/org/traccar/api/resource/SessionResource.java
+++ b/src/org/traccar/api/resource/SessionResource.java
@@ -80,7 +80,7 @@ public class SessionResource extends BaseResource {
                     request.getSession().setAttribute(USER_ID_KEY, userId);
                 }
             } else if (token != null) {
-                User user = Context.getPermissionsManager().getUserByToken(token);
+                User user = Context.getUsersManager().getUserByToken(token);
                 if (user != null) {
                     userId = user.getId();
                     request.getSession().setAttribute(USER_ID_KEY, userId);
diff --git a/src/org/traccar/api/resource/UserPermissionResource.java b/src/org/traccar/api/resource/UserPermissionResource.java
deleted file mode 100644
index a97c4a665..000000000
--- a/src/org/traccar/api/resource/UserPermissionResource.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright 2017 Anton Tananaev (anton@traccar.org)
- * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.api.resource;
-
-import java.sql.SQLException;
-
-import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
-import javax.ws.rs.POST;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-
-import org.traccar.Context;
-import org.traccar.api.BaseResource;
-import org.traccar.model.UserPermission;
-
-@Path("permissions/users")
-@Produces(MediaType.APPLICATION_JSON)
-@Consumes(MediaType.APPLICATION_JSON)
-public class UserPermissionResource extends BaseResource {
-
-    @POST
-    public Response add(UserPermission entity) throws SQLException {
-        Context.getPermissionsManager().checkAdmin(getUserId());
-        if (entity.getUserId() != entity.getManagedUserId()) {
-            Context.getDataManager().linkUser(entity.getUserId(), entity.getManagedUserId());
-            Context.getPermissionsManager().refreshUserPermissions();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @DELETE
-    public Response remove(UserPermission entity) throws SQLException {
-        Context.getPermissionsManager().checkAdmin(getUserId());
-        Context.getDataManager().unlinkUser(entity.getUserId(), entity.getManagedUserId());
-        Context.getPermissionsManager().refreshUserPermissions();
-        return Response.noContent().build();
-    }
-
-}
diff --git a/src/org/traccar/api/resource/UserResource.java b/src/org/traccar/api/resource/UserResource.java
index 4d8a8b3a4..0f6f6edba 100644
--- a/src/org/traccar/api/resource/UserResource.java
+++ b/src/org/traccar/api/resource/UserResource.java
@@ -16,17 +16,16 @@
 package org.traccar.api.resource;
 
 import org.traccar.Context;
-import org.traccar.api.BaseResource;
+import org.traccar.api.BaseObjectResource;
+import org.traccar.database.UsersManager;
+import org.traccar.model.ManagedUser;
 import org.traccar.model.User;
 
 import javax.annotation.security.PermitAll;
 import javax.ws.rs.Consumes;
-import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
 import javax.ws.rs.POST;
-import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
-import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
@@ -34,33 +33,42 @@ import javax.ws.rs.core.Response;
 import java.sql.SQLException;
 import java.util.Collection;
 import java.util.Date;
+import java.util.Set;
 
 @Path("users")
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
-public class UserResource extends BaseResource {
+public class UserResource extends BaseObjectResource<User> {
+
+    public UserResource() {
+        super(User.class);
+    }
 
     @GET
     public Collection<User> get(@QueryParam("userId") long userId) throws SQLException {
-        if (Context.getPermissionsManager().isAdmin(getUserId())) {
+        UsersManager usersManager = Context.getUsersManager();
+        Set<Long> result = null;
+        if (Context.getPermissionsManager().getUserAdmin(getUserId())) {
             if (userId != 0) {
-                return Context.getPermissionsManager().getUsers(userId);
+                result = usersManager.getUserItems(userId);
             } else {
-                return Context.getPermissionsManager().getAllUsers();
+                result = usersManager.getAllItems();
             }
-        } else if (Context.getPermissionsManager().isManager(getUserId())) {
-            return Context.getPermissionsManager().getManagedUsers(getUserId());
+        } else if (Context.getPermissionsManager().getUserManager(getUserId())) {
+            result = usersManager.getManagedItems(getUserId());
         } else {
             throw new SecurityException("Admin or manager access required");
         }
+        return usersManager.getItems(result);
     }
 
+    @Override
     @PermitAll
     @POST
     public Response add(User entity) throws SQLException {
-        if (!Context.getPermissionsManager().isAdmin(getUserId())) {
+        if (!Context.getPermissionsManager().getUserAdmin(getUserId())) {
             Context.getPermissionsManager().checkUserUpdate(getUserId(), new User(), entity);
-            if (Context.getPermissionsManager().isManager(getUserId())) {
+            if (Context.getPermissionsManager().getUserManager(getUserId())) {
                 Context.getPermissionsManager().checkUserLimit(getUserId());
             } else {
                 Context.getPermissionsManager().checkRegistration(getUserId());
@@ -72,44 +80,12 @@ public class UserResource extends BaseResource {
                 }
             }
         }
-        Context.getPermissionsManager().addUser(entity);
-        if (Context.getPermissionsManager().isManager(getUserId())) {
-            Context.getDataManager().linkUser(getUserId(), entity.getId());
-        }
-        Context.getPermissionsManager().refreshUserPermissions();
-        if (Context.getNotificationManager() != null) {
-            Context.getNotificationManager().refresh();
+        Context.getUsersManager().addItem(entity);
+        if (Context.getPermissionsManager().getUserManager(getUserId())) {
+            Context.getDataManager().linkObject(User.class, getUserId(), ManagedUser.class, entity.getId(), true);
         }
+        Context.getUsersManager().refreshUserItems();
         return Response.ok(entity).build();
     }
 
-    @Path("{id}")
-    @PUT
-    public Response update(User entity) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        User before = Context.getPermissionsManager().getUser(entity.getId());
-        Context.getPermissionsManager().checkUser(getUserId(), entity.getId());
-        Context.getPermissionsManager().checkUserUpdate(getUserId(), before, entity);
-        Context.getPermissionsManager().updateUser(entity);
-        if (Context.getNotificationManager() != null) {
-            Context.getNotificationManager().refresh();
-        }
-        return Response.ok(entity).build();
-    }
-
-    @Path("{id}")
-    @DELETE
-    public Response remove(@PathParam("id") long id) throws SQLException {
-        Context.getPermissionsManager().checkReadonly(getUserId());
-        Context.getPermissionsManager().checkUser(getUserId(), id);
-        Context.getPermissionsManager().removeUser(id);
-        if (Context.getGeofenceManager() != null) {
-            Context.getGeofenceManager().refreshUserGeofences();
-        }
-        if (Context.getNotificationManager() != null) {
-            Context.getNotificationManager().refresh();
-        }
-        return Response.noContent().build();
-    }
-
 }
diff --git a/src/org/traccar/database/AliasesManager.java b/src/org/traccar/database/AliasesManager.java
deleted file mode 100644
index 4f4f09731..000000000
--- a/src/org/traccar/database/AliasesManager.java
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.database;
-
-import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-
-import org.traccar.Context;
-import org.traccar.helper.Log;
-import org.traccar.model.AttributeAlias;
-
-public class AliasesManager {
-
-    private final DataManager dataManager;
-
-    private final Map<Long, Set<AttributeAlias>> deviceAliases = new ConcurrentHashMap<>();
-    private final Map<Long, AttributeAlias> aliasesById = new ConcurrentHashMap<>();
-
-    public AliasesManager(DataManager dataManager) {
-        this.dataManager = dataManager;
-        if (dataManager != null) {
-            try {
-                for (AttributeAlias attributeAlias : dataManager.getAttributeAliases()) {
-                    getAttributeAliases(attributeAlias.getDeviceId())
-                            .add(attributeAlias);
-                    aliasesById.put(attributeAlias.getId(), attributeAlias);
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-    }
-
-    public Set<AttributeAlias> getAttributeAliases(long deviceId) {
-        if (!deviceAliases.containsKey(deviceId)) {
-            deviceAliases.put(deviceId, new HashSet<AttributeAlias>());
-        }
-        return deviceAliases.get(deviceId);
-    }
-
-    public void removeDevice(long deviceId) {
-        for (AttributeAlias attributeAlias : getAttributeAliases(deviceId)) {
-            aliasesById.remove(attributeAlias.getId());
-        }
-        deviceAliases.remove(deviceId);
-    }
-
-    public void addAttributeAlias(AttributeAlias attributeAlias) throws SQLException {
-        dataManager.addAttributeAlias(attributeAlias);
-        aliasesById.put(attributeAlias.getId(), attributeAlias);
-        getAttributeAliases(attributeAlias.getDeviceId()).add(attributeAlias);
-    }
-
-    public void updateAttributeAlias(AttributeAlias attributeAlias) throws SQLException {
-        dataManager.updateAttributeAlias(attributeAlias);
-        AttributeAlias cachedAlias = aliasesById.get(attributeAlias.getId());
-        if (cachedAlias.getDeviceId() != attributeAlias.getDeviceId()) {
-            getAttributeAliases(cachedAlias.getDeviceId()).remove(cachedAlias);
-            cachedAlias.setDeviceId(attributeAlias.getDeviceId());
-            getAttributeAliases(cachedAlias.getDeviceId()).add(cachedAlias);
-        }
-        cachedAlias.setAttribute(attributeAlias.getAttribute());
-        cachedAlias.setAlias(attributeAlias.getAlias());
-    }
-
-    public void removeArrtibuteAlias(long attributeAliasId) throws SQLException {
-        dataManager.removeAttributeAlias(attributeAliasId);
-        AttributeAlias cachedAlias = aliasesById.get(attributeAliasId);
-        getAttributeAliases(cachedAlias.getDeviceId()).remove(cachedAlias);
-        aliasesById.remove(attributeAliasId);
-    }
-
-    public AttributeAlias getAttributeAlias(long deviceId, String attribute) {
-        for (AttributeAlias alias : getAttributeAliases(deviceId)) {
-            if (alias.getAttribute().equals(attribute)) {
-                return alias;
-            }
-        }
-        return null;
-    }
-
-    public Collection<AttributeAlias> getAllAttributeAliases(long userId) {
-        Collection<AttributeAlias> userDevicesAliases = new ArrayList<>();
-        for (long deviceId : Context.getPermissionsManager().getDevicePermissions(userId)) {
-            userDevicesAliases.addAll(getAttributeAliases(deviceId));
-        }
-        return userDevicesAliases;
-    }
-
-    public AttributeAlias getAttributeAlias(long id) {
-        return aliasesById.get(id);
-    }
-
-}
diff --git a/src/org/traccar/database/AttributesManager.java b/src/org/traccar/database/AttributesManager.java
index 362d6130f..28816645a 100644
--- a/src/org/traccar/database/AttributesManager.java
+++ b/src/org/traccar/database/AttributesManager.java
@@ -16,184 +16,21 @@
  */
 package org.traccar.database;
 
-import java.sql.SQLException;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.LinkedList;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-
-import org.traccar.Context;
-import org.traccar.helper.Log;
-import org.traccar.model.AttributePermission;
 import org.traccar.model.Attribute;
-import org.traccar.model.Device;
-import org.traccar.model.DeviceAttribute;
-import org.traccar.model.GroupAttribute;
-
-public class AttributesManager {
-
-    private final DataManager dataManager;
 
-    private final Map<Long, Attribute> attributes = new ConcurrentHashMap<>();
-    private final Map<Long, Set<Long>> deviceAttributes = new ConcurrentHashMap<>();
-    private final Map<Long, Set<Long>> deviceAttributesWithGroups = new ConcurrentHashMap<>();
-    private final Map<Long, Set<Long>> groupAttributes = new ConcurrentHashMap<>();
-    private final Map<Long, Set<Long>> userAttributes = new ConcurrentHashMap<>();
+public class AttributesManager extends ExtendedObjectManager<Attribute> {
 
     public AttributesManager(DataManager dataManager) {
-        this.dataManager = dataManager;
-        refreshAttributes();
-    }
-
-    public Set<Long> getUserAttributes(long userId) {
-        if (!userAttributes.containsKey(userId)) {
-            userAttributes.put(userId, new HashSet<Long>());
-        }
-        return userAttributes.get(userId);
-    }
-
-    public Set<Long> getGroupAttributes(long groupId) {
-        if (!groupAttributes.containsKey(groupId)) {
-            groupAttributes.put(groupId, new HashSet<Long>());
-        }
-        return groupAttributes.get(groupId);
-    }
-
-    public Set<Long> getDeviceAttributes(long deviceId) {
-        return getDeviceAttributes(deviceAttributes, deviceId);
-    }
-
-    public Set<Long> getAllDeviceAttributes(long deviceId) {
-        return getDeviceAttributes(deviceAttributesWithGroups, deviceId);
-    }
-
-    private Set<Long> getDeviceAttributes(Map<Long, Set<Long>> deviceAttributes, long deviceId) {
-        if (!deviceAttributes.containsKey(deviceId)) {
-            deviceAttributes.put(deviceId, new HashSet<Long>());
-        }
-        return deviceAttributes.get(deviceId);
-    }
-
-    public final void refreshAttributes() {
-        if (dataManager != null) {
-            try {
-                attributes.clear();
-                for (Attribute attribute : dataManager.getAttributes()) {
-                    attributes.put(attribute.getId(), attribute);
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-        refreshUserAttributes();
-        refresh();
-    }
-
-    public final void refreshUserAttributes() {
-        if (dataManager != null) {
-            try {
-                userAttributes.clear();
-                for (AttributePermission attributePermission : dataManager.getAttributePermissions()) {
-                    getUserAttributes(attributePermission.getUserId()).add(attributePermission.getAttributeId());
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-    }
-
-    public final void refresh() {
-        if (dataManager != null) {
-            try {
-
-                Collection<GroupAttribute> databaseGroupAttributes = dataManager.getGroupAttributes();
-
-                groupAttributes.clear();
-                for (GroupAttribute groupAttribute : databaseGroupAttributes) {
-                    getGroupAttributes(groupAttribute.getGroupId()).add(groupAttribute.getAttributeId());
-                }
-
-                Collection<DeviceAttribute> databaseDeviceAttributes = dataManager.getDeviceAttributes();
-                Collection<Device> allDevices = Context.getDeviceManager().getAllDevices();
-
-                deviceAttributes.clear();
-                deviceAttributesWithGroups.clear();
-
-                for (DeviceAttribute deviceAttribute : databaseDeviceAttributes) {
-                    getDeviceAttributes(deviceAttribute.getDeviceId())
-                        .add(deviceAttribute.getAttributeId());
-                    getAllDeviceAttributes(deviceAttribute.getDeviceId())
-                        .add(deviceAttribute.getAttributeId());
-                }
-
-                for (Device device : allDevices) {
-                    long groupId = device.getGroupId();
-                    while (groupId != 0) {
-                        getAllDeviceAttributes(device.getId()).addAll(getGroupAttributes(groupId));
-                        if (Context.getDeviceManager().getGroupById(groupId) != null) {
-                            groupId = Context.getDeviceManager().getGroupById(groupId).getGroupId();
-                        } else {
-                            groupId = 0;
-                        }
-                    }
-                }
-
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-    }
-
-    public void addAttribute(Attribute attribute) throws SQLException {
-        dataManager.addAttribute(attribute);
-        attributes.put(attribute.getId(), attribute);
+        super(dataManager, Attribute.class);
     }
 
-    public void updateAttribute(Attribute attribute) throws SQLException {
-        dataManager.updateAttribute(attribute);
-        Attribute cachedAttribute = attributes.get(attribute.getId());
+    @Override
+    public void updateCachedItem(Attribute attribute) {
+        Attribute cachedAttribute = getById(attribute.getId());
         cachedAttribute.setDescription(attribute.getDescription());
         cachedAttribute.setAttribute(attribute.getAttribute());
         cachedAttribute.setExpression(attribute.getExpression());
         cachedAttribute.setType(attribute.getType());
     }
 
-    public void removeAttribute(long computedAttributeId) throws SQLException {
-        dataManager.removeAttribute(computedAttributeId);
-        attributes.remove(computedAttributeId);
-        refreshUserAttributes();
-        refresh();
-    }
-
-    public boolean checkAttribute(long userId, long attributeId) {
-        return getUserAttributes(userId).contains(attributeId);
-    }
-
-    public Attribute getAttribute(long id) {
-        return attributes.get(id);
-    }
-
-    public final Collection<Attribute> getAttributes(Set<Long> attributeIds) {
-        Collection<Attribute> result = new LinkedList<>();
-        for (long attributeId : attributeIds) {
-            result.add(getAttribute(attributeId));
-        }
-        return result;
-    }
-
-    public final Set<Long> getAllAttributes() {
-        return attributes.keySet();
-    }
-
-    public final Set<Long> getManagedAttributes(long userId) {
-        Set<Long> attributes = new HashSet<>();
-        attributes.addAll(getUserAttributes(userId));
-        for (long managedUserId : Context.getPermissionsManager().getUserPermissions(userId)) {
-            attributes.addAll(getUserAttributes(managedUserId));
-        }
-        return attributes;
-    }
-
 }
diff --git a/src/org/traccar/database/BaseObjectManager.java b/src/org/traccar/database/BaseObjectManager.java
new file mode 100644
index 000000000..cc1dbde5f
--- /dev/null
+++ b/src/org/traccar/database/BaseObjectManager.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.traccar.helper.Log;
+import org.traccar.model.BaseModel;
+
+public class BaseObjectManager<T extends BaseModel> {
+
+    private final DataManager dataManager;
+
+    private Map<Long, T> items;
+    private Class<T> baseClass;
+
+    protected BaseObjectManager(DataManager dataManager, Class<T> baseClass) {
+        this.dataManager = dataManager;
+        this.baseClass = baseClass;
+        refreshItems();
+    }
+
+    protected final DataManager getDataManager() {
+        return dataManager;
+    }
+
+    protected final Class<T> getBaseClass() {
+        return baseClass;
+    }
+
+    public T getById(long itemId) {
+        return items.get(itemId);
+    }
+
+    public void refreshItems() {
+        if (dataManager != null) {
+            try {
+                Collection<T> databaseItems = dataManager.getObjects(baseClass);
+                if (items == null) {
+                    items = new ConcurrentHashMap<>(databaseItems.size());
+                }
+                Set<Long> databaseItemIds = new HashSet<>();
+                for (T item : databaseItems) {
+                    databaseItemIds.add(item.getId());
+                    if (items.containsKey(item.getId())) {
+                        updateCachedItem(item);
+                    } else {
+                        addNewItem(item);
+                    }
+                }
+                for (Long cachedItemId : items.keySet()) {
+                    if (!databaseItemIds.contains(cachedItemId)) {
+                        removeCachedItem(cachedItemId);
+                    }
+                }
+            } catch (SQLException error) {
+                Log.warning(error);
+            }
+        }
+    }
+
+    protected void addNewItem(T item) {
+        items.put(item.getId(), item);
+    }
+
+    public void addItem(T item) throws SQLException {
+        dataManager.addObject(item);
+        addNewItem(item);
+    }
+
+    protected void updateCachedItem(T item) {
+        items.put(item.getId(), item);
+    }
+
+    public void updateItem(T item) throws SQLException {
+        dataManager.updateObject(item);
+        updateCachedItem(item);
+    }
+
+    protected void removeCachedItem(long itemId) {
+        items.remove(itemId);
+    }
+
+    public void removeItem(long itemId) throws SQLException {
+        BaseModel item = getById(itemId);
+        if (item != null) {
+            dataManager.removeObject(baseClass, itemId);
+            removeCachedItem(itemId);
+        }
+    }
+
+    public final Collection<T> getItems(Set<Long> itemIds) {
+        Collection<T> result = new LinkedList<>();
+        for (long itemId : itemIds) {
+            result.add(getById(itemId));
+        }
+        return result;
+    }
+
+    public Set<Long> getAllItems() {
+        return items.keySet();
+    }
+
+}
diff --git a/src/org/traccar/database/CalendarManager.java b/src/org/traccar/database/CalendarManager.java
index 31d484327..44ced1082 100644
--- a/src/org/traccar/database/CalendarManager.java
+++ b/src/org/traccar/database/CalendarManager.java
@@ -16,107 +16,12 @@
  */
 package org.traccar.database;
 
-import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-
-import org.traccar.Context;
-import org.traccar.helper.Log;
 import org.traccar.model.Calendar;
-import org.traccar.model.CalendarPermission;
-
-public class CalendarManager {
-
-    private final DataManager dataManager;
 
-    private final Map<Long, Calendar> calendars = new ConcurrentHashMap<>();
-    private final Map<Long, Set<Long>> userCalendars = new ConcurrentHashMap<>();
+public class CalendarManager extends SimpleObjectManager<Calendar> {
 
     public CalendarManager(DataManager dataManager) {
-        this.dataManager = dataManager;
-        refreshCalendars();
-    }
-
-    public final void refreshCalendars() {
-        if (dataManager != null) {
-            try {
-                calendars.clear();
-                for (Calendar calendar : dataManager.getCalendars()) {
-                    calendars.put(calendar.getId(), calendar);
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-        refreshUserCalendars();
-    }
-
-    private Set<Long> getUserCalendarIds(long userId) {
-        if (!userCalendars.containsKey(userId)) {
-            userCalendars.put(userId, new HashSet<Long>());
-        }
-        return userCalendars.get(userId);
-    }
-
-    public Collection<Calendar> getUserCalendars(long userId) {
-        ArrayList<Calendar> result = new ArrayList<>();
-        for (long calendarId : getUserCalendarIds(userId)) {
-            result.add(calendars.get(calendarId));
-        }
-        return result;
-    }
-
-    public Collection<Calendar> getManagedCalendars(long userId) {
-        ArrayList<Calendar> result = new ArrayList<>();
-        result.addAll(getUserCalendars(userId));
-        for (long managedUserId : Context.getPermissionsManager().getUserPermissions(userId)) {
-            result.addAll(getUserCalendars(managedUserId));
-        }
-        return result;
-    }
-
-    public final void refreshUserCalendars() {
-        if (dataManager != null) {
-            try {
-                userCalendars.clear();
-                for (CalendarPermission calendarsPermission : dataManager.getCalendarPermissions()) {
-                    getUserCalendarIds(calendarsPermission.getUserId()).add(calendarsPermission.getCalendarId());
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-    }
-
-    public Calendar getCalendar(long calendarId) {
-        return calendars.get(calendarId);
-    }
-
-    public final void addCalendar(Calendar calendar) throws SQLException {
-        dataManager.addCalendar(calendar);
-        calendars.put(calendar.getId(), calendar);
-    }
-
-    public final void updateCalendar(Calendar calendar) throws SQLException {
-        dataManager.updateCalendar(calendar);
-        calendars.put(calendar.getId(), calendar);
-    }
-
-    public final void removeCalendar(long calendarId) throws SQLException {
-        dataManager.removeCalendar(calendarId);
-        calendars.remove(calendarId);
-        refreshUserCalendars();
+        super(dataManager, Calendar.class);
     }
 
-    public Collection<Calendar> getAllCalendars() {
-        return calendars.values();
-    }
-
-    public boolean checkCalendar(long userId, long calendarId) {
-        return getUserCalendarIds(userId).contains(calendarId);
-    }
 }
diff --git a/src/org/traccar/database/CommandsManager.java b/src/org/traccar/database/CommandsManager.java
new file mode 100644
index 000000000..9ceb995ef
--- /dev/null
+++ b/src/org/traccar/database/CommandsManager.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.traccar.BaseProtocol;
+import org.traccar.Context;
+import org.traccar.helper.Log;
+import org.traccar.model.Command;
+import org.traccar.model.Typed;
+import org.traccar.model.Position;
+
+public class CommandsManager  extends ExtendedObjectManager<Command> {
+
+    private final Map<Long, Queue<Command>> deviceQueues = new ConcurrentHashMap<>();
+
+    public CommandsManager(DataManager dataManager) {
+        super(dataManager, Command.class);
+    }
+
+    public boolean checkDeviceCommand(long deviceId, long commandId) {
+        return !getAllDeviceItems(deviceId).contains(commandId);
+    }
+
+    public boolean sendCommand(Command command) throws Exception {
+        long deviceId = command.getDeviceId();
+        if (command.getId() != 0) {
+            command = getById(command.getId()).clone();
+            command.setDeviceId(deviceId);
+        }
+        if (command.getTextChannel()) {
+            Position lastPosition = Context.getIdentityManager().getLastPosition(deviceId);
+            String phone = Context.getIdentityManager().getById(deviceId).getPhone();
+            if (lastPosition != null) {
+                BaseProtocol protocol = Context.getServerManager().getProtocol(lastPosition.getProtocol());
+                protocol.sendTextCommand(phone, command);
+            } else if (command.getType().equals(Command.TYPE_CUSTOM)) {
+                if (Context.getSmppManager() != null) {
+                    Context.getSmppManager().sendMessageSync(phone, command.getString(Command.KEY_DATA), true);
+                } else {
+                    throw new RuntimeException("SMPP client is not enabled");
+                }
+            } else {
+                throw new RuntimeException("Command " + command.getType() + " is not supported");
+            }
+        } else {
+            ActiveDevice activeDevice = Context.getConnectionManager().getActiveDevice(deviceId);
+            if (activeDevice != null) {
+                activeDevice.sendCommand(command);
+            } else {
+                getDeviceQueue(deviceId).add(command);
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public Collection<Long> getSupportedCommands(long deviceId) {
+        List<Long> result = new ArrayList<>();
+        Position lastPosition = Context.getIdentityManager().getLastPosition(deviceId);
+        for (long commandId : getAllDeviceItems(deviceId)) {
+            Command command = getById(commandId);
+            if (lastPosition != null) {
+                BaseProtocol protocol = Context.getServerManager().getProtocol(lastPosition.getProtocol());
+                if (command.getTextChannel() && protocol.getSupportedTextCommands().contains(command.getType())
+                        || !command.getTextChannel()
+                        && protocol.getSupportedDataCommands().contains(command.getType())) {
+                    result.add(commandId);
+                }
+            } else if (command.getType().equals(Command.TYPE_CUSTOM)) {
+                result.add(commandId);
+            }
+        }
+        return result;
+    }
+
+    public Collection<Typed> getCommandTypes(long deviceId, boolean textChannel) {
+        List<Typed> result = new ArrayList<>();
+        Position lastPosition = Context.getIdentityManager().getLastPosition(deviceId);
+        if (lastPosition != null) {
+            BaseProtocol protocol = Context.getServerManager().getProtocol(lastPosition.getProtocol());
+            Collection<String> commands;
+            commands = textChannel ? protocol.getSupportedTextCommands() : protocol.getSupportedDataCommands();
+            for (String commandKey : commands) {
+                result.add(new Typed(commandKey));
+            }
+        } else {
+            result.add(new Typed(Command.TYPE_CUSTOM));
+        }
+        return result;
+    }
+
+    public Collection<Typed> getAllCommandTypes() {
+        List<Typed> result = new ArrayList<>();
+        Field[] fields = Command.class.getDeclaredFields();
+        for (Field field : fields) {
+            if (Modifier.isStatic(field.getModifiers()) && field.getName().startsWith("TYPE_")) {
+                try {
+                    result.add(new Typed(field.get(null).toString()));
+                } catch (IllegalArgumentException | IllegalAccessException error) {
+                    Log.warning(error);
+                }
+            }
+        }
+        return result;
+    }
+
+    private Queue<Command> getDeviceQueue(long deviceId) {
+        if (!deviceQueues.containsKey(deviceId)) {
+            deviceQueues.put(deviceId, new ConcurrentLinkedQueue<Command>());
+        }
+        return deviceQueues.get(deviceId);
+    }
+
+    public void sendQueuedCommands(ActiveDevice activeDevice) {
+        Queue<Command> deviceQueue = deviceQueues.get(activeDevice.getDeviceId());
+        if (deviceQueue != null) {
+            Command command = deviceQueue.poll();
+            while (command != null) {
+                activeDevice.sendCommand(command);
+                command = deviceQueue.poll();
+            }
+        }
+    }
+
+}
diff --git a/src/org/traccar/database/ConnectionManager.java b/src/org/traccar/database/ConnectionManager.java
index 0baafb578..e5a7a272f 100644
--- a/src/org/traccar/database/ConnectionManager.java
+++ b/src/org/traccar/database/ConnectionManager.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,14 +21,17 @@ import org.jboss.netty.util.TimerTask;
 import org.traccar.Context;
 import org.traccar.GlobalTimer;
 import org.traccar.Protocol;
+import org.traccar.events.OverspeedEventHandler;
 import org.traccar.helper.Log;
 import org.traccar.model.Device;
+import org.traccar.model.DeviceState;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.net.SocketAddress;
 import java.sql.SQLException;
 import java.util.Date;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
@@ -41,6 +44,7 @@ public class ConnectionManager {
 
     private final long deviceTimeout;
     private final boolean enableStatusEvents;
+    private final boolean updateDeviceState;
 
     private final Map<Long, ActiveDevice> activeDevices = new ConcurrentHashMap<>();
     private final Map<Long, Set<UpdateListener>> listeners = new ConcurrentHashMap<>();
@@ -49,10 +53,13 @@ public class ConnectionManager {
     public ConnectionManager() {
         deviceTimeout = Context.getConfig().getLong("status.timeout", DEFAULT_TIMEOUT) * 1000;
         enableStatusEvents = Context.getConfig().getBoolean("event.enable");
+        updateDeviceState = Context.getConfig().getBoolean("status.updateDeviceState");
     }
 
     public void addActiveDevice(long deviceId, Protocol protocol, Channel channel, SocketAddress remoteAddress) {
-        activeDevices.put(deviceId, new ActiveDevice(deviceId, protocol, channel, remoteAddress));
+        ActiveDevice activeDevice = new ActiveDevice(deviceId, protocol, channel, remoteAddress);
+        activeDevices.put(deviceId, activeDevice);
+        Context.getCommandsManager().sendQueuedCommands(activeDevice);
     }
 
     public void removeActiveDevice(Channel channel) {
@@ -70,7 +77,7 @@ public class ConnectionManager {
     }
 
     public void updateDevice(final long deviceId, String status, Date time) {
-        Device device = Context.getIdentityManager().getDeviceById(deviceId);
+        Device device = Context.getIdentityManager().getById(deviceId);
         if (device == null) {
             return;
         }
@@ -80,21 +87,26 @@ public class ConnectionManager {
 
         if (enableStatusEvents && !status.equals(oldStatus)) {
             String eventType;
+            Map<Event, Position> events = new HashMap<>();
             switch (status) {
                 case Device.STATUS_ONLINE:
                     eventType = Event.TYPE_DEVICE_ONLINE;
                     break;
                 case Device.STATUS_UNKNOWN:
                     eventType = Event.TYPE_DEVICE_UNKNOWN;
+                    if (updateDeviceState) {
+                        events.putAll(updateDeviceState(deviceId));
+                    }
                     break;
                 default:
                     eventType = Event.TYPE_DEVICE_OFFLINE;
+                    if (updateDeviceState) {
+                        events.putAll(updateDeviceState(deviceId));
+                    }
                     break;
             }
-            Event event = new Event(eventType, deviceId);
-            if (Context.getNotificationManager() != null) {
-                Context.getNotificationManager().updateEvent(event, null);
-            }
+            events.put(new Event(eventType, deviceId), null);
+            Context.getNotificationManager().updateEvents(events);
         }
 
         Timeout timeout = timeouts.remove(deviceId);
@@ -112,6 +124,7 @@ public class ConnectionManager {
                 public void run(Timeout timeout) throws Exception {
                     if (!timeout.isCancelled()) {
                         updateDevice(deviceId, Device.STATUS_UNKNOWN, null);
+                        activeDevices.remove(deviceId);
                     }
                 }
             }, deviceTimeout, TimeUnit.MILLISECONDS));
@@ -126,6 +139,24 @@ public class ConnectionManager {
         updateDevice(device);
     }
 
+    public Map<Event, Position> updateDeviceState(long deviceId) {
+        DeviceState deviceState = Context.getDeviceManager().getDeviceState(deviceId);
+        Map<Event, Position> result = new HashMap<>();
+
+        Map<Event, Position> event = Context.getMotionEventHandler().updateMotionState(deviceState);
+        if (event != null) {
+            result.putAll(event);
+        }
+
+        event = Context.getOverspeedEventHandler().updateOverspeedState(deviceState, Context.getDeviceManager().
+                lookupAttributeDouble(deviceId, OverspeedEventHandler.ATTRIBUTE_SPEED_LIMIT, 0, false));
+        if (event != null) {
+            result.putAll(event);
+        }
+
+        return result;
+    }
+
     public synchronized void updateDevice(Device device) {
         for (long userId : Context.getPermissionsManager().getDeviceUsers(device.getId())) {
             if (listeners.containsKey(userId)) {
diff --git a/src/org/traccar/database/DataManager.java b/src/org/traccar/database/DataManager.java
index dd65289e4..e88ff7f0d 100644
--- a/src/org/traccar/database/DataManager.java
+++ b/src/org/traccar/database/DataManager.java
@@ -15,14 +15,18 @@
  */
 package org.traccar.database;
 
+import java.beans.Introspector;
 import java.io.File;
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.sql.SQLException;
 import java.text.SimpleDateFormat;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
 
 import javax.naming.InitialContext;
 import javax.sql.DataSource;
@@ -37,38 +41,40 @@ import liquibase.resource.ResourceAccessor;
 
 import org.traccar.Config;
 import org.traccar.helper.Log;
-import org.traccar.model.AttributeAlias;
-import org.traccar.model.AttributePermission;
-import org.traccar.model.Calendar;
-import org.traccar.model.CalendarPermission;
 import org.traccar.model.Attribute;
 import org.traccar.model.Device;
-import org.traccar.model.DeviceAttribute;
-import org.traccar.model.DevicePermission;
+import org.traccar.model.Driver;
 import org.traccar.model.Event;
 import org.traccar.model.Geofence;
 import org.traccar.model.Group;
-import org.traccar.model.GroupAttribute;
-import org.traccar.model.GroupGeofence;
-import org.traccar.model.GroupPermission;
+import org.traccar.model.ManagedUser;
 import org.traccar.model.Notification;
+import org.traccar.model.Permission;
+import org.traccar.model.BaseModel;
+import org.traccar.model.Calendar;
+import org.traccar.model.Command;
 import org.traccar.model.Position;
 import org.traccar.model.Server;
 import org.traccar.model.Statistics;
 import org.traccar.model.User;
-import org.traccar.model.UserPermission;
-import org.traccar.model.DeviceGeofence;
-import org.traccar.model.GeofencePermission;
 
 import com.zaxxer.hikari.HikariConfig;
 import com.zaxxer.hikari.HikariDataSource;
 
 public class DataManager {
 
+    public static final String ACTION_SELECT_ALL = "selectAll";
+    public static final String ACTION_SELECT = "select";
+    public static final String ACTION_INSERT = "insert";
+    public static final String ACTION_UPDATE = "update";
+    public static final String ACTION_DELETE = "delete";
+
     private final Config config;
 
     private DataSource dataSource;
 
+    private boolean generateQueries;
+
     public DataManager(Config config) throws Exception {
         this.config = config;
 
@@ -117,11 +123,83 @@ public class DataManager {
                 hikariConfig.setMaximumPoolSize(maxPoolSize);
             }
 
+            generateQueries = config.getBoolean("database.generateQueries");
+
             dataSource = new HikariDataSource(hikariConfig);
 
         }
     }
 
+    public static String constructObjectQuery(String action, Class<?> clazz, boolean extended) {
+        switch (action) {
+            case ACTION_INSERT:
+            case ACTION_UPDATE:
+                StringBuilder result = new StringBuilder();
+                StringBuilder fields = new StringBuilder();
+                StringBuilder values = new StringBuilder();
+
+                Set<Method> methods = new HashSet<>(Arrays.asList(clazz.getMethods()));
+                methods.removeAll(Arrays.asList(Object.class.getMethods()));
+                methods.removeAll(Arrays.asList(BaseModel.class.getMethods()));
+                for (Method method : methods) {
+                    boolean skip;
+                    if (extended) {
+                        skip = !method.isAnnotationPresent(QueryExtended.class);
+                    } else {
+                        skip = method.isAnnotationPresent(QueryIgnore.class)
+                                || method.isAnnotationPresent(QueryExtended.class) && !action.equals(ACTION_INSERT);
+                    }
+                    if (!skip && method.getName().startsWith("get") && method.getParameterTypes().length == 0) {
+                        String name = Introspector.decapitalize(method.getName().substring(3));
+                        if (action.equals(ACTION_INSERT)) {
+                            fields.append(name).append(", ");
+                            values.append(":").append(name).append(", ");
+                        } else {
+                            fields.append(name).append(" = :").append(name).append(", ");
+                        }
+                    }
+                }
+                fields.setLength(fields.length() - 2);
+                if (action.equals(ACTION_INSERT)) {
+                    values.setLength(values.length() - 2);
+                    result.append("INSERT INTO ").append(getObjectsTableName(clazz)).append(" (");
+                    result.append(fields).append(") ");
+                    result.append("VALUES (").append(values).append(")");
+                } else {
+                    result.append("UPDATE ").append(getObjectsTableName(clazz)).append(" SET ");
+                    result.append(fields);
+                    result.append(" WHERE id = :id");
+                }
+                return result.toString();
+            case ACTION_SELECT_ALL:
+                return "SELECT * FROM " + getObjectsTableName(clazz);
+            case ACTION_SELECT:
+                return "SELECT * FROM " + getObjectsTableName(clazz) + " WHERE id = :id";
+            case ACTION_DELETE:
+                return "DELETE FROM " + getObjectsTableName(clazz) + " WHERE id = :id";
+            default:
+                throw new IllegalArgumentException("Unknown action");
+        }
+    }
+
+    public static String constructPermissionQuery(String action, Class<?> owner, Class<?> property) {
+        switch (action) {
+        case ACTION_SELECT_ALL:
+            return "SELECT " + makeNameId(owner) + ", " + makeNameId(property) + " FROM "
+                    + getPermissionsTableName(owner, property);
+        case ACTION_INSERT:
+            return "INSERT INTO " + getPermissionsTableName(owner, property)
+                    + " (" + makeNameId(owner) + ", " + makeNameId(property) + ") VALUES (:"
+                    + makeNameId(owner) + ", :" + makeNameId(property) + ")";
+        case ACTION_DELETE:
+            return "DELETE FROM " + getPermissionsTableName(owner, property)
+                    + " WHERE " + makeNameId(owner) + " = :" + makeNameId(owner)
+                    + " AND " + makeNameId(property) + " = :" + makeNameId(property);
+        default:
+            throw new IllegalArgumentException("Unknown action");
+        }
+    }
+
     private String getQuery(String key) {
         String query = config.getString(key);
         if (query == null) {
@@ -130,6 +208,73 @@ public class DataManager {
         return query;
     }
 
+    public String getQuery(String action, Class<?> clazz) {
+        return getQuery(action, clazz, false);
+    }
+
+    public String getQuery(String action, Class<?> clazz, boolean extended) {
+        String queryName;
+        if (action.equals(ACTION_SELECT_ALL)) {
+            queryName = "database.select" + clazz.getSimpleName() + "s";
+        } else {
+            queryName = "database." + action.toLowerCase() + clazz.getSimpleName();
+            if (extended) {
+                queryName += "Extended";
+            }
+        }
+        String query = config.getString(queryName);
+        if (query == null) {
+            if (generateQueries) {
+                query = constructObjectQuery(action, clazz, extended);
+                config.setString(queryName, query);
+            } else {
+                Log.info("Query not provided: " + queryName);
+            }
+        }
+
+        return query;
+    }
+
+    public String getQuery(String action, Class<?> owner, Class<?> property) {
+        String queryName;
+        if (action.equals(ACTION_SELECT_ALL)) {
+            queryName = "database.select" + owner.getSimpleName() + property.getSimpleName() + "s";
+        } else if (action.equals(ACTION_INSERT)) {
+            queryName = "database.link" + owner.getSimpleName() + property.getSimpleName();
+        } else {
+            queryName = "database.unlink" + owner.getSimpleName() + property.getSimpleName();
+        }
+        String query = config.getString(queryName);
+        if (query == null) {
+            if (generateQueries) {
+                query = constructPermissionQuery(action, owner,
+                        property.equals(User.class) ? ManagedUser.class : property);
+                config.setString(queryName, query);
+            } else {
+                Log.info("Query not provided: " + queryName);
+            }
+        }
+
+        return query;
+    }
+
+    private static String getPermissionsTableName(Class<?> owner, Class<?> property) {
+        String propertyName = property.getSimpleName();
+        if (propertyName.equals("ManagedUser")) {
+            propertyName = "User";
+        }
+        return Introspector.decapitalize(owner.getSimpleName()) + "_" + Introspector.decapitalize(propertyName);
+    }
+
+    private static String getObjectsTableName(Class<?> clazz) {
+        String result = Introspector.decapitalize(clazz.getSimpleName());
+        // Add "s" ending if object name is not plural already
+        if (!result.endsWith("s")) {
+            result += "s";
+        }
+        return result;
+    }
+
     private void initDatabaseSchema() throws SQLException, LiquibaseException {
 
         if (config.hasKey("database.changelog")) {
@@ -153,7 +298,7 @@ public class DataManager {
 
     public User login(String email, String password) throws SQLException {
         User user = QueryBuilder.create(dataSource, getQuery("database.loginUser"))
-                .setString("email", email)
+                .setString("email", email.trim())
                 .executeQuerySingle(User.class);
         if (user != null && user.isPasswordValid(password)) {
             return user;
@@ -162,124 +307,12 @@ public class DataManager {
         }
     }
 
-    public Collection<User> getUsers() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectUsersAll"))
-                .executeQuery(User.class);
-    }
-
-    public void addUser(User user) throws SQLException {
-        user.setId(QueryBuilder.create(dataSource, getQuery("database.insertUser"), true)
-                .setObject(user)
-                .executeUpdate());
-    }
-
-    public void updateUser(User user) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateUser"))
-                .setObject(user)
-                .executeUpdate();
-        if (user.getHashedPassword() != null) {
-            QueryBuilder.create(dataSource, getQuery("database.updateUserPassword"))
-                .setObject(user)
-                .executeUpdate();
-        }
-    }
-
-    public void removeUser(long userId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteUser"))
-                .setLong("id", userId)
-                .executeUpdate();
-    }
-
-    public Collection<DevicePermission> getDevicePermissions() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectDevicePermissions"))
-                .executeQuery(DevicePermission.class);
-    }
-
-    public Collection<GroupPermission> getGroupPermissions() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectGroupPermissions"))
-                .executeQuery(GroupPermission.class);
-    }
-
-    public Collection<Device> getAllDevices() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectDevicesAll"))
-                .executeQuery(Device.class);
-    }
-
-    public void addDevice(Device device) throws SQLException {
-        device.setId(QueryBuilder.create(dataSource, getQuery("database.insertDevice"), true)
-                .setObject(device)
-                .executeUpdate());
-    }
-
-    public void updateDevice(Device device) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateDevice"))
-                .setObject(device)
-                .executeUpdate();
-    }
-
     public void updateDeviceStatus(Device device) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateDeviceStatus"))
+        QueryBuilder.create(dataSource, getQuery(ACTION_UPDATE, Device.class, true))
                 .setObject(device)
                 .executeUpdate();
     }
 
-    public void removeDevice(long deviceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteDevice"))
-                .setLong("id", deviceId)
-                .executeUpdate();
-    }
-
-    public void linkDevice(long userId, long deviceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkDevice"))
-                .setLong("userId", userId)
-                .setLong("deviceId", deviceId)
-                .executeUpdate();
-    }
-
-    public void unlinkDevice(long userId, long deviceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkDevice"))
-                .setLong("userId", userId)
-                .setLong("deviceId", deviceId)
-                .executeUpdate();
-    }
-
-    public Collection<Group> getAllGroups() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectGroupsAll"))
-                .executeQuery(Group.class);
-    }
-
-    public void addGroup(Group group) throws SQLException {
-        group.setId(QueryBuilder.create(dataSource, getQuery("database.insertGroup"), true)
-                .setObject(group)
-                .executeUpdate());
-    }
-
-    public void updateGroup(Group group) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateGroup"))
-                .setObject(group)
-                .executeUpdate();
-    }
-
-    public void removeGroup(long groupId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteGroup"))
-                .setLong("id", groupId)
-                .executeUpdate();
-    }
-
-    public void linkGroup(long userId, long groupId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkGroup"))
-                .setLong("userId", userId)
-                .setLong("groupId", groupId)
-                .executeUpdate();
-    }
-
-    public void unlinkGroup(long userId, long groupId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkGroup"))
-                .setLong("userId", userId)
-                .setLong("groupId", groupId)
-                .executeUpdate();
-    }
-
     public Collection<Position> getPositions(long deviceId, Date from, Date to) throws SQLException {
         return QueryBuilder.create(dataSource, getQuery("database.selectPositions"))
                 .setLong("deviceId", deviceId)
@@ -288,16 +321,10 @@ public class DataManager {
                 .executeQuery(Position.class);
     }
 
-    public Position getPosition(long positionId) throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectPosition"))
-                .setLong("id", positionId)
-                .executeQuerySingle(Position.class);
-    }
-
     public void addPosition(Position position) throws SQLException {
-        position.setId(QueryBuilder.create(dataSource, getQuery("database.insertPosition"), true)
-                .setDate("now", new Date())
+        position.setId(QueryBuilder.create(dataSource, getQuery(ACTION_INSERT, Position.class), true)
                 .setObject(position)
+                .setDate("serverTime", new Date())
                 .executeUpdate());
     }
 
@@ -328,28 +355,10 @@ public class DataManager {
     }
 
     public Server getServer() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectServers"))
+        return QueryBuilder.create(dataSource, getQuery(ACTION_SELECT_ALL, Server.class))
                 .executeQuerySingle(Server.class);
     }
 
-    public void updateServer(Server server) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateServer"))
-                .setObject(server)
-                .executeUpdate();
-    }
-
-    public Event getEvent(long eventId) throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectEvent"))
-                .setLong("id", eventId)
-                .executeQuerySingle(Event.class);
-    }
-
-    public void addEvent(Event event) throws SQLException {
-        event.setId(QueryBuilder.create(dataSource, getQuery("database.insertEvent"), true)
-                .setObject(event)
-                .executeUpdate());
-    }
-
     public Collection<Event> getEvents(long deviceId, Date from, Date to) throws SQLException {
         return QueryBuilder.create(dataSource, getQuery("database.selectEvents"))
                 .setLong("deviceId", deviceId)
@@ -358,132 +367,6 @@ public class DataManager {
                 .executeQuery(Event.class);
     }
 
-    public Collection<Geofence> getGeofences() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectGeofencesAll"))
-                .executeQuery(Geofence.class);
-    }
-
-    public void addGeofence(Geofence geofence) throws SQLException {
-        geofence.setId(QueryBuilder.create(dataSource, getQuery("database.insertGeofence"), true)
-                .setObject(geofence)
-                .executeUpdate());
-    }
-
-    public void updateGeofence(Geofence geofence) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateGeofence"))
-                .setObject(geofence)
-                .executeUpdate();
-    }
-
-    public void removeGeofence(long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteGeofence"))
-                .setLong("id", geofenceId)
-                .executeUpdate();
-    }
-
-    public Collection<GeofencePermission> getGeofencePermissions() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectGeofencePermissions"))
-                .executeQuery(GeofencePermission.class);
-    }
-
-    public void linkGeofence(long userId, long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkGeofence"))
-                .setLong("userId", userId)
-                .setLong("geofenceId", geofenceId)
-                .executeUpdate();
-    }
-
-    public void unlinkGeofence(long userId, long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkGeofence"))
-                .setLong("userId", userId)
-                .setLong("geofenceId", geofenceId)
-                .executeUpdate();
-    }
-
-    public Collection<GroupGeofence> getGroupGeofences() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectGroupGeofences"))
-                .executeQuery(GroupGeofence.class);
-    }
-
-    public void linkGroupGeofence(long groupId, long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkGroupGeofence"))
-                .setLong("groupId", groupId)
-                .setLong("geofenceId", geofenceId)
-                .executeUpdate();
-    }
-
-    public void unlinkGroupGeofence(long groupId, long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkGroupGeofence"))
-                .setLong("groupId", groupId)
-                .setLong("geofenceId", geofenceId)
-                .executeUpdate();
-    }
-
-    public Collection<DeviceGeofence> getDeviceGeofences() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectDeviceGeofences"))
-                .executeQuery(DeviceGeofence.class);
-    }
-
-    public void linkDeviceGeofence(long deviceId, long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkDeviceGeofence"))
-                .setLong("deviceId", deviceId)
-                .setLong("geofenceId", geofenceId)
-                .executeUpdate();
-    }
-
-    public void unlinkDeviceGeofence(long deviceId, long geofenceId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkDeviceGeofence"))
-                .setLong("deviceId", deviceId)
-                .setLong("geofenceId", geofenceId)
-                .executeUpdate();
-    }
-
-    public Collection<Notification> getNotifications() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectNotifications"))
-                .executeQuery(Notification.class);
-    }
-
-    public void addNotification(Notification notification) throws SQLException {
-        notification.setId(QueryBuilder.create(dataSource, getQuery("database.insertNotification"), true)
-                .setObject(notification)
-                .executeUpdate());
-    }
-
-    public void updateNotification(Notification notification) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateNotification"))
-                .setObject(notification)
-                .executeUpdate();
-    }
-
-    public void removeNotification(Notification notification) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteNotification"))
-                .setLong("id", notification.getId())
-                .executeUpdate();
-    }
-
-    public Collection<AttributeAlias> getAttributeAliases() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectAttributeAliases"))
-                .executeQuery(AttributeAlias.class);
-    }
-
-    public void addAttributeAlias(AttributeAlias attributeAlias) throws SQLException {
-        attributeAlias.setId(QueryBuilder.create(dataSource, getQuery("database.insertAttributeAlias"), true)
-                .setObject(attributeAlias)
-                .executeUpdate());
-    }
-
-    public void updateAttributeAlias(AttributeAlias attributeAlias) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateAttributeAlias"))
-                .setObject(attributeAlias)
-                .executeUpdate();
-    }
-
-    public void removeAttributeAlias(long attributeAliasId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteAttributeAlias"))
-                .setLong("id", attributeAliasId)
-                .executeUpdate();
-    }
-
     public Collection<Statistics> getStatistics(Date from, Date to) throws SQLException {
         return QueryBuilder.create(dataSource, getQuery("database.selectStatistics"))
                 .setDate("from", from)
@@ -491,150 +374,83 @@ public class DataManager {
                 .executeQuery(Statistics.class);
     }
 
-    public void addStatistics(Statistics statistics) throws SQLException {
-        statistics.setId(QueryBuilder.create(dataSource, getQuery("database.insertStatistics"), true)
-                .setObject(statistics)
-                .executeUpdate());
-    }
-
-    public Collection<Calendar> getCalendars() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectCalendarsAll"))
-                .executeQuery(Calendar.class);
-    }
-
-    public void addCalendar(Calendar calendar) throws SQLException {
-        calendar.setId(QueryBuilder.create(dataSource, getQuery("database.insertCalendar"), true)
-                .setObject(calendar)
-                .executeUpdate());
-    }
-
-    public void updateCalendar(Calendar calendar) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateCalendar"))
-                .setObject(calendar)
-                .executeUpdate();
-    }
-
-    public void removeCalendar(long calendarId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteCalendar"))
-                .setLong("id", calendarId)
-                .executeUpdate();
-    }
-
-    public Collection<CalendarPermission> getCalendarPermissions() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectCalendarPermissions"))
-                .executeQuery(CalendarPermission.class);
-    }
-
-    public void linkCalendar(long userId, long calendarId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkCalendar"))
-                .setLong("userId", userId)
-                .setLong("calendarId", calendarId)
-                .executeUpdate();
+    public static Class<?> getClassByName(String name) throws ClassNotFoundException {
+        switch (name.toLowerCase().replace("id", "")) {
+            case "device":
+                return Device.class;
+            case "group":
+                return Group.class;
+            case "user":
+                return User.class;
+            case "manageduser":
+                return ManagedUser.class;
+            case "geofence":
+                return Geofence.class;
+            case "driver":
+                return Driver.class;
+            case "attribute":
+                return Attribute.class;
+            case "calendar":
+                return Calendar.class;
+            case "command":
+                return Command.class;
+            case "notification":
+                return Notification.class;
+            default:
+                throw new ClassNotFoundException();
+        }
     }
 
-    public void unlinkCalendar(long userId, long calendarId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkCalendar"))
-                .setLong("userId", userId)
-                .setLong("calendarId", calendarId)
-                .executeUpdate();
+    private static String makeNameId(Class<?> clazz) {
+        String name = clazz.getSimpleName();
+        return Introspector.decapitalize(name) + (!name.contains("Id") ? "Id" : "");
     }
 
-    public Collection<UserPermission> getUserPermissions() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectUserPermissions"))
-                .executeQuery(UserPermission.class);
+    public Collection<Permission> getPermissions(Class<? extends BaseModel> owner, Class<? extends BaseModel> property)
+            throws SQLException, ClassNotFoundException {
+        return QueryBuilder.create(dataSource, getQuery(ACTION_SELECT_ALL, owner, property))
+                .executePermissionsQuery();
     }
 
-    public void linkUser(long userId, long managedUserId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkUser"))
-                .setLong("userId", userId)
-                .setLong("managedUserId", managedUserId)
+    public void linkObject(Class<?> owner, long ownerId, Class<?> property, long propertyId, boolean link)
+            throws SQLException {
+        QueryBuilder.create(dataSource, getQuery(link ? ACTION_INSERT : ACTION_DELETE, owner, property))
+                .setLong(makeNameId(owner), ownerId)
+                .setLong(makeNameId(property), propertyId)
                 .executeUpdate();
     }
 
-    public void unlinkUser(long userId, long managedUserId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkUser"))
-                .setLong("userId", userId)
-                .setLong("managedUserId", managedUserId)
-                .executeUpdate();
+    public <T extends BaseModel> T getObject(Class<T> clazz, long entityId) throws SQLException {
+        return QueryBuilder.create(dataSource, getQuery(ACTION_SELECT, clazz))
+                .setLong("id", entityId)
+                .executeQuerySingle(clazz);
     }
 
-    public Collection<Attribute> getAttributes() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectAttributes"))
-                .executeQuery(Attribute.class);
+    public <T extends BaseModel> Collection<T> getObjects(Class<T> clazz) throws SQLException {
+        return QueryBuilder.create(dataSource, getQuery(ACTION_SELECT_ALL, clazz))
+                .executeQuery(clazz);
     }
 
-    public void addAttribute(Attribute attribute) throws SQLException {
-        attribute.setId(QueryBuilder.create(dataSource, getQuery("database.insertAttribute"), true)
-                .setObject(attribute)
+    public void addObject(BaseModel entity) throws SQLException {
+        entity.setId(QueryBuilder.create(dataSource, getQuery(ACTION_INSERT, entity.getClass()), true)
+                .setObject(entity)
                 .executeUpdate());
     }
 
-    public void updateAttribute(Attribute attribute) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.updateAttribute"))
-                .setObject(attribute)
-                .executeUpdate();
-    }
-
-    public void removeAttribute(long computedAttributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.deleteAttribute"))
-                .setLong("id", computedAttributeId)
-                .executeUpdate();
-    }
-
-    public Collection<AttributePermission> getAttributePermissions() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectAttributePermissions"))
-                .executeQuery(AttributePermission.class);
-    }
-
-    public void linkAttribute(long userId, long attributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkAttribute"))
-                .setLong("userId", userId)
-                .setLong("attributeId", attributeId)
-                .executeUpdate();
-    }
-
-    public void unlinkAttribute(long userId, long attributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkAttribute"))
-                .setLong("userId", userId)
-                .setLong("attributeId", attributeId)
-                .executeUpdate();
-    }
-
-    public Collection<GroupAttribute> getGroupAttributes() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectGroupAttributes"))
-                .executeQuery(GroupAttribute.class);
-    }
-
-    public void linkGroupAttribute(long groupId, long attributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkGroupAttribute"))
-                .setLong("groupId", groupId)
-                .setLong("attributeId", attributeId)
-                .executeUpdate();
-    }
-
-    public void unlinkGroupAttribute(long groupId, long attributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkGroupAttribute"))
-                .setLong("groupId", groupId)
-                .setLong("attributeId", attributeId)
-                .executeUpdate();
-    }
-
-    public Collection<DeviceAttribute> getDeviceAttributes() throws SQLException {
-        return QueryBuilder.create(dataSource, getQuery("database.selectDeviceAttributes"))
-                .executeQuery(DeviceAttribute.class);
-    }
-
-    public void linkDeviceAttribute(long deviceId, long attributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.linkDeviceAttribute"))
-                .setLong("deviceId", deviceId)
-                .setLong("attributeId", attributeId)
+    public void updateObject(BaseModel entity) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery(ACTION_UPDATE, entity.getClass()))
+                .setObject(entity)
                 .executeUpdate();
+        if (entity instanceof User && ((User) entity).getHashedPassword() != null) {
+            QueryBuilder.create(dataSource, getQuery(ACTION_UPDATE, User.class, true))
+                    .setObject(entity)
+                    .executeUpdate();
+        }
     }
 
-    public void unlinkDeviceAttribute(long deviceId, long attributeId) throws SQLException {
-        QueryBuilder.create(dataSource, getQuery("database.unlinkDeviceAttribute"))
-                .setLong("deviceId", deviceId)
-                .setLong("attributeId", attributeId)
+    public void removeObject(Class<? extends BaseModel> clazz, long entityId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery(ACTION_DELETE, clazz))
+                .setLong("id", entityId)
                 .executeUpdate();
     }
 
diff --git a/src/org/traccar/database/DeviceManager.java b/src/org/traccar/database/DeviceManager.java
index f2a2dd565..1eb90b7eb 100644
--- a/src/org/traccar/database/DeviceManager.java
+++ b/src/org/traccar/database/DeviceManager.java
@@ -16,10 +16,8 @@
 package org.traccar.database;
 
 import java.sql.SQLException;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
-import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -27,137 +25,56 @@ import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicLong;
 
-import org.traccar.BaseProtocol;
 import org.traccar.Config;
 import org.traccar.Context;
 import org.traccar.helper.Log;
-import org.traccar.model.Command;
-import org.traccar.model.CommandType;
 import org.traccar.model.Device;
+import org.traccar.model.DeviceState;
 import org.traccar.model.DeviceTotalDistance;
 import org.traccar.model.Group;
 import org.traccar.model.Position;
 import org.traccar.model.Server;
 
-public class DeviceManager implements IdentityManager {
+public class DeviceManager extends BaseObjectManager<Device> implements IdentityManager, ManagableObjects {
 
     public static final long DEFAULT_REFRESH_DELAY = 300;
 
     private final Config config;
-    private final DataManager dataManager;
     private final long dataRefreshDelay;
     private boolean lookupGroupsAttribute;
 
-    private Map<Long, Device> devicesById;
     private Map<String, Device> devicesByUniqueId;
     private Map<String, Device> devicesByPhone;
     private AtomicLong devicesLastUpdate = new AtomicLong();
 
-    private Map<Long, Group> groupsById;
-    private AtomicLong groupsLastUpdate = new AtomicLong();
-
     private final Map<Long, Position> positions = new ConcurrentHashMap<>();
 
-    private boolean fallbackToText;
+    private final Map<Long, DeviceState> deviceStates = new ConcurrentHashMap<>();
 
     public DeviceManager(DataManager dataManager) {
-        this.dataManager = dataManager;
+        super(dataManager, Device.class);
         this.config = Context.getConfig();
+        if (devicesByPhone == null) {
+            devicesByPhone = new ConcurrentHashMap<>();
+        }
+        if (devicesByUniqueId == null) {
+            devicesByUniqueId = new ConcurrentHashMap<>();
+        }
         dataRefreshDelay = config.getLong("database.refreshDelay", DEFAULT_REFRESH_DELAY) * 1000;
         lookupGroupsAttribute = config.getBoolean("deviceManager.lookupGroupsAttribute");
-        fallbackToText = config.getBoolean("command.fallbackToSms");
-        if (dataManager != null) {
-            try {
-                updateGroupCache(true);
-                updateDeviceCache(true);
-                for (Position position : dataManager.getLatestPositions()) {
-                    positions.put(position.getDeviceId(), position);
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
+        refreshLastPositions();
     }
 
     private void updateDeviceCache(boolean force) throws SQLException {
-
         long lastUpdate = devicesLastUpdate.get();
         if ((force || System.currentTimeMillis() - lastUpdate > dataRefreshDelay)
                 && devicesLastUpdate.compareAndSet(lastUpdate, System.currentTimeMillis())) {
-            GeofenceManager geofenceManager = Context.getGeofenceManager();
-            Collection<Device> databaseDevices = dataManager.getAllDevices();
-            if (devicesById == null) {
-                devicesById = new ConcurrentHashMap<>(databaseDevices.size());
-            }
-            if (devicesByUniqueId == null) {
-                devicesByUniqueId = new ConcurrentHashMap<>(databaseDevices.size());
-            }
-            if (devicesByPhone == null) {
-                devicesByPhone = new ConcurrentHashMap<>(databaseDevices.size());
-            }
-            Set<Long> databaseDevicesIds = new HashSet<>();
-            Set<String> databaseDevicesUniqueIds = new HashSet<>();
-            Set<String> databaseDevicesPhones = new HashSet<>();
-            for (Device device : databaseDevices) {
-                databaseDevicesIds.add(device.getId());
-                databaseDevicesUniqueIds.add(device.getUniqueId());
-                databaseDevicesPhones.add(device.getPhone());
-                if (devicesById.containsKey(device.getId())) {
-                    Device cachedDevice = devicesById.get(device.getId());
-                    cachedDevice.setName(device.getName());
-                    cachedDevice.setGroupId(device.getGroupId());
-                    cachedDevice.setCategory(device.getCategory());
-                    cachedDevice.setContact(device.getContact());
-                    cachedDevice.setModel(device.getModel());
-                    cachedDevice.setAttributes(device.getAttributes());
-                    if (!device.getUniqueId().equals(cachedDevice.getUniqueId())) {
-                        devicesByUniqueId.put(device.getUniqueId(), cachedDevice);
-                    }
-                    cachedDevice.setUniqueId(device.getUniqueId());
-                    if (device.getPhone() != null && !device.getPhone().isEmpty()
-                            && !device.getPhone().equals(cachedDevice.getPhone())) {
-                        devicesByPhone.put(device.getPhone(), cachedDevice);
-                    }
-                    cachedDevice.setPhone(device.getPhone());
-                } else {
-                    devicesById.put(device.getId(), device);
-                    devicesByUniqueId.put(device.getUniqueId(), device);
-                    if (device.getPhone() != null && !device.getPhone().isEmpty()) {
-                        devicesByPhone.put(device.getPhone(), device);
-                    }
-                    if (geofenceManager != null) {
-                        Position lastPosition = getLastPosition(device.getId());
-                        if (lastPosition != null) {
-                            device.setGeofenceIds(geofenceManager.getCurrentDeviceGeofences(lastPosition));
-                        }
-                    }
-                }
-            }
-            for (Iterator<Long> iterator = devicesById.keySet().iterator(); iterator.hasNext();) {
-                if (!databaseDevicesIds.contains(iterator.next())) {
-                    iterator.remove();
-                }
-            }
-            for (Iterator<String> iterator = devicesByUniqueId.keySet().iterator(); iterator.hasNext();) {
-                if (!databaseDevicesUniqueIds.contains(iterator.next())) {
-                    iterator.remove();
-                }
-            }
-            for (Iterator<String> iterator = devicesByPhone.keySet().iterator(); iterator.hasNext();) {
-                if (!databaseDevicesPhones.contains(iterator.next())) {
-                    iterator.remove();
-                }
-            }
+            refreshItems();
         }
     }
 
     @Override
-    public Device getDeviceById(long id) {
-        return devicesById.get(id);
-    }
-
-    @Override
-    public Device getDeviceByUniqueId(String uniqueId) throws SQLException {
+    public Device getByUniqueId(String uniqueId) throws SQLException {
         boolean forceUpdate = !devicesByUniqueId.containsKey(uniqueId) && !config.getBoolean("database.ignoreUnknown");
 
         updateDeviceCache(forceUpdate);
@@ -169,76 +86,127 @@ public class DeviceManager implements IdentityManager {
         return devicesByPhone.get(phone);
     }
 
+    @Override
+    public Set<Long> getAllItems() {
+        Set<Long> result = super.getAllItems();
+        if (result.isEmpty()) {
+            try {
+                updateDeviceCache(true);
+            } catch (SQLException e) {
+                Log.warning(e);
+            }
+            result = super.getAllItems();
+        }
+        return result;
+    }
+
     public Collection<Device> getAllDevices() {
-        boolean forceUpdate = devicesById.isEmpty();
+        return getItems(getAllItems());
+    }
 
-        try {
-            updateDeviceCache(forceUpdate);
-        } catch (SQLException e) {
-            Log.warning(e);
+    @Override
+    public Set<Long> getUserItems(long userId) {
+        if (Context.getPermissionsManager() != null) {
+            return Context.getPermissionsManager().getDevicePermissions(userId);
+        } else {
+            return new HashSet<>();
         }
-
-        return devicesById.values();
     }
 
-    public Collection<Device> getDevices(long userId) throws SQLException {
-        Collection<Device> devices = new ArrayList<>();
-        for (long id : Context.getPermissionsManager().getDevicePermissions(userId)) {
-            devices.add(devicesById.get(id));
+    @Override
+    public Set<Long> getManagedItems(long userId) {
+        Set<Long> result = new HashSet<>();
+        result.addAll(getUserItems(userId));
+        for (long managedUserId : Context.getUsersManager().getUserItems(userId)) {
+            result.addAll(getUserItems(managedUserId));
         }
-        return devices;
+        return result;
     }
 
-    public Collection<Device> getManagedDevices(long userId) throws SQLException {
-        Collection<Device> devices = new HashSet<>();
-        devices.addAll(getDevices(userId));
-        for (long managedUserId : Context.getPermissionsManager().getUserPermissions(userId)) {
-            devices.addAll(getDevices(managedUserId));
+    private void putUniqueDeviceId(Device device) {
+        if (devicesByUniqueId == null) {
+            devicesByUniqueId = new ConcurrentHashMap<>(getAllItems().size());
         }
-        return devices;
+        devicesByUniqueId.put(device.getUniqueId(), device);
     }
 
-    public void addDevice(Device device) throws SQLException {
-        dataManager.addDevice(device);
+    private void putPhone(Device device) {
+        if (devicesByPhone == null) {
+            devicesByPhone = new ConcurrentHashMap<>(getAllItems().size());
+        }
+        devicesByPhone.put(device.getPhone(), device);
+    }
 
-        devicesById.put(device.getId(), device);
-        devicesByUniqueId.put(device.getUniqueId(), device);
+    @Override
+    protected void addNewItem(Device device) {
+        super.addNewItem(device);
+        putUniqueDeviceId(device);
         if (device.getPhone() != null  && !device.getPhone().isEmpty()) {
-            devicesByPhone.put(device.getPhone(), device);
+            putPhone(device);
+        }
+        if (Context.getGeofenceManager() != null) {
+            Position lastPosition = getLastPosition(device.getId());
+            if (lastPosition != null) {
+                device.setGeofenceIds(Context.getGeofenceManager().getCurrentDeviceGeofences(lastPosition));
+            }
         }
     }
 
-    public void updateDevice(Device device) throws SQLException {
-        dataManager.updateDevice(device);
+    @Override
+    protected void updateCachedItem(Device device) {
+        Device cachedDevice = getById(device.getId());
+        cachedDevice.setName(device.getName());
+        cachedDevice.setGroupId(device.getGroupId());
+        cachedDevice.setCategory(device.getCategory());
+        cachedDevice.setContact(device.getContact());
+        cachedDevice.setModel(device.getModel());
+        cachedDevice.setAttributes(device.getAttributes());
+        if (!device.getUniqueId().equals(cachedDevice.getUniqueId())) {
+            devicesByUniqueId.remove(cachedDevice.getUniqueId());
+            cachedDevice.setUniqueId(device.getUniqueId());
+            putUniqueDeviceId(cachedDevice);
+        }
+        if (device.getPhone() != null && !device.getPhone().isEmpty()
+                && !device.getPhone().equals(cachedDevice.getPhone())) {
+            devicesByPhone.remove(cachedDevice.getPhone());
+            cachedDevice.setPhone(device.getPhone());
+            putPhone(cachedDevice);
+        }
+    }
 
-        devicesById.put(device.getId(), device);
-        devicesByUniqueId.put(device.getUniqueId(), device);
-        if (device.getPhone() != null && !device.getPhone().isEmpty()) {
-            devicesByPhone.put(device.getPhone(), device);
+    @Override
+    protected void removeCachedItem(long deviceId) {
+        Device cachedDevice = getById(deviceId);
+        if (cachedDevice != null) {
+            String deviceUniqueId = cachedDevice.getUniqueId();
+            String phone = cachedDevice.getPhone();
+            super.removeCachedItem(deviceId);
+            devicesByUniqueId.remove(deviceUniqueId);
+            if (phone != null && !phone.isEmpty()) {
+                devicesByPhone.remove(phone);
+            }
         }
+        positions.remove(deviceId);
     }
 
     public void updateDeviceStatus(Device device) throws SQLException {
-        dataManager.updateDeviceStatus(device);
-        if (devicesById.containsKey(device.getId())) {
-            Device cachedDevice = devicesById.get(device.getId());
+        getDataManager().updateDeviceStatus(device);
+        Device cachedDevice = getById(device.getId());
+        if (cachedDevice != null) {
             cachedDevice.setStatus(device.getStatus());
         }
     }
 
-    public void removeDevice(long deviceId) throws SQLException {
-        dataManager.removeDevice(deviceId);
-
-        if (devicesById.containsKey(deviceId)) {
-            String deviceUniqueId = devicesById.get(deviceId).getUniqueId();
-            String phone = devicesById.get(deviceId).getPhone();
-            devicesById.remove(deviceId);
-            devicesByUniqueId.remove(deviceUniqueId);
-            if (phone != null && !phone.isEmpty()) {
-                devicesByPhone.remove(phone);
+    private void refreshLastPositions() {
+        if (getDataManager() != null) {
+            try {
+                for (Position position : getDataManager().getLatestPositions()) {
+                    positions.put(position.getDeviceId(), position);
+                }
+            } catch (SQLException error) {
+                Log.warning(error);
             }
         }
-        positions.remove(deviceId);
     }
 
     public boolean isLatestPosition(Position position) {
@@ -250,10 +218,11 @@ public class DeviceManager implements IdentityManager {
 
         if (isLatestPosition(position)) {
 
-            dataManager.updateLatestPosition(position);
+            getDataManager().updateLatestPosition(position);
 
-            if (devicesById.containsKey(position.getDeviceId())) {
-                devicesById.get(position.getDeviceId()).setPositionId(position.getId());
+            Device device = getById(position.getDeviceId());
+            if (device != null) {
+                device.setPositionId(position.getId());
             }
 
             positions.put(position.getDeviceId(), position);
@@ -274,7 +243,7 @@ public class DeviceManager implements IdentityManager {
         List<Position> result = new LinkedList<>();
 
         if (Context.getPermissionsManager() != null) {
-            for (long deviceId : Context.getPermissionsManager().getDevicePermissions(userId)) {
+            for (long deviceId : getUserItems(userId)) {
                 if (positions.containsKey(deviceId)) {
                     result.add(positions.get(deviceId));
                 }
@@ -284,154 +253,62 @@ public class DeviceManager implements IdentityManager {
         return result;
     }
 
-    private void updateGroupCache(boolean force) throws SQLException {
-
-        long lastUpdate = groupsLastUpdate.get();
-        if ((force || System.currentTimeMillis() - lastUpdate > dataRefreshDelay)
-                && groupsLastUpdate.compareAndSet(lastUpdate, System.currentTimeMillis())) {
-            Collection<Group> databaseGroups = dataManager.getAllGroups();
-            if (groupsById == null) {
-                groupsById = new ConcurrentHashMap<>(databaseGroups.size());
-            }
-            Set<Long> databaseGroupsIds = new HashSet<>();
-            for (Group group : databaseGroups) {
-                databaseGroupsIds.add(group.getId());
-                if (groupsById.containsKey(group.getId())) {
-                    Group cachedGroup = groupsById.get(group.getId());
-                    cachedGroup.setName(group.getName());
-                    cachedGroup.setGroupId(group.getGroupId());
-                } else {
-                    groupsById.put(group.getId(), group);
-                }
-            }
-            for (Long cachedGroupId : groupsById.keySet()) {
-                if (!databaseGroupsIds.contains(cachedGroupId)) {
-                    devicesById.remove(cachedGroupId);
-                }
-            }
-            databaseGroupsIds.clear();
-        }
-    }
-
-    public Group getGroupById(long id) {
-        return groupsById.get(id);
-    }
-
-    public Collection<Group> getAllGroups() {
-        boolean forceUpdate = groupsById.isEmpty();
-
-        try {
-            updateGroupCache(forceUpdate);
-        } catch (SQLException e) {
-            Log.warning(e);
-        }
-
-        return groupsById.values();
-    }
-
-    public Collection<Group> getGroups(long userId) throws SQLException {
-        Collection<Group> groups = new ArrayList<>();
-        for (long id : Context.getPermissionsManager().getGroupPermissions(userId)) {
-            groups.add(getGroupById(id));
-        }
-        return groups;
-    }
-
-    public Collection<Group> getManagedGroups(long userId) throws SQLException {
-        Collection<Group> groups = new ArrayList<>();
-        groups.addAll(getGroups(userId));
-        for (long managedUserId : Context.getPermissionsManager().getUserPermissions(userId)) {
-            groups.addAll(getGroups(managedUserId));
-        }
-        return groups;
-    }
-
-    private void checkGroupCycles(Group group) {
-        Set<Long> groups = new HashSet<>();
-        while (group != null) {
-            if (groups.contains(group.getId())) {
-                throw new IllegalArgumentException("Cycle in group hierarchy");
-            }
-            groups.add(group.getId());
-            group = groupsById.get(group.getGroupId());
-        }
-    }
-
-    public void addGroup(Group group) throws SQLException {
-        checkGroupCycles(group);
-        dataManager.addGroup(group);
-        groupsById.put(group.getId(), group);
-    }
-
-    public void updateGroup(Group group) throws SQLException {
-        checkGroupCycles(group);
-        dataManager.updateGroup(group);
-        groupsById.put(group.getId(), group);
-    }
-
-    public void removeGroup(long groupId) throws SQLException {
-        dataManager.removeGroup(groupId);
-        groupsById.remove(groupId);
-    }
-
     public boolean lookupAttributeBoolean(
             long deviceId, String attributeName, boolean defaultValue, boolean lookupConfig) {
-        String result = lookupAttribute(deviceId, attributeName, lookupConfig);
+        Object result = lookupAttribute(deviceId, attributeName, lookupConfig);
         if (result != null) {
-            return Boolean.parseBoolean(result);
+            return result instanceof String ? Boolean.parseBoolean((String) result) : (Boolean) result;
         }
         return defaultValue;
     }
 
     public String lookupAttributeString(
             long deviceId, String attributeName, String defaultValue, boolean lookupConfig) {
-        String result = lookupAttribute(deviceId, attributeName, lookupConfig);
-        if (result != null) {
-            return result;
-        }
-        return defaultValue;
+        Object result = lookupAttribute(deviceId, attributeName, lookupConfig);
+        return result != null ? (String) result : defaultValue;
     }
 
     public int lookupAttributeInteger(long deviceId, String attributeName, int defaultValue, boolean lookupConfig) {
-        String result = lookupAttribute(deviceId, attributeName, lookupConfig);
+        Object result = lookupAttribute(deviceId, attributeName, lookupConfig);
         if (result != null) {
-            return Integer.parseInt(result);
+            return result instanceof String ? Integer.parseInt((String) result) : ((Number) result).intValue();
         }
         return defaultValue;
     }
 
     public long lookupAttributeLong(
             long deviceId, String attributeName, long defaultValue, boolean lookupConfig) {
-        String result = lookupAttribute(deviceId, attributeName, lookupConfig);
+        Object result = lookupAttribute(deviceId, attributeName, lookupConfig);
         if (result != null) {
-            return Long.parseLong(result);
+            return result instanceof String ? Long.parseLong((String) result) : ((Number) result).longValue();
         }
         return defaultValue;
     }
 
     public double lookupAttributeDouble(
             long deviceId, String attributeName, double defaultValue, boolean lookupConfig) {
-        String result = lookupAttribute(deviceId, attributeName, lookupConfig);
+        Object result = lookupAttribute(deviceId, attributeName, lookupConfig);
         if (result != null) {
-            return Double.parseDouble(result);
+            return result instanceof String ? Double.parseDouble((String) result) : ((Number) result).doubleValue();
         }
         return defaultValue;
     }
 
-    private String lookupAttribute(long deviceId, String attributeName, boolean lookupConfig) {
-        String result = null;
-        Device device = getDeviceById(deviceId);
+    private Object lookupAttribute(long deviceId, String attributeName, boolean lookupConfig) {
+        Object result = null;
+        Device device = getById(deviceId);
         if (device != null) {
-            result = device.getString(attributeName);
+            result = device.getAttributes().get(attributeName);
             if (result == null && lookupGroupsAttribute) {
                 long groupId = device.getGroupId();
                 while (groupId != 0) {
-                    if (getGroupById(groupId) != null) {
-                        result = getGroupById(groupId).getString(attributeName);
+                    Group group = Context.getGroupsManager().getById(groupId);
+                    if (group != null) {
+                        result = group.getAttributes().get(attributeName);
                         if (result != null) {
                             break;
                         }
-                        groupId = getGroupById(groupId).getGroupId();
+                        groupId = group.getGroupId();
                     } else {
                         groupId = 0;
                     }
@@ -442,7 +319,7 @@ public class DeviceManager implements IdentityManager {
                     result = Context.getConfig().getString(attributeName);
                 } else {
                     Server server = Context.getPermissionsManager().getServer();
-                    result = server.getString(attributeName);
+                    result = server.getAttributes().get(attributeName);
                 }
             }
         }
@@ -453,54 +330,24 @@ public class DeviceManager implements IdentityManager {
         Position last = positions.get(deviceTotalDistance.getDeviceId());
         if (last != null) {
             last.getAttributes().put(Position.KEY_TOTAL_DISTANCE, deviceTotalDistance.getTotalDistance());
-            dataManager.addPosition(last);
+            getDataManager().addPosition(last);
             updateLatestPosition(last);
         } else {
             throw new IllegalArgumentException();
         }
     }
 
-    public void sendCommand(Command command) throws Exception {
-        long deviceId = command.getDeviceId();
-        if (command.getTextChannel()) {
-            Position lastPosition = getLastPosition(deviceId);
-            if (lastPosition != null) {
-                BaseProtocol protocol = Context.getServerManager().getProtocol(lastPosition.getProtocol());
-                protocol.sendTextCommand(devicesById.get(deviceId).getPhone(), command);
-            } else if (command.getType().equals(Command.TYPE_CUSTOM)) {
-                Context.getSmppManager().sendMessageSync(devicesById.get(deviceId).getPhone(),
-                        command.getString(Command.KEY_DATA), true);
-            } else {
-                throw new RuntimeException("Command " + command.getType() + " is not supported");
-            }
-        } else {
-            ActiveDevice activeDevice = Context.getConnectionManager().getActiveDevice(deviceId);
-            if (activeDevice != null) {
-                activeDevice.sendCommand(command);
-            } else {
-                if (fallbackToText) {
-                    command.setTextChannel(true);
-                    sendCommand(command);
-                } else {
-                    throw new RuntimeException("Device is not online");
-                }
-            }
+    public DeviceState getDeviceState(long deviceId) {
+        DeviceState deviceState = deviceStates.get(deviceId);
+        if (deviceState == null) {
+            deviceState = new DeviceState();
+            deviceStates.put(deviceId, deviceState);
         }
+        return deviceState;
     }
 
-    public Collection<CommandType> getCommandTypes(long deviceId, boolean textChannel) {
-        List<CommandType> result = new ArrayList<>();
-        Position lastPosition = Context.getDeviceManager().getLastPosition(deviceId);
-        if (lastPosition != null) {
-            BaseProtocol protocol = Context.getServerManager().getProtocol(lastPosition.getProtocol());
-            Collection<String> commands;
-            commands = textChannel ? protocol.getSupportedTextCommands() : protocol.getSupportedDataCommands();
-            for (String commandKey : commands) {
-                result.add(new CommandType(commandKey));
-            }
-        } else {
-            result.add(new CommandType(Command.TYPE_CUSTOM));
-        }
-        return result;
+    public void setDeviceState(long deviceId, DeviceState deviceState) {
+        deviceStates.put(deviceId, deviceState);
     }
+
 }
diff --git a/src/org/traccar/database/DriversManager.java b/src/org/traccar/database/DriversManager.java
new file mode 100644
index 000000000..930951460
--- /dev/null
+++ b/src/org/traccar/database/DriversManager.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.traccar.model.Driver;
+
+public class DriversManager extends ExtendedObjectManager<Driver> {
+
+    private Map<String, Driver> driversByUniqueId;
+
+    public DriversManager(DataManager dataManager) {
+        super(dataManager, Driver.class);
+        if (driversByUniqueId == null) {
+            driversByUniqueId = new ConcurrentHashMap<>();
+        }
+    }
+
+    private void putUniqueDriverId(Driver driver) {
+        if (driversByUniqueId == null) {
+            driversByUniqueId = new ConcurrentHashMap<>(getAllItems().size());
+        }
+        driversByUniqueId.put(driver.getUniqueId(), driver);
+    }
+
+    @Override
+    protected void addNewItem(Driver driver) {
+        super.addNewItem(driver);
+        putUniqueDriverId(driver);
+    }
+
+    @Override
+    protected void updateCachedItem(Driver driver) {
+        Driver cachedDriver = getById(driver.getId());
+        cachedDriver.setName(driver.getName());
+        if (!driver.getUniqueId().equals(cachedDriver.getUniqueId())) {
+            driversByUniqueId.remove(cachedDriver.getUniqueId());
+            cachedDriver.setUniqueId(driver.getUniqueId());
+            putUniqueDriverId(cachedDriver);
+        }
+        cachedDriver.setAttributes(driver.getAttributes());
+    }
+
+    @Override
+    protected void removeCachedItem(long driverId) {
+        Driver cachedDriver = getById(driverId);
+        if (cachedDriver != null) {
+            String driverUniqueId = cachedDriver.getUniqueId();
+            super.removeCachedItem(driverId);
+            driversByUniqueId.remove(driverUniqueId);
+        }
+    }
+
+    public Driver getDriverByUniqueId(String uniqueId) {
+        return driversByUniqueId.get(uniqueId);
+    }
+}
diff --git a/src/org/traccar/database/ExtendedObjectManager.java b/src/org/traccar/database/ExtendedObjectManager.java
new file mode 100644
index 000000000..16785cb37
--- /dev/null
+++ b/src/org/traccar/database/ExtendedObjectManager.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.traccar.Context;
+import org.traccar.helper.Log;
+import org.traccar.model.Device;
+import org.traccar.model.Group;
+import org.traccar.model.Permission;
+import org.traccar.model.BaseModel;
+
+public abstract class ExtendedObjectManager<T extends BaseModel> extends SimpleObjectManager<T> {
+
+    private final Map<Long, Set<Long>> deviceItems = new ConcurrentHashMap<>();
+    private final Map<Long, Set<Long>> deviceItemsWithGroups = new ConcurrentHashMap<>();
+    private final Map<Long, Set<Long>> groupItems = new ConcurrentHashMap<>();
+
+    protected ExtendedObjectManager(DataManager dataManager, Class<T> baseClass) {
+        super(dataManager, baseClass);
+        refreshExtendedPermissions();
+    }
+
+    public final Set<Long> getGroupItems(long groupId) {
+        if (!groupItems.containsKey(groupId)) {
+            groupItems.put(groupId, new HashSet<Long>());
+        }
+        return groupItems.get(groupId);
+    }
+
+    public final Set<Long> getDeviceItems(long deviceId) {
+        if (!deviceItems.containsKey(deviceId)) {
+            deviceItems.put(deviceId, new HashSet<Long>());
+        }
+        return deviceItems.get(deviceId);
+    }
+
+    public Set<Long> getAllDeviceItems(long deviceId) {
+        if (!deviceItemsWithGroups.containsKey(deviceId)) {
+            deviceItemsWithGroups.put(deviceId, new HashSet<Long>());
+        }
+        return deviceItemsWithGroups.get(deviceId);
+    }
+
+    @Override
+    public void removeItem(long itemId) throws SQLException {
+        super.removeItem(itemId);
+        refreshExtendedPermissions();
+    }
+
+    public void refreshExtendedPermissions() {
+        if (getDataManager() != null) {
+            try {
+
+                Collection<Permission> databaseGroupPermissions =
+                        getDataManager().getPermissions(Group.class, getBaseClass());
+
+                groupItems.clear();
+                for (Permission groupPermission : databaseGroupPermissions) {
+                    getGroupItems(groupPermission.getOwnerId()).add(groupPermission.getPropertyId());
+                }
+
+                Collection<Permission> databaseDevicePermissions =
+                        getDataManager().getPermissions(Device.class, getBaseClass());
+
+                deviceItems.clear();
+                deviceItemsWithGroups.clear();
+
+                for (Permission devicePermission : databaseDevicePermissions) {
+                    getDeviceItems(devicePermission.getOwnerId()).add(devicePermission.getPropertyId());
+                    getAllDeviceItems(devicePermission.getOwnerId()).add(devicePermission.getPropertyId());
+                }
+
+                for (Device device : Context.getDeviceManager().getAllDevices()) {
+                    long groupId = device.getGroupId();
+                    while (groupId != 0) {
+                        getAllDeviceItems(device.getId()).addAll(getGroupItems(groupId));
+                        Group group = (Group) Context.getGroupsManager().getById(groupId);
+                        if (group != null) {
+                            groupId = group.getGroupId();
+                        } else {
+                            groupId = 0;
+                        }
+                    }
+                }
+
+            } catch (SQLException | ClassNotFoundException error) {
+                Log.warning(error);
+            }
+        }
+    }
+}
diff --git a/src/org/traccar/database/GeofenceManager.java b/src/org/traccar/database/GeofenceManager.java
index b8e6a5d73..a32847cf9 100644
--- a/src/org/traccar/database/GeofenceManager.java
+++ b/src/org/traccar/database/GeofenceManager.java
@@ -15,290 +15,52 @@
  */
 package org.traccar.database;
 
-import java.sql.SQLException;
 import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.LinkedList;
 import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 import org.traccar.Context;
-import org.traccar.helper.Log;
 import org.traccar.model.Device;
-import org.traccar.model.DeviceGeofence;
 import org.traccar.model.Geofence;
-import org.traccar.model.GeofencePermission;
-import org.traccar.model.GroupGeofence;
 import org.traccar.model.Position;
 
-public class GeofenceManager {
-
-    private final DataManager dataManager;
-
-    private final Map<Long, Geofence> geofences = new HashMap<>();
-    private final Map<Long, Set<Long>> userGeofences = new HashMap<>();
-    private final Map<Long, Set<Long>> groupGeofences = new HashMap<>();
-
-    private final Map<Long, Set<Long>> deviceGeofencesWithGroups = new HashMap<>();
-    private final Map<Long, Set<Long>> deviceGeofences = new HashMap<>();
-
-    private final ReadWriteLock deviceGeofencesLock = new ReentrantReadWriteLock();
-    private final ReadWriteLock geofencesLock = new ReentrantReadWriteLock();
-    private final ReadWriteLock groupGeofencesLock = new ReentrantReadWriteLock();
-    private final ReadWriteLock userGeofencesLock = new ReentrantReadWriteLock();
+public class GeofenceManager extends ExtendedObjectManager<Geofence> {
 
     public GeofenceManager(DataManager dataManager) {
-        this.dataManager = dataManager;
-        refreshGeofences();
-    }
-
-    private Set<Long> getUserGeofences(long userId) {
-        if (!userGeofences.containsKey(userId)) {
-            userGeofences.put(userId, new HashSet<Long>());
-        }
-        return userGeofences.get(userId);
-    }
-
-    public Set<Long> getUserGeofencesIds(long userId) {
-        userGeofencesLock.readLock().lock();
-        try {
-            return getUserGeofences(userId);
-        } finally {
-            userGeofencesLock.readLock().unlock();
-        }
-    }
-
-    private Set<Long> getGroupGeofences(long groupId) {
-        if (!groupGeofences.containsKey(groupId)) {
-            groupGeofences.put(groupId, new HashSet<Long>());
-        }
-        return groupGeofences.get(groupId);
-    }
-
-    public Set<Long> getGroupGeofencesIds(long groupId) {
-        groupGeofencesLock.readLock().lock();
-        try {
-            return getGroupGeofences(groupId);
-        } finally {
-            groupGeofencesLock.readLock().unlock();
-        }
-    }
-
-    public Set<Long> getAllDeviceGeofences(long deviceId) {
-        deviceGeofencesLock.readLock().lock();
-        try {
-            return getDeviceGeofences(deviceGeofencesWithGroups, deviceId);
-        } finally {
-            deviceGeofencesLock.readLock().unlock();
-        }
+        super(dataManager, Geofence.class);
     }
 
-    public Set<Long> getDeviceGeofencesIds(long deviceId) {
-        deviceGeofencesLock.readLock().lock();
-        try {
-            return getDeviceGeofences(deviceGeofences, deviceId);
-        } finally {
-            deviceGeofencesLock.readLock().unlock();
-        }
+    @Override
+    public final void refreshExtendedPermissions() {
+        super.refreshExtendedPermissions();
+        recalculateDevicesGeofences();
     }
 
-    private Set<Long> getDeviceGeofences(Map<Long, Set<Long>> deviceGeofences, long deviceId) {
-        if (!deviceGeofences.containsKey(deviceId)) {
-            deviceGeofences.put(deviceId, new HashSet<Long>());
-        }
-        return deviceGeofences.get(deviceId);
-    }
-
-    public final void refreshGeofences() {
-        if (dataManager != null) {
-            try {
-                geofencesLock.writeLock().lock();
-                try {
-                    geofences.clear();
-                    for (Geofence geofence : dataManager.getGeofences()) {
-                        geofences.put(geofence.getId(), geofence);
-                    }
-                } finally {
-                    geofencesLock.writeLock().unlock();
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-        refreshUserGeofences();
-        refresh();
-    }
-
-    public final void refreshUserGeofences() {
-        if (dataManager != null) {
-            try {
-                userGeofencesLock.writeLock().lock();
-                try {
-                    userGeofences.clear();
-                    for (GeofencePermission geofencePermission : dataManager.getGeofencePermissions()) {
-                        getUserGeofences(geofencePermission.getUserId()).add(geofencePermission.getGeofenceId());
-                    }
-                } finally {
-                    userGeofencesLock.writeLock().unlock();
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-    }
-
-    public final void refresh() {
-        if (dataManager != null) {
-            try {
-
-                Collection<GroupGeofence> databaseGroupGeofences = dataManager.getGroupGeofences();
-                groupGeofencesLock.writeLock().lock();
-                try {
-                    groupGeofences.clear();
-                    for (GroupGeofence groupGeofence : databaseGroupGeofences) {
-                        getGroupGeofences(groupGeofence.getGroupId()).add(groupGeofence.getGeofenceId());
-                    }
-                } finally {
-                    groupGeofencesLock.writeLock().unlock();
-                }
-
-                Collection<DeviceGeofence> databaseDeviceGeofences = dataManager.getDeviceGeofences();
-                Collection<Device> allDevices = Context.getDeviceManager().getAllDevices();
-
-                groupGeofencesLock.readLock().lock();
-                deviceGeofencesLock.writeLock().lock();
-                try {
-                    deviceGeofences.clear();
-                    deviceGeofencesWithGroups.clear();
-
-                    for (DeviceGeofence deviceGeofence : databaseDeviceGeofences) {
-                        getDeviceGeofences(deviceGeofences, deviceGeofence.getDeviceId())
-                            .add(deviceGeofence.getGeofenceId());
-                        getDeviceGeofences(deviceGeofencesWithGroups, deviceGeofence.getDeviceId())
-                            .add(deviceGeofence.getGeofenceId());
-                    }
-
-                    for (Device device : allDevices) {
-                        long groupId = device.getGroupId();
-                        while (groupId != 0) {
-                            getDeviceGeofences(deviceGeofencesWithGroups,
-                                    device.getId()).addAll(getGroupGeofences(groupId));
-                            if (Context.getDeviceManager().getGroupById(groupId) != null) {
-                                groupId = Context.getDeviceManager().getGroupById(groupId).getGroupId();
-                            } else {
-                                groupId = 0;
-                            }
-                        }
-                        List<Long> deviceGeofenceIds = device.getGeofenceIds();
-                        if (deviceGeofenceIds == null) {
-                            deviceGeofenceIds = new ArrayList<>();
-                        } else {
-                            deviceGeofenceIds.clear();
-                        }
-                        Position lastPosition = Context.getIdentityManager().getLastPosition(device.getId());
-                        if (lastPosition != null && deviceGeofencesWithGroups.containsKey(device.getId())) {
-                            for (long geofenceId : deviceGeofencesWithGroups.get(device.getId())) {
-                                Geofence geofence = getGeofence(geofenceId);
-                                if (geofence != null && geofence.getGeometry()
-                                        .containsPoint(lastPosition.getLatitude(), lastPosition.getLongitude())) {
-                                    deviceGeofenceIds.add(geofenceId);
-                                }
-                            }
-                        }
-                        device.setGeofenceIds(deviceGeofenceIds);
-                    }
-
-                } finally {
-                    deviceGeofencesLock.writeLock().unlock();
-                    groupGeofencesLock.readLock().unlock();
-                }
-
-            } catch (SQLException error) {
-                Log.warning(error);
+    public List<Long> getCurrentDeviceGeofences(Position position) {
+        List<Long> result = new ArrayList<>();
+        for (long geofenceId : getAllDeviceItems(position.getDeviceId())) {
+            Geofence geofence = getById(geofenceId);
+            if (geofence != null && geofence.getGeometry()
+                    .containsPoint(position.getLatitude(), position.getLongitude())) {
+                result.add(geofenceId);
             }
         }
+        return result;
     }
 
-    public final Collection<Geofence> getAllGeofences() {
-        geofencesLock.readLock().lock();
-        try {
-            return geofences.values();
-        } finally {
-            geofencesLock.readLock().unlock();
-        }
-    }
-
-    public final Set<Long> getAllGeofencesIds() {
-        geofencesLock.readLock().lock();
-        try {
-            return geofences.keySet();
-        } finally {
-            geofencesLock.readLock().unlock();
-        }
-    }
-
-    public final Set<Long> getManagedGeofencesIds(long userId) {
-        Set<Long> geofences = new HashSet<>();
-        geofences.addAll(getUserGeofencesIds(userId));
-        for (long managedUserId : Context.getPermissionsManager().getUserPermissions(userId)) {
-            geofences.addAll(getUserGeofencesIds(managedUserId));
-        }
-        return geofences;
-    }
-
-    public final Collection<Geofence> getGeofences(Set<Long> geofencesIds) {
-        geofencesLock.readLock().lock();
-        try {
-            Collection<Geofence> result = new LinkedList<>();
-            for (long geofenceId : geofencesIds) {
-                result.add(getGeofence(geofenceId));
+    public void recalculateDevicesGeofences() {
+        for (Device device : Context.getDeviceManager().getAllDevices()) {
+            List<Long> deviceGeofenceIds = device.getGeofenceIds();
+            if (deviceGeofenceIds == null) {
+                deviceGeofenceIds = new ArrayList<>();
+            } else {
+                deviceGeofenceIds.clear();
             }
-            return result;
-        } finally {
-            geofencesLock.readLock().unlock();
-        }
-    }
-
-    public final Geofence getGeofence(long geofenceId) {
-        geofencesLock.readLock().lock();
-        try {
-            return geofences.get(geofenceId);
-        } finally {
-            geofencesLock.readLock().unlock();
-        }
-    }
-
-    public final void updateGeofence(Geofence geofence) {
-        geofencesLock.writeLock().lock();
-        try {
-            geofences.put(geofence.getId(), geofence);
-        } finally {
-            geofencesLock.writeLock().unlock();
-        }
-        try {
-            dataManager.updateGeofence(geofence);
-        } catch (SQLException error) {
-            Log.warning(error);
-        }
-    }
-
-    public boolean checkGeofence(long userId, long geofenceId) {
-        return getUserGeofencesIds(userId).contains(geofenceId);
-    }
-
-    public List<Long> getCurrentDeviceGeofences(Position position) {
-        List<Long> result = new ArrayList<>();
-        for (long geofenceId : getAllDeviceGeofences(position.getDeviceId())) {
-            if (getGeofence(geofenceId).getGeometry().containsPoint(position.getLatitude(), position.getLongitude())) {
-                result.add(geofenceId);
+            Position lastPosition = Context.getIdentityManager().getLastPosition(device.getId());
+            if (lastPosition != null && getAllDeviceItems(device.getId()) != null) {
+                deviceGeofenceIds.addAll(getCurrentDeviceGeofences(lastPosition));
             }
+            device.setGeofenceIds(deviceGeofenceIds);
         }
-        return result;
     }
 
 }
diff --git a/src/org/traccar/database/GroupsManager.java b/src/org/traccar/database/GroupsManager.java
new file mode 100644
index 000000000..c0456085b
--- /dev/null
+++ b/src/org/traccar/database/GroupsManager.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.sql.SQLException;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+
+import org.traccar.Context;
+import org.traccar.helper.Log;
+import org.traccar.model.Group;
+
+public class GroupsManager extends BaseObjectManager<Group> implements ManagableObjects {
+
+    private AtomicLong groupsLastUpdate = new AtomicLong();
+    private final long dataRefreshDelay;
+
+    public GroupsManager(DataManager dataManager) {
+        super(dataManager, Group.class);
+        dataRefreshDelay = Context.getConfig().getLong("database.refreshDelay",
+                DeviceManager.DEFAULT_REFRESH_DELAY) * 1000;
+    }
+
+    private void checkGroupCycles(Group group) {
+        Set<Long> groups = new HashSet<>();
+        while (group != null) {
+            if (groups.contains(group.getId())) {
+                throw new IllegalArgumentException("Cycle in group hierarchy");
+            }
+            groups.add(group.getId());
+            group = getById(group.getGroupId());
+        }
+    }
+
+    private void updateGroupCache(boolean force) throws SQLException {
+        long lastUpdate = groupsLastUpdate.get();
+        if ((force || System.currentTimeMillis() - lastUpdate > dataRefreshDelay)
+                && groupsLastUpdate.compareAndSet(lastUpdate, System.currentTimeMillis())) {
+            refreshItems();
+        }
+    }
+
+    @Override
+    public Set<Long> getAllItems() {
+        Set<Long> result = super.getAllItems();
+        if (result.isEmpty()) {
+            try {
+                updateGroupCache(true);
+            } catch (SQLException e) {
+                Log.warning(e);
+            }
+            result = super.getAllItems();
+        }
+        return result;
+    }
+
+    @Override
+    protected void addNewItem(Group group) {
+        checkGroupCycles(group);
+        super.addNewItem(group);
+    }
+
+    @Override
+    protected void updateCachedItem(Group group) {
+        checkGroupCycles(group);
+        super.updateCachedItem(group);
+    }
+
+    @Override
+    public Set<Long> getUserItems(long userId) {
+        if (Context.getPermissionsManager() != null) {
+            return Context.getPermissionsManager().getGroupPermissions(userId);
+        } else {
+            return new HashSet<>();
+        }
+    }
+
+    @Override
+    public Set<Long> getManagedItems(long userId) {
+        Set<Long> result = new HashSet<>();
+        result.addAll(getUserItems(userId));
+        for (long managedUserId : Context.getUsersManager().getUserItems(userId)) {
+            result.addAll(getUserItems(managedUserId));
+        }
+        return result;
+    }
+
+}
diff --git a/src/org/traccar/database/IdentityManager.java b/src/org/traccar/database/IdentityManager.java
index c8c593a54..82d905963 100644
--- a/src/org/traccar/database/IdentityManager.java
+++ b/src/org/traccar/database/IdentityManager.java
@@ -20,9 +20,9 @@ import org.traccar.model.Position;
 
 public interface IdentityManager {
 
-    Device getDeviceById(long id);
+    Device getById(long id);
 
-    Device getDeviceByUniqueId(String uniqueId) throws Exception;
+    Device getByUniqueId(String uniqueId) throws Exception;
 
     Position getLastPosition(long deviceId);
 
diff --git a/src/org/traccar/database/ManagableObjects.java b/src/org/traccar/database/ManagableObjects.java
new file mode 100644
index 000000000..ec9549493
--- /dev/null
+++ b/src/org/traccar/database/ManagableObjects.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.util.Set;
+
+public interface ManagableObjects {
+
+    Set<Long> getUserItems(long userId);
+
+    Set<Long> getManagedItems(long userId);
+
+}
diff --git a/src/org/traccar/database/NotificationManager.java b/src/org/traccar/database/NotificationManager.java
index 48caa615c..73041a23f 100644
--- a/src/org/traccar/database/NotificationManager.java
+++ b/src/org/traccar/database/NotificationManager.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Andrey Kunitsyn (andrey@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,56 +19,70 @@ package org.traccar.database;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.sql.SQLException;
-import java.util.Collection;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Set;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 import org.traccar.Context;
 import org.traccar.helper.Log;
 import org.traccar.model.Event;
 import org.traccar.model.Notification;
 import org.traccar.model.Position;
+import org.traccar.model.Typed;
 import org.traccar.notification.NotificationMail;
 import org.traccar.notification.NotificationSms;
 
-public class NotificationManager {
-
-    private final DataManager dataManager;
-
-    private final Map<Long, Set<Notification>> userNotifications = new HashMap<>();
-
-    private final ReadWriteLock notificationsLock = new ReentrantReadWriteLock();
+public class NotificationManager extends ExtendedObjectManager<Notification> {
 
     public NotificationManager(DataManager dataManager) {
-        this.dataManager = dataManager;
-        refresh();
+        super(dataManager, Notification.class);
+    }
+
+    private Set<Long> getEffectiveNotifications(long userId, long deviceId) {
+        Set<Long> result = new HashSet<>();
+        Set<Long> deviceNotifications = getAllDeviceItems(deviceId);
+        for (long itemId : getUserItems(userId)) {
+            if (getById(itemId).getAlways() || deviceNotifications.contains(itemId)) {
+                result.add(itemId);
+            }
+        }
+        return result;
     }
 
     public void updateEvent(Event event, Position position) {
         try {
-            dataManager.addEvent(event);
+            getDataManager().addObject(event);
         } catch (SQLException error) {
             Log.warning(error);
         }
 
-        Set<Long> users = Context.getPermissionsManager().getDeviceUsers(event.getDeviceId());
+        long deviceId = event.getDeviceId();
+        Set<Long> users = Context.getPermissionsManager().getDeviceUsers(deviceId);
         for (long userId : users) {
             if (event.getGeofenceId() == 0 || Context.getGeofenceManager() != null
-                    && Context.getGeofenceManager().checkGeofence(userId, event.getGeofenceId())) {
-                Notification notification = getUserNotificationByType(userId, event.getType());
-                if (notification != null) {
-                    if (notification.getWeb()) {
-                        Context.getConnectionManager().updateEvent(userId, event);
-                    }
-                    if (notification.getMail()) {
-                        NotificationMail.sendMailAsync(userId, event, position);
+                    && Context.getGeofenceManager().checkItemPermission(userId, event.getGeofenceId())) {
+                boolean sentWeb = false;
+                boolean sentMail = false;
+                boolean sentSms = Context.getSmppManager() == null;
+                for (long notificationId : getEffectiveNotifications(userId, deviceId)) {
+                    Notification notification = getById(notificationId);
+                    if (getById(notificationId).getType().equals(event.getType())) {
+                        if (!sentWeb && notification.getWeb()) {
+                            Context.getConnectionManager().updateEvent(userId, event);
+                            sentWeb = true;
+                        }
+                        if (!sentMail && notification.getMail()) {
+                            NotificationMail.sendMailAsync(userId, event, position);
+                            sentMail = true;
+                        }
+                        if (!sentSms && notification.getSms()) {
+                            NotificationSms.sendSmsAsync(userId, event, position);
+                            sentSms = true;
+                        }
                     }
-                    if (notification.getSms()) {
-                        NotificationSms.sendSmsAsync(userId, event, position);
+                    if (sentWeb && sentMail && sentSms) {
+                        break;
                     }
                 }
             }
@@ -77,141 +92,24 @@ public class NotificationManager {
         }
     }
 
-    public void updateEvents(Collection<Event> events, Position position) {
-        for (Event event : events) {
-            updateEvent(event, position);
-        }
-    }
-
-    private Set<Notification> getUserNotificationsUnsafe(long userId) {
-        if (!userNotifications.containsKey(userId)) {
-            userNotifications.put(userId, new HashSet<Notification>());
-        }
-        return userNotifications.get(userId);
-    }
-
-    public Set<Notification> getUserNotifications(long userId) {
-        notificationsLock.readLock().lock();
-        try {
-            return getUserNotificationsUnsafe(userId);
-        } finally {
-            notificationsLock.readLock().unlock();
-        }
-    }
-
-    public final void refresh() {
-        if (dataManager != null) {
-            try {
-                notificationsLock.writeLock().lock();
-                try {
-                    userNotifications.clear();
-                    for (Notification notification : dataManager.getNotifications()) {
-                        getUserNotificationsUnsafe(notification.getUserId()).add(notification);
-                    }
-                } finally {
-                    notificationsLock.writeLock().unlock();
-                }
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-        }
-    }
-
-    public Notification getUserNotificationByType(long userId, String type) {
-        notificationsLock.readLock().lock();
-        try {
-            for (Notification notification : getUserNotificationsUnsafe(userId)) {
-                if (notification.getType().equals(type)) {
-                    return notification;
-                }
-            }
-        } finally {
-            notificationsLock.readLock().unlock();
-        }
-        return null;
-    }
-
-    public void updateNotification(Notification notification) {
-        Notification cachedNotification = getUserNotificationByType(notification.getUserId(), notification.getType());
-        if (cachedNotification != null) {
-            if (cachedNotification.getWeb() != notification.getWeb()
-                    || cachedNotification.getMail() != notification.getMail()
-                    || cachedNotification.getSms() != notification.getSms()) {
-                if (!notification.getWeb() && !notification.getMail() && !notification.getSms()) {
-                    try {
-                        dataManager.removeNotification(cachedNotification);
-                    } catch (SQLException error) {
-                        Log.warning(error);
-                    }
-                    notificationsLock.writeLock().lock();
-                    try {
-                        getUserNotificationsUnsafe(notification.getUserId()).remove(cachedNotification);
-                    } finally {
-                        notificationsLock.writeLock().unlock();
-                    }
-                } else {
-                    notificationsLock.writeLock().lock();
-                    try {
-                        cachedNotification.setWeb(notification.getWeb());
-                        cachedNotification.setMail(notification.getMail());
-                        cachedNotification.setSms(notification.getSms());
-                        cachedNotification.setAttributes(notification.getAttributes());
-                    } finally {
-                        notificationsLock.writeLock().unlock();
-                    }
-                    try {
-                        dataManager.updateNotification(cachedNotification);
-                    } catch (SQLException error) {
-                        Log.warning(error);
-                    }
-                }
-            } else {
-                notification.setId(cachedNotification.getId());
-            }
-        } else if (notification.getWeb() || notification.getMail() || notification.getSms()) {
-            try {
-                dataManager.addNotification(notification);
-            } catch (SQLException error) {
-                Log.warning(error);
-            }
-            notificationsLock.writeLock().lock();
-            try {
-                getUserNotificationsUnsafe(notification.getUserId()).add(notification);
-            } finally {
-                notificationsLock.writeLock().unlock();
-            }
+    public void updateEvents(Map<Event, Position> events) {
+        for (Entry<Event, Position> event : events.entrySet()) {
+            updateEvent(event.getKey(), event.getValue());
         }
     }
 
-    public Set<Notification> getAllNotifications() {
-        Set<Notification> notifications = new HashSet<>();
-        long id = 1;
+    public Set<Typed> getAllNotificationTypes() {
+        Set<Typed> types = new HashSet<>();
         Field[] fields = Event.class.getDeclaredFields();
         for (Field field : fields) {
             if (Modifier.isStatic(field.getModifiers()) && field.getName().startsWith("TYPE_")) {
                 try {
-                    Notification notification = new Notification();
-                    notification.setType(field.get(null).toString());
-                    notification.setId(id++);
-                    notifications.add(notification);
+                    types.add(new Typed(field.get(null).toString()));
                 } catch (IllegalArgumentException | IllegalAccessException error) {
                     Log.warning(error);
                 }
             }
         }
-        return notifications;
+        return types;
     }
-
-    public Collection<Notification> getAllUserNotifications(long userId) {
-        Map<String, Notification> notifications = new HashMap<>();
-        for (Notification notification : getAllNotifications()) {
-            notification.setUserId(userId);
-            notifications.put(notification.getType(), notification);
-        }
-        for (Notification notification : getUserNotifications(userId)) {
-            notifications.put(notification.getType(), notification);
-        }
-        return notifications.values();
-    }
-
 }
diff --git a/src/org/traccar/database/PermissionsManager.java b/src/org/traccar/database/PermissionsManager.java
index 9a82efd48..07b60ba58 100644
--- a/src/org/traccar/database/PermissionsManager.java
+++ b/src/org/traccar/database/PermissionsManager.java
@@ -17,39 +17,48 @@ package org.traccar.database;
 
 import org.traccar.Context;
 import org.traccar.helper.Log;
+import org.traccar.model.Attribute;
+import org.traccar.model.BaseModel;
+import org.traccar.model.Calendar;
+import org.traccar.model.Command;
 import org.traccar.model.Device;
-import org.traccar.model.DevicePermission;
+import org.traccar.model.Driver;
+import org.traccar.model.Geofence;
 import org.traccar.model.Group;
-import org.traccar.model.GroupPermission;
+import org.traccar.model.ManagedUser;
+import org.traccar.model.Notification;
+import org.traccar.model.Permission;
 import org.traccar.model.Server;
 import org.traccar.model.User;
-import org.traccar.model.UserPermission;
 
-import java.lang.reflect.Method;
 import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.Collection;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
 
 public class PermissionsManager {
 
     private final DataManager dataManager;
+    private final UsersManager usersManager;
 
     private volatile Server server;
 
-    private final Map<Long, User> users = new ConcurrentHashMap<>();
-    private final Map<String, Long> usersTokens = new HashMap<>();
-
     private final Map<Long, Set<Long>> groupPermissions = new HashMap<>();
     private final Map<Long, Set<Long>> devicePermissions = new HashMap<>();
     private final Map<Long, Set<Long>> deviceUsers = new HashMap<>();
     private final Map<Long, Set<Long>> groupDevices = new HashMap<>();
 
-    private final Map<Long, Set<Long>> userPermissions = new HashMap<>();
+    public PermissionsManager(DataManager dataManager, UsersManager usersManager) {
+        this.dataManager = dataManager;
+        this.usersManager = usersManager;
+        refreshServer();
+        refreshDeviceAndGroupPermissions();
+    }
+
+    public User getUser(long userId) {
+        return (User) usersManager.getById(userId);
+    }
 
     public Set<Long> getGroupPermissions(long userId) {
         if (!groupPermissions.containsKey(userId)) {
@@ -79,76 +88,45 @@ public class PermissionsManager {
         return groupDevices.get(groupId);
     }
 
-    public Set<Long> getUserPermissions(long userId) {
-        if (!userPermissions.containsKey(userId)) {
-            userPermissions.put(userId, new HashSet<Long>());
-        }
-        return userPermissions.get(userId);
-    }
-
-    public PermissionsManager(DataManager dataManager) {
-        this.dataManager = dataManager;
-        refreshUsers();
-        refreshPermissions();
-        refreshUserPermissions();
-    }
-
-    public final void refreshUsers() {
-        users.clear();
-        usersTokens.clear();
+    public void refreshServer() {
         try {
             server = dataManager.getServer();
-            for (User user : dataManager.getUsers()) {
-                users.put(user.getId(), user);
-                if (user.getToken() != null) {
-                    usersTokens.put(user.getToken(), user.getId());
-                }
-            }
-        } catch (SQLException error) {
-            Log.warning(error);
-        }
-    }
-
-    public final void refreshUserPermissions() {
-        userPermissions.clear();
-        try {
-            for (UserPermission permission : dataManager.getUserPermissions()) {
-                getUserPermissions(permission.getUserId()).add(permission.getManagedUserId());
-            }
         } catch (SQLException error) {
             Log.warning(error);
         }
     }
 
-    public final void refreshPermissions() {
+    public final void refreshDeviceAndGroupPermissions() {
         groupPermissions.clear();
         devicePermissions.clear();
         try {
-            GroupTree groupTree = new GroupTree(Context.getDeviceManager().getAllGroups(),
+            GroupTree groupTree = new GroupTree(Context.getGroupsManager().getItems(
+                    Context.getGroupsManager().getAllItems()),
                     Context.getDeviceManager().getAllDevices());
-            for (GroupPermission permission : dataManager.getGroupPermissions()) {
-                Set<Long> userGroupPermissions = getGroupPermissions(permission.getUserId());
-                Set<Long> userDevicePermissions = getDevicePermissions(permission.getUserId());
-                userGroupPermissions.add(permission.getGroupId());
-                for (Group group : groupTree.getGroups(permission.getGroupId())) {
+            for (Permission groupPermission : dataManager.getPermissions(User.class, Group.class)) {
+                Set<Long> userGroupPermissions = getGroupPermissions(groupPermission.getOwnerId());
+                Set<Long> userDevicePermissions = getDevicePermissions(groupPermission.getOwnerId());
+                userGroupPermissions.add(groupPermission.getPropertyId());
+                for (Group group : groupTree.getGroups(groupPermission.getPropertyId())) {
                     userGroupPermissions.add(group.getId());
                 }
-                for (Device device : groupTree.getDevices(permission.getGroupId())) {
+                for (Device device : groupTree.getDevices(groupPermission.getPropertyId())) {
                     userDevicePermissions.add(device.getId());
                 }
             }
-            for (DevicePermission permission : dataManager.getDevicePermissions()) {
-                getDevicePermissions(permission.getUserId()).add(permission.getDeviceId());
+
+            for (Permission devicePermission : dataManager.getPermissions(User.class, Device.class)) {
+                getDevicePermissions(devicePermission.getOwnerId()).add(devicePermission.getPropertyId());
             }
 
             groupDevices.clear();
-            for (Group group : Context.getDeviceManager().getAllGroups()) {
-                for (Device device : groupTree.getDevices(group.getId())) {
-                    getGroupDevices(group.getId()).add(device.getId());
+            for (long groupId : Context.getGroupsManager().getAllItems()) {
+                for (Device device : groupTree.getDevices(groupId)) {
+                    getGroupDevices(groupId).add(device.getId());
                 }
             }
 
-        } catch (SQLException error) {
+        } catch (SQLException | ClassNotFoundException error) {
             Log.warning(error);
         }
 
@@ -160,48 +138,50 @@ public class PermissionsManager {
         }
     }
 
-    public boolean isAdmin(long userId) {
-        return users.containsKey(userId) && users.get(userId).getAdmin();
+    public boolean getUserAdmin(long userId) {
+        User user = getUser(userId);
+        return user != null && user.getAdmin();
     }
 
     public void checkAdmin(long userId) throws SecurityException {
-        if (!isAdmin(userId)) {
+        if (!getUserAdmin(userId)) {
             throw new SecurityException("Admin access required");
         }
     }
 
-    public boolean isManager(long userId) {
-        return users.containsKey(userId) && users.get(userId).getUserLimit() != 0;
+    public boolean getUserManager(long userId) {
+        User user = getUser(userId);
+        return user != null && user.getUserLimit() != 0;
     }
 
     public void checkManager(long userId) throws SecurityException {
-        if (!isManager(userId)) {
+        if (!getUserManager(userId)) {
             throw new SecurityException("Manager access required");
         }
     }
 
     public void checkManager(long userId, long managedUserId) throws SecurityException {
         checkManager(userId);
-        if (!getUserPermissions(userId).contains(managedUserId)) {
+        if (!usersManager.getUserItems(userId).contains(managedUserId)) {
             throw new SecurityException("User access denied");
         }
     }
 
     public void checkUserLimit(long userId) throws SecurityException {
-        int userLimit = users.get(userId).getUserLimit();
-        if (userLimit != -1 && getUserPermissions(userId).size() >= userLimit) {
+        int userLimit = getUser(userId).getUserLimit();
+        if (userLimit != -1 && usersManager.getUserItems(userId).size() >= userLimit) {
             throw new SecurityException("Manager user limit reached");
         }
     }
 
     public void checkDeviceLimit(long userId) throws SecurityException, SQLException {
-        int deviceLimit = users.get(userId).getDeviceLimit();
+        int deviceLimit = getUser(userId).getDeviceLimit();
         if (deviceLimit != -1) {
             int deviceCount = 0;
-            if (isManager(userId)) {
-                deviceCount = Context.getDeviceManager().getManagedDevices(userId).size();
+            if (getUserManager(userId)) {
+                deviceCount = Context.getDeviceManager().getManagedItems(userId).size();
             } else {
-                deviceCount = getDevicePermissions(userId).size();
+                deviceCount = Context.getDeviceManager().getUserItems(userId).size();
             }
             if (deviceCount >= deviceLimit) {
                 throw new SecurityException("User device limit reached");
@@ -209,28 +189,50 @@ public class PermissionsManager {
         }
     }
 
-    public boolean isReadonly(long userId) {
-        return users.containsKey(userId) && users.get(userId).getReadonly();
+    public boolean getUserReadonly(long userId) {
+        User user = getUser(userId);
+        return user != null && user.getReadonly();
     }
 
-    public boolean isDeviceReadonly(long userId) {
-        return users.containsKey(userId) && users.get(userId).getDeviceReadonly();
+    public boolean getUserDeviceReadonly(long userId) {
+        User user = getUser(userId);
+        return user != null && user.getDeviceReadonly();
+    }
+
+    public boolean getUserLimitCommands(long userId) {
+        User user = getUser(userId);
+        return user != null && user.getLimitCommands();
     }
 
     public void checkReadonly(long userId) throws SecurityException {
-        if (!isAdmin(userId) && (server.getReadonly() || isReadonly(userId))) {
+        if (!getUserAdmin(userId) && (server.getReadonly() || getUserReadonly(userId))) {
             throw new SecurityException("Account is readonly");
         }
     }
 
     public void checkDeviceReadonly(long userId) throws SecurityException {
-        if (!isAdmin(userId) && (server.getDeviceReadonly() || isDeviceReadonly(userId))) {
+        if (!getUserAdmin(userId) && (server.getDeviceReadonly() || getUserDeviceReadonly(userId))) {
             throw new SecurityException("Account is device readonly");
         }
     }
 
+    public void checkLimitCommands(long userId) throws SecurityException {
+        if (!getUserAdmin(userId) && (server.getLimitCommands() || getUserLimitCommands(userId))) {
+            throw new SecurityException("Account has limit sending commands");
+        }
+    }
+
+    public void checkUserDeviceCommand(long userId, long deviceId, long commandId) throws SecurityException {
+        if (!getUserAdmin(userId) && Context.getCommandsManager().checkDeviceCommand(deviceId, commandId)) {
+            throw new SecurityException("Command can not be sent to this device");
+        }
+    }
+
     public void checkUserEnabled(long userId) throws SecurityException {
         User user = getUser(userId);
+        if (user == null) {
+            throw new SecurityException("Unknown account");
+        }
         if (user.getDisabled()) {
             throw new SecurityException("Account is disabled");
         }
@@ -245,9 +247,10 @@ public class PermissionsManager {
                 || before.getUserLimit() != after.getUserLimit()) {
             checkAdmin(userId);
         }
-        if (users.containsKey(userId) && users.get(userId).getExpirationTime() != null
+        User user = getUser(userId);
+        if (user != null && user.getExpirationTime() != null
                 && (after.getExpirationTime() == null
-                || users.get(userId).getExpirationTime().compareTo(after.getExpirationTime()) < 0)) {
+                || user.getExpirationTime().compareTo(after.getExpirationTime()) < 0)) {
             checkAdmin(userId);
         }
         if (before.getReadonly() != after.getReadonly()
@@ -256,22 +259,22 @@ public class PermissionsManager {
             if (userId == after.getId()) {
                 checkAdmin(userId);
             }
-            if (!isAdmin(userId)) {
+            if (!getUserAdmin(userId)) {
                 checkManager(userId);
             }
         }
     }
 
     public void checkUser(long userId, long managedUserId) throws SecurityException {
-        if (userId != managedUserId && !isAdmin(userId)) {
+        if (userId != managedUserId && !getUserAdmin(userId)) {
             checkManager(userId, managedUserId);
         }
     }
 
     public void checkGroup(long userId, long groupId) throws SecurityException {
-        if (!getGroupPermissions(userId).contains(groupId) && !isAdmin(userId)) {
+        if (!getGroupPermissions(userId).contains(groupId) && !getUserAdmin(userId)) {
             checkManager(userId);
-            for (long managedUserId : getUserPermissions(userId)) {
+            for (long managedUserId : usersManager.getUserItems(userId)) {
                 if (getGroupPermissions(managedUserId).contains(groupId)) {
                     return;
                 }
@@ -281,10 +284,10 @@ public class PermissionsManager {
     }
 
     public void checkDevice(long userId, long deviceId) throws SecurityException {
-        if (!getDevicePermissions(userId).contains(deviceId) && !isAdmin(userId)) {
+        if (!Context.getDeviceManager().getUserItems(userId).contains(deviceId) && !getUserAdmin(userId)) {
             checkManager(userId);
-            for (long managedUserId : getUserPermissions(userId)) {
-                if (getDevicePermissions(managedUserId).contains(deviceId)) {
+            for (long managedUserId : usersManager.getUserItems(userId)) {
+                if (Context.getDeviceManager().getUserItems(managedUserId).contains(deviceId)) {
                     return;
                 }
             }
@@ -293,44 +296,105 @@ public class PermissionsManager {
     }
 
     public void checkRegistration(long userId) {
-        if (!server.getRegistration() && !isAdmin(userId)) {
+        if (!server.getRegistration() && !getUserAdmin(userId)) {
             throw new SecurityException("Registration disabled");
         }
     }
 
-    public void checkGeofence(long userId, long geofenceId) throws SecurityException {
-        if (!Context.getGeofenceManager().checkGeofence(userId, geofenceId) && !isAdmin(userId)) {
-            checkManager(userId);
-            for (long managedUserId : getUserPermissions(userId)) {
-                if (Context.getGeofenceManager().checkGeofence(managedUserId, geofenceId)) {
-                    return;
-                }
-            }
-            throw new SecurityException("Geofence access denied");
+    public void checkPermission(Class<?> object, long userId, long objectId)
+            throws SecurityException {
+        SimpleObjectManager<? extends BaseModel> manager = null;
+
+        if (object.equals(Device.class)) {
+            checkDevice(userId, objectId);
+        } else if (object.equals(Group.class)) {
+            checkGroup(userId, objectId);
+        } else if (object.equals(User.class) || object.equals(ManagedUser.class)) {
+            checkUser(userId, objectId);
+        } else if (object.equals(Geofence.class)) {
+            manager = Context.getGeofenceManager();
+        } else if (object.equals(Attribute.class)) {
+            manager = Context.getAttributesManager();
+        } else if (object.equals(Driver.class)) {
+            manager = Context.getDriversManager();
+        } else if (object.equals(Calendar.class)) {
+            manager = Context.getCalendarManager();
+        } else if (object.equals(Command.class)) {
+            manager = Context.getCommandsManager();
+        } else if (object.equals(Notification.class)) {
+            manager = Context.getNotificationManager();
+        } else {
+            throw new IllegalArgumentException("Unknown object type");
         }
-    }
 
-    public void checkAttribute(long userId, long attributeId) throws SecurityException {
-        if (!Context.getAttributesManager().checkAttribute(userId, attributeId) && !isAdmin(userId)) {
+        if (manager != null && !manager.checkItemPermission(userId, objectId) && !getUserAdmin(userId)) {
             checkManager(userId);
-            for (long managedUserId : getUserPermissions(userId)) {
-                if (Context.getAttributesManager().checkAttribute(managedUserId, attributeId)) {
+            for (long managedUserId : usersManager.getManagedItems(userId)) {
+                if (manager.checkItemPermission(managedUserId, objectId)) {
                     return;
                 }
             }
-            throw new SecurityException("Attribute access denied");
-        }
-    }
-
-    public void checkCalendar(long userId, long calendarId) throws SecurityException {
-        if (!Context.getCalendarManager().checkCalendar(userId, calendarId) && !isAdmin(userId)) {
-            checkManager(userId);
-            for (long managedUserId : getUserPermissions(userId)) {
-                if (Context.getCalendarManager().checkCalendar(managedUserId, calendarId)) {
-                    return;
-                }
+            throw new SecurityException("Type " + object + " access denied");
+        }
+    }
+
+    public void refreshAllUsersPermissions() {
+        if (Context.getGeofenceManager() != null) {
+            Context.getGeofenceManager().refreshUserItems();
+        }
+        Context.getCalendarManager().refreshUserItems();
+        Context.getDriversManager().refreshUserItems();
+        Context.getAttributesManager().refreshUserItems();
+        Context.getCommandsManager().refreshUserItems();
+        if (Context.getNotificationManager() != null) {
+            Context.getNotificationManager().refreshUserItems();
+        }
+    }
+
+    public void refreshAllExtendedPermissions() {
+        if (Context.getGeofenceManager() != null) {
+            Context.getGeofenceManager().refreshExtendedPermissions();
+        }
+        Context.getDriversManager().refreshExtendedPermissions();
+        Context.getAttributesManager().refreshExtendedPermissions();
+        Context.getCommandsManager().refreshExtendedPermissions();
+    }
+
+    public void refreshPermissions(Permission permission) {
+        if (permission.getOwnerClass().equals(User.class)) {
+            if (permission.getPropertyClass().equals(Device.class)
+                    || permission.getPropertyClass().equals(Group.class)) {
+                refreshDeviceAndGroupPermissions();
+                refreshAllExtendedPermissions();
+            } else if (permission.getPropertyClass().equals(ManagedUser.class)) {
+                usersManager.refreshUserItems();
+            } else if (permission.getPropertyClass().equals(Geofence.class) && Context.getGeofenceManager() != null) {
+                Context.getGeofenceManager().refreshUserItems();
+            } else if (permission.getPropertyClass().equals(Driver.class)) {
+                Context.getDriversManager().refreshUserItems();
+            } else if (permission.getPropertyClass().equals(Attribute.class)) {
+                Context.getAttributesManager().refreshUserItems();
+            } else if (permission.getPropertyClass().equals(Calendar.class)) {
+                Context.getCalendarManager().refreshUserItems();
+            } else if (permission.getPropertyClass().equals(Command.class)) {
+                Context.getCommandsManager().refreshUserItems();
+            } else if (permission.getPropertyClass().equals(Notification.class)
+                    && Context.getNotificationManager() != null) {
+                Context.getNotificationManager().refreshUserItems();
+            }
+        } else if (permission.getOwnerClass().equals(Device.class) || permission.getOwnerClass().equals(Group.class)) {
+            if (permission.getPropertyClass().equals(Geofence.class) && Context.getGeofenceManager() != null) {
+                Context.getGeofenceManager().refreshExtendedPermissions();
+            } else if (permission.getPropertyClass().equals(Driver.class)) {
+                Context.getDriversManager().refreshExtendedPermissions();
+            } else if (permission.getPropertyClass().equals(Attribute.class)) {
+                Context.getAttributesManager().refreshExtendedPermissions();
+            } else if (permission.getPropertyClass().equals(Command.class)) {
+                Context.getCommandsManager().refreshExtendedPermissions();
+            } else if (permission.getPropertyClass().equals(Notification.class)
+                    && Context.getNotificationManager() != null) {
+                Context.getNotificationManager().refreshExtendedPermissions();
             }
-            throw new SecurityException("Calendar access denied");
         }
     }
 
@@ -339,94 +403,23 @@ public class PermissionsManager {
     }
 
     public void updateServer(Server server) throws SQLException {
-        dataManager.updateServer(server);
+        dataManager.updateObject(server);
         this.server = server;
     }
 
-    public Collection<User> getAllUsers() {
-        return users.values();
-    }
-
-    public Collection<User> getUsers(long userId) {
-        Collection<User> result = new ArrayList<>();
-        for (long managedUserId : getUserPermissions(userId)) {
-            result.add(users.get(managedUserId));
-        }
-        return result;
-    }
-
-    public Collection<User> getManagedUsers(long userId) {
-        Collection<User> result = getUsers(userId);
-        result.add(users.get(userId));
-        return result;
-    }
-
-    public User getUser(long userId) {
-        return users.get(userId);
-    }
-
-    public void addUser(User user) throws SQLException {
-        dataManager.addUser(user);
-        users.put(user.getId(), user);
-        if (user.getToken() != null) {
-            usersTokens.put(user.getToken(), user.getId());
-        }
-        refreshPermissions();
-    }
-
-    public void updateUser(User user) throws SQLException {
-        dataManager.updateUser(user);
-        User old = users.get(user.getId());
-        users.put(user.getId(), user);
-        if (user.getToken() != null) {
-            usersTokens.put(user.getToken(), user.getId());
-        }
-        if (old.getToken() != null && !old.getToken().equals(user.getToken())) {
-            usersTokens.remove(old.getToken());
-        }
-        refreshPermissions();
-    }
-
-    public void removeUser(long userId) throws SQLException {
-        dataManager.removeUser(userId);
-        usersTokens.remove(users.get(userId).getToken());
-        users.remove(userId);
-        refreshPermissions();
-        refreshUserPermissions();
-    }
-
     public User login(String email, String password) throws SQLException {
         User user = dataManager.login(email, password);
         if (user != null) {
             checkUserEnabled(user.getId());
-            return users.get(user.getId());
+            return getUser(user.getId());
         }
         return null;
     }
 
-    public User getUserByToken(String token) {
-        return users.get(usersTokens.get(token));
-    }
-
-    public Object lookupPreference(long userId, String key, Object defaultValue) {
-        String methodName = "get" + key.substring(0, 1).toUpperCase() + key.substring(1);
+    public Object lookupAttribute(long userId, String key, Object defaultValue) {
         Object preference;
-        Object serverPreference = null;
-        Object userPreference = null;
-        try {
-            Method method = null;
-            method = User.class.getMethod(methodName, (Class<?>[]) null);
-            if (method != null) {
-                userPreference = method.invoke(users.get(userId), (Object[]) null);
-            }
-            method = null;
-            method = Server.class.getMethod(methodName, (Class<?>[]) null);
-            if (method != null) {
-                serverPreference = method.invoke(server, (Object[]) null);
-            }
-        } catch (ReflectiveOperationException | SecurityException | IllegalArgumentException exception) {
-            return defaultValue;
-        }
+        Object serverPreference = server.getAttributes().get(key);
+        Object userPreference = getUser(userId).getAttributes().get(key);
         if (server.getForceSettings()) {
             preference = serverPreference != null ? serverPreference : userPreference;
         } else {
diff --git a/src/org/traccar/database/QueryBuilder.java b/src/org/traccar/database/QueryBuilder.java
index a24e6f0bf..af33458a8 100644
--- a/src/org/traccar/database/QueryBuilder.java
+++ b/src/org/traccar/database/QueryBuilder.java
@@ -19,6 +19,7 @@ import com.fasterxml.jackson.core.JsonProcessingException;
 import org.traccar.Context;
 import org.traccar.helper.Log;
 import org.traccar.model.MiscFormatter;
+import org.traccar.model.Permission;
 
 import javax.sql.DataSource;
 import java.io.IOException;
@@ -35,6 +36,7 @@ import java.sql.Types;
 import java.util.Collection;
 import java.util.Date;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -487,4 +489,28 @@ public final class QueryBuilder {
         return 0;
     }
 
+    public Collection<Permission> executePermissionsQuery() throws SQLException, ClassNotFoundException {
+        List<Permission> result = new LinkedList<>();
+        if (query != null) {
+            try {
+                try (ResultSet resultSet = statement.executeQuery()) {
+                    ResultSetMetaData resultMetaData = resultSet.getMetaData();
+                    while (resultSet.next()) {
+                        LinkedHashMap<String, Long> map = new LinkedHashMap<>();
+                        for (int i = 1; i <= resultMetaData.getColumnCount(); i++) {
+                            String label = resultMetaData.getColumnLabel(i);
+                            map.put(label, resultSet.getLong(label));
+                        }
+                        result.add(new Permission(map));
+                    }
+                }
+            } finally {
+                statement.close();
+                connection.close();
+            }
+        }
+
+        return result;
+    }
+
 }
diff --git a/src/org/traccar/model/UserPermission.java b/src/org/traccar/database/QueryExtended.java
index 39ead5ef1..07bc2c211 100644
--- a/src/org/traccar/model/UserPermission.java
+++ b/src/org/traccar/database/QueryExtended.java
@@ -14,28 +14,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.traccar.model;
+package org.traccar.database;
 
-public class UserPermission {
-
-    private long userId;
-
-    public long getUserId() {
-        return userId;
-    }
-
-    public void setUserId(long userId) {
-        this.userId = userId;
-    }
-
-    private long managedUserId;
-
-    public long getManagedUserId() {
-        return managedUserId;
-    }
-
-    public void setManagedUserId(long managedUserId) {
-        this.managedUserId = managedUserId;
-    }
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface QueryExtended {
 }
diff --git a/src/org/traccar/database/SimpleObjectManager.java b/src/org/traccar/database/SimpleObjectManager.java
new file mode 100644
index 000000000..0b4d11378
--- /dev/null
+++ b/src/org/traccar/database/SimpleObjectManager.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.sql.SQLException;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.traccar.Context;
+import org.traccar.helper.Log;
+import org.traccar.model.BaseModel;
+import org.traccar.model.Permission;
+import org.traccar.model.User;
+
+public abstract class SimpleObjectManager<T extends BaseModel> extends BaseObjectManager<T>
+        implements ManagableObjects {
+
+    private Map<Long, Set<Long>> userItems;
+
+    protected SimpleObjectManager(DataManager dataManager, Class<T> baseClass) {
+        super(dataManager, baseClass);
+    }
+
+    @Override
+    public final Set<Long> getUserItems(long userId) {
+        if (!userItems.containsKey(userId)) {
+            userItems.put(userId, new HashSet<Long>());
+        }
+        return userItems.get(userId);
+    }
+
+    @Override
+    public Set<Long> getManagedItems(long userId) {
+        Set<Long> result = new HashSet<>();
+        result.addAll(getUserItems(userId));
+        for (long managedUserId : Context.getUsersManager().getUserItems(userId)) {
+            result.addAll(getUserItems(managedUserId));
+        }
+        return result;
+    }
+
+    public final boolean checkItemPermission(long userId, long itemId) {
+        return getUserItems(userId).contains(itemId);
+    }
+
+    @Override
+    public void refreshItems() {
+        super.refreshItems();
+        refreshUserItems();
+    }
+
+    public final void refreshUserItems() {
+        if (getDataManager() != null) {
+            try {
+                if (userItems != null) {
+                    userItems.clear();
+                } else {
+                    userItems = new ConcurrentHashMap<>();
+                }
+                for (Permission permission : getDataManager().getPermissions(User.class, getBaseClass())) {
+                    getUserItems(permission.getOwnerId()).add(permission.getPropertyId());
+                }
+            } catch (SQLException | ClassNotFoundException error) {
+                Log.warning(error);
+            }
+        }
+    }
+
+    @Override
+    public void removeItem(long itemId) throws SQLException {
+        super.removeItem(itemId);
+        refreshUserItems();
+    }
+
+}
diff --git a/src/org/traccar/database/StatisticsManager.java b/src/org/traccar/database/StatisticsManager.java
index 5b42416ad..06a3e7b35 100644
--- a/src/org/traccar/database/StatisticsManager.java
+++ b/src/org/traccar/database/StatisticsManager.java
@@ -61,7 +61,7 @@ public class StatisticsManager {
             statistics.setGeolocationRequests(geolocationRequests);
 
             try {
-                Context.getDataManager().addStatistics(statistics);
+                Context.getDataManager().addObject(statistics);
             } catch (SQLException e) {
                 Log.warning(e);
             }
diff --git a/src/org/traccar/database/UsersManager.java b/src/org/traccar/database/UsersManager.java
new file mode 100644
index 000000000..576a9e6c7
--- /dev/null
+++ b/src/org/traccar/database/UsersManager.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.database;
+
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.traccar.model.User;
+
+public class UsersManager extends SimpleObjectManager<User> {
+
+    private Map<String, User> usersTokens;
+
+    public UsersManager(DataManager dataManager) {
+        super(dataManager, User.class);
+        if (usersTokens == null) {
+            usersTokens = new ConcurrentHashMap<>();
+        }
+    }
+
+    private void putToken(User user) {
+        if (usersTokens == null) {
+            usersTokens = new ConcurrentHashMap<>();
+        }
+        if (user.getToken() != null) {
+            usersTokens.put(user.getToken(), user);
+        }
+    }
+
+    @Override
+    protected void addNewItem(User user) {
+        super.addNewItem(user);
+        putToken(user);
+    }
+
+    @Override
+    protected void updateCachedItem(User user) {
+        User cachedUser = getById(user.getId());
+        super.updateCachedItem(user);
+        putToken(user);
+        if (cachedUser.getToken() != null && !cachedUser.getToken().equals(user.getToken())) {
+            usersTokens.remove(cachedUser.getToken());
+        }
+    }
+
+    @Override
+    protected void removeCachedItem(long userId) {
+        User cachedUser = getById(userId);
+        if (cachedUser != null) {
+            String userToken = cachedUser.getToken();
+            super.removeCachedItem(userId);
+            if (userToken != null) {
+                usersTokens.remove(userToken);
+            }
+        }
+    }
+
+    @Override
+    public Set<Long> getManagedItems(long userId) {
+        Set<Long> result = new HashSet<>();
+        result.addAll(getUserItems(userId));
+        result.add(userId);
+        return result;
+    }
+
+    public User getUserByToken(String token) {
+        return usersTokens.get(token);
+    }
+
+}
diff --git a/src/org/traccar/events/AlertEventHandler.java b/src/org/traccar/events/AlertEventHandler.java
index 7d0bd669b..003ccb662 100644
--- a/src/org/traccar/events/AlertEventHandler.java
+++ b/src/org/traccar/events/AlertEventHandler.java
@@ -15,8 +15,8 @@
  */
 package org.traccar.events;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.model.Event;
@@ -25,12 +25,12 @@ import org.traccar.model.Position;
 public class AlertEventHandler extends BaseEventHandler {
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
+    protected Map<Event, Position> analyzePosition(Position position) {
         Object alarm = position.getAttributes().get(Position.KEY_ALARM);
         if (alarm != null) {
             Event event = new Event(Event.TYPE_ALARM, position.getDeviceId(), position.getId());
             event.set(Position.KEY_ALARM, (String) alarm);
-            return Collections.singleton(event);
+            return Collections.singletonMap(event, position);
         }
         return null;
     }
diff --git a/src/org/traccar/events/CommandResultEventHandler.java b/src/org/traccar/events/CommandResultEventHandler.java
index 077c389c9..775aa903f 100644
--- a/src/org/traccar/events/CommandResultEventHandler.java
+++ b/src/org/traccar/events/CommandResultEventHandler.java
@@ -15,8 +15,8 @@
  */
 package org.traccar.events;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.model.Event;
@@ -25,12 +25,12 @@ import org.traccar.model.Position;
 public class CommandResultEventHandler extends BaseEventHandler {
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
+    protected Map<Event, Position> analyzePosition(Position position) {
         Object commandResult = position.getAttributes().get(Position.KEY_RESULT);
         if (commandResult != null) {
             Event event = new Event(Event.TYPE_COMMAND_RESULT, position.getDeviceId(), position.getId());
             event.set(Position.KEY_RESULT, (String) commandResult);
-            return Collections.singleton(event);
+            return Collections.singletonMap(event, position);
         }
         return null;
     }
diff --git a/src/org/traccar/events/DriverEventHandler.java b/src/org/traccar/events/DriverEventHandler.java
new file mode 100644
index 000000000..39b8eb9c0
--- /dev/null
+++ b/src/org/traccar/events/DriverEventHandler.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.events;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.traccar.BaseEventHandler;
+import org.traccar.Context;
+import org.traccar.model.Event;
+import org.traccar.model.Position;
+
+public class DriverEventHandler extends BaseEventHandler {
+
+    @Override
+    protected Map<Event, Position> analyzePosition(Position position) {
+        if (!Context.getIdentityManager().isLatestPosition(position)) {
+            return null;
+        }
+        String driverUniqueId = position.getString(Position.KEY_DRIVER_UNIQUE_ID);
+        if (driverUniqueId != null) {
+            String oldDriverUniqueId = null;
+            Position lastPosition = Context.getIdentityManager().getLastPosition(position.getDeviceId());
+            if (lastPosition != null) {
+                oldDriverUniqueId = lastPosition.getString(Position.KEY_DRIVER_UNIQUE_ID);
+            }
+            if (!driverUniqueId.equals(oldDriverUniqueId)) {
+                Event event = new Event(Event.TYPE_DRIVER_CHANGED, position.getDeviceId(), position.getId());
+                event.set(Position.KEY_DRIVER_UNIQUE_ID, driverUniqueId);
+                return Collections.singletonMap(event, position);
+            }
+        }
+        return null;
+    }
+
+}
diff --git a/src/org/traccar/events/FuelDropEventHandler.java b/src/org/traccar/events/FuelDropEventHandler.java
index e9a261aea..2ee3e1a58 100644
--- a/src/org/traccar/events/FuelDropEventHandler.java
+++ b/src/org/traccar/events/FuelDropEventHandler.java
@@ -21,21 +21,21 @@ import org.traccar.model.Device;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 public class FuelDropEventHandler extends BaseEventHandler {
 
     public static final String ATTRIBUTE_FUEL_DROP_THRESHOLD = "fuelDropThreshold";
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
+    protected Map<Event, Position> analyzePosition(Position position) {
 
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+        Device device = Context.getIdentityManager().getById(position.getDeviceId());
         if (device == null) {
             return null;
         }
-        if (!Context.getIdentityManager().isLatestPosition(position) || !position.getValid()) {
+        if (!Context.getIdentityManager().isLatestPosition(position)) {
             return null;
         }
 
@@ -52,7 +52,7 @@ public class FuelDropEventHandler extends BaseEventHandler {
                 if (drop >= fuelDropThreshold) {
                     Event event = new Event(Event.TYPE_DEVICE_FUEL_DROP, position.getDeviceId(), position.getId());
                     event.set(ATTRIBUTE_FUEL_DROP_THRESHOLD, fuelDropThreshold);
-                    return Collections.singleton(event);
+                    return Collections.singletonMap(event, position);
                 }
             }
         }
diff --git a/src/org/traccar/events/GeofenceEventHandler.java b/src/org/traccar/events/GeofenceEventHandler.java
index fbec932b1..31d82a81e 100644
--- a/src/org/traccar/events/GeofenceEventHandler.java
+++ b/src/org/traccar/events/GeofenceEventHandler.java
@@ -16,12 +16,14 @@
 package org.traccar.events;
 
 import java.util.ArrayList;
-import java.util.Collection;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.Context;
 import org.traccar.database.GeofenceManager;
+import org.traccar.model.Calendar;
 import org.traccar.model.Device;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -35,8 +37,8 @@ public class GeofenceEventHandler extends BaseEventHandler {
     }
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+    protected Map<Event, Position> analyzePosition(Position position) {
+        Device device = Context.getIdentityManager().getById(position.getDeviceId());
         if (device == null) {
             return null;
         }
@@ -55,23 +57,23 @@ public class GeofenceEventHandler extends BaseEventHandler {
 
         device.setGeofenceIds(currentGeofences);
 
-        Collection<Event> events = new ArrayList<>();
+        Map<Event, Position> events = new HashMap<>();
         for (long geofenceId : newGeofences) {
-            long calendarId = geofenceManager.getGeofence(geofenceId).getCalendarId();
-            if (calendarId == 0 || Context.getCalendarManager().getCalendar(calendarId) == null
-                    || Context.getCalendarManager().getCalendar(calendarId).checkMoment(position.getFixTime())) {
+            long calendarId = geofenceManager.getById(geofenceId).getCalendarId();
+            Calendar calendar = calendarId != 0 ? Context.getCalendarManager().getById(calendarId) : null;
+            if (calendar == null || calendar.checkMoment(position.getFixTime())) {
                 Event event = new Event(Event.TYPE_GEOFENCE_ENTER, position.getDeviceId(), position.getId());
                 event.setGeofenceId(geofenceId);
-                events.add(event);
+                events.put(event, position);
             }
         }
         for (long geofenceId : oldGeofences) {
-            long calendarId = geofenceManager.getGeofence(geofenceId).getCalendarId();
-            if (calendarId == 0 || Context.getCalendarManager().getCalendar(calendarId) == null
-                    || Context.getCalendarManager().getCalendar(calendarId).checkMoment(position.getFixTime())) {
+            long calendarId = geofenceManager.getById(geofenceId).getCalendarId();
+            Calendar calendar = calendarId != 0 ? Context.getCalendarManager().getById(calendarId) : null;
+            if (calendar == null || calendar.checkMoment(position.getFixTime())) {
                 Event event = new Event(Event.TYPE_GEOFENCE_EXIT, position.getDeviceId(), position.getId());
                 event.setGeofenceId(geofenceId);
-                events.add(event);
+                events.put(event, position);
             }
         }
         return events;
diff --git a/src/org/traccar/events/IgnitionEventHandler.java b/src/org/traccar/events/IgnitionEventHandler.java
index c628cc107..cc53b216c 100644
--- a/src/org/traccar/events/IgnitionEventHandler.java
+++ b/src/org/traccar/events/IgnitionEventHandler.java
@@ -16,8 +16,8 @@
  */
 package org.traccar.events;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.Context;
@@ -28,13 +28,13 @@ import org.traccar.model.Position;
 public class IgnitionEventHandler extends BaseEventHandler {
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+    protected Map<Event, Position> analyzePosition(Position position) {
+        Device device = Context.getIdentityManager().getById(position.getDeviceId());
         if (device == null || !Context.getIdentityManager().isLatestPosition(position)) {
             return null;
         }
 
-        Collection<Event> result = null;
+        Map<Event, Position> result = null;
 
         if (position.getAttributes().containsKey(Position.KEY_IGNITION)) {
             boolean ignition = position.getBoolean(Position.KEY_IGNITION);
@@ -44,11 +44,11 @@ public class IgnitionEventHandler extends BaseEventHandler {
                 boolean oldIgnition = lastPosition.getBoolean(Position.KEY_IGNITION);
 
                 if (ignition && !oldIgnition) {
-                    result = Collections.singleton(
-                            new Event(Event.TYPE_IGNITION_ON, position.getDeviceId(), position.getId()));
+                    result = Collections.singletonMap(
+                            new Event(Event.TYPE_IGNITION_ON, position.getDeviceId(), position.getId()), position);
                 } else if (!ignition && oldIgnition) {
-                    result = Collections.singleton(
-                            new Event(Event.TYPE_IGNITION_OFF, position.getDeviceId(), position.getId()));
+                    result = Collections.singletonMap(
+                            new Event(Event.TYPE_IGNITION_OFF, position.getDeviceId(), position.getId()), position);
                 }
             }
         }
diff --git a/src/org/traccar/events/MaintenanceEventHandler.java b/src/org/traccar/events/MaintenanceEventHandler.java
index 86836f6af..86abf7c17 100644
--- a/src/org/traccar/events/MaintenanceEventHandler.java
+++ b/src/org/traccar/events/MaintenanceEventHandler.java
@@ -16,8 +16,8 @@
  */
 package org.traccar.events;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.Context;
@@ -31,8 +31,8 @@ public class MaintenanceEventHandler extends BaseEventHandler {
     public static final String ATTRIBUTE_MAINTENANCE_INTERVAL = "maintenance.interval";
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+    protected Map<Event, Position> analyzePosition(Position position) {
+        Device device = Context.getIdentityManager().getById(position.getDeviceId());
         if (device == null || !Context.getIdentityManager().isLatestPosition(position)) {
             return null;
         }
@@ -60,7 +60,7 @@ public class MaintenanceEventHandler extends BaseEventHandler {
         if ((long) (oldTotalDistance / maintenanceInterval) < (long) (newTotalDistance / maintenanceInterval)) {
             Event event = new Event(Event.TYPE_MAINTENANCE, position.getDeviceId(), position.getId());
             event.set(Position.KEY_TOTAL_DISTANCE, newTotalDistance);
-            return Collections.singleton(event);
+            return Collections.singletonMap(event, position);
         }
 
         return null;
diff --git a/src/org/traccar/events/MotionEventHandler.java b/src/org/traccar/events/MotionEventHandler.java
index e6fd10f3e..0c1c4848f 100644
--- a/src/org/traccar/events/MotionEventHandler.java
+++ b/src/org/traccar/events/MotionEventHandler.java
@@ -1,5 +1,6 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,42 +16,114 @@
  */
 package org.traccar.events;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.Context;
 import org.traccar.model.Device;
+import org.traccar.model.DeviceState;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
+import org.traccar.reports.ReportUtils;
+import org.traccar.reports.model.TripsConfig;
 
 public class MotionEventHandler extends BaseEventHandler {
 
+    private TripsConfig tripsConfig;
+
+    public MotionEventHandler(TripsConfig tripsConfig) {
+        this.tripsConfig = tripsConfig;
+    }
+
+    private Map<Event, Position> newEvent(DeviceState deviceState, boolean newMotion) {
+        String eventType = newMotion ? Event.TYPE_DEVICE_MOVING : Event.TYPE_DEVICE_STOPPED;
+        Position position = deviceState.getMotionPosition();
+        Event event = new Event(eventType, position.getDeviceId(), position.getId());
+        deviceState.setMotionState(newMotion);
+        deviceState.setMotionPosition(null);
+        return Collections.singletonMap(event, position);
+    }
+
+    public Map<Event, Position> updateMotionState(DeviceState deviceState) {
+        Map<Event, Position> result = null;
+        if (deviceState.getMotionState() != null && deviceState.getMotionPosition() != null) {
+            boolean newMotion = !deviceState.getMotionState();
+            Position motionPosition = deviceState.getMotionPosition();
+            long currentTime = System.currentTimeMillis();
+            long motionTime = motionPosition.getFixTime().getTime()
+                    + (newMotion ? tripsConfig.getMinimalTripDuration() : tripsConfig.getMinimalParkingDuration());
+            if (motionTime <= currentTime) {
+                result = newEvent(deviceState, newMotion);
+            }
+        }
+        return result;
+    }
+
+    public Map<Event, Position> updateMotionState(DeviceState deviceState, Position position) {
+        return updateMotionState(deviceState, position, position.getBoolean(Position.KEY_MOTION));
+    }
+
+    public Map<Event, Position> updateMotionState(DeviceState deviceState, Position position, boolean newMotion) {
+        Map<Event, Position> result = null;
+        Boolean oldMotion = deviceState.getMotionState();
+
+        long currentTime = position.getFixTime().getTime();
+        if (newMotion != oldMotion) {
+            if (deviceState.getMotionPosition() == null) {
+                deviceState.setMotionPosition(position);
+            }
+        } else {
+            deviceState.setMotionPosition(null);
+        }
+
+        Position motionPosition = deviceState.getMotionPosition();
+        if (motionPosition != null) {
+            long motionTime = motionPosition.getFixTime().getTime();
+            double distance = ReportUtils.calculateDistance(motionPosition, position, false);
+            Boolean ignition = null;
+            if (tripsConfig.getUseIgnition()
+                    && position.getAttributes().containsKey(Position.KEY_IGNITION)) {
+                ignition = position.getBoolean(Position.KEY_IGNITION);
+            }
+            if (newMotion) {
+                if (motionTime + tripsConfig.getMinimalTripDuration() <= currentTime
+                        || distance >= tripsConfig.getMinimalTripDistance()) {
+                    result = newEvent(deviceState, newMotion);
+                }
+            } else {
+                if (motionTime + tripsConfig.getMinimalParkingDuration() <= currentTime
+                        || ignition != null && !ignition) {
+                    result = newEvent(deviceState, newMotion);
+                }
+            }
+        }
+        return result;
+    }
+
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
+    protected Map<Event, Position> analyzePosition(Position position) {
 
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+        long deviceId = position.getDeviceId();
+        Device device = Context.getIdentityManager().getById(deviceId);
         if (device == null) {
             return null;
         }
-        if (!Context.getIdentityManager().isLatestPosition(position) || !position.getValid()) {
+        if (!Context.getIdentityManager().isLatestPosition(position)
+                || !tripsConfig.getProcessInvalidPositions() && !position.getValid()) {
             return null;
         }
 
-        boolean motion = position.getBoolean(Position.KEY_MOTION);
-        boolean oldMotion = false;
-        Position lastPosition = Context.getIdentityManager().getLastPosition(position.getDeviceId());
-        if (lastPosition != null) {
-            oldMotion = lastPosition.getBoolean(Position.KEY_MOTION);
-        }
-        if (motion && !oldMotion) {
-            return Collections.singleton(
-                    new Event(Event.TYPE_DEVICE_MOVING, position.getDeviceId(), position.getId()));
-        } else if (!motion && oldMotion) {
-            return Collections.singleton(
-                    new Event(Event.TYPE_DEVICE_STOPPED, position.getDeviceId(), position.getId()));
+        Map<Event, Position> result = null;
+        DeviceState deviceState = Context.getDeviceManager().getDeviceState(deviceId);
+
+        if (deviceState.getMotionState() == null) {
+            deviceState.setMotionState(position.getBoolean(Position.KEY_MOTION));
+        } else {
+            result = updateMotionState(deviceState, position);
         }
-        return null;
+        Context.getDeviceManager().setDeviceState(deviceId, deviceState);
+        return result;
     }
 
 }
diff --git a/src/org/traccar/events/OverspeedEventHandler.java b/src/org/traccar/events/OverspeedEventHandler.java
index 00c3845d2..cb658415c 100644
--- a/src/org/traccar/events/OverspeedEventHandler.java
+++ b/src/org/traccar/events/OverspeedEventHandler.java
@@ -15,12 +15,13 @@
  */
 package org.traccar.events;
 
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Map;
 
 import org.traccar.BaseEventHandler;
 import org.traccar.Context;
 import org.traccar.model.Device;
+import org.traccar.model.DeviceState;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
 
@@ -29,15 +30,69 @@ public class OverspeedEventHandler extends BaseEventHandler {
     public static final String ATTRIBUTE_SPEED_LIMIT = "speedLimit";
 
     private boolean notRepeat;
+    private long minimalDuration;
 
-    public OverspeedEventHandler() {
-        notRepeat = Context.getConfig().getBoolean("event.overspeed.notRepeat");
+    public OverspeedEventHandler(long minimalDuration, boolean notRepeat) {
+        this.notRepeat = notRepeat;
+        this.minimalDuration = minimalDuration;
+    }
+
+    private Map<Event, Position> newEvent(DeviceState deviceState, double speedLimit) {
+        Position position = deviceState.getOverspeedPosition();
+        Event event = new Event(Event.TYPE_DEVICE_OVERSPEED, position.getDeviceId(), position.getId());
+        event.set("speed", deviceState.getOverspeedPosition().getSpeed());
+        event.set(ATTRIBUTE_SPEED_LIMIT, speedLimit);
+        deviceState.setOverspeedState(notRepeat);
+        deviceState.setOverspeedPosition(null);
+        return Collections.singletonMap(event, position);
+    }
+
+    public Map<Event, Position> updateOverspeedState(DeviceState deviceState, double speedLimit) {
+        Map<Event, Position> result = null;
+        if (deviceState.getOverspeedState() != null && !deviceState.getOverspeedState()
+                && deviceState.getOverspeedPosition() != null && speedLimit != 0) {
+            long currentTime = System.currentTimeMillis();
+            Position overspeedPosition = deviceState.getOverspeedPosition();
+            long overspeedTime = overspeedPosition.getFixTime().getTime();
+            if (overspeedTime + minimalDuration <= currentTime) {
+                result = newEvent(deviceState, speedLimit);
+            }
+        }
+        return result;
+    }
+
+    public Map<Event, Position> updateOverspeedState(DeviceState deviceState, Position position, double speedLimit) {
+        Map<Event, Position> result = null;
+
+        Boolean oldOverspeed = deviceState.getOverspeedState();
+
+        long currentTime = position.getFixTime().getTime();
+        boolean newOverspeed = position.getSpeed() > speedLimit;
+        if (newOverspeed && !oldOverspeed) {
+            if (deviceState.getOverspeedPosition() == null) {
+                deviceState.setOverspeedPosition(position);
+            }
+        } else if (oldOverspeed && !newOverspeed) {
+            deviceState.setOverspeedState(false);
+            deviceState.setOverspeedPosition(null);
+        } else {
+            deviceState.setOverspeedPosition(null);
+        }
+        Position overspeedPosition = deviceState.getOverspeedPosition();
+        if (overspeedPosition != null) {
+            long overspeedTime = overspeedPosition.getFixTime().getTime();
+            if (newOverspeed && overspeedTime + minimalDuration <= currentTime) {
+                result = newEvent(deviceState, speedLimit);
+            }
+        }
+        return result;
     }
 
     @Override
-    protected Collection<Event> analyzePosition(Position position) {
+    protected Map<Event, Position> analyzePosition(Position position) {
 
-        Device device = Context.getIdentityManager().getDeviceById(position.getDeviceId());
+        long deviceId = position.getDeviceId();
+        Device device = Context.getIdentityManager().getById(deviceId);
         if (device == null) {
             return null;
         }
@@ -45,26 +100,22 @@ public class OverspeedEventHandler extends BaseEventHandler {
             return null;
         }
 
-        double speed = position.getSpeed();
-        double speedLimit = Context.getDeviceManager()
-                .lookupAttributeDouble(device.getId(), ATTRIBUTE_SPEED_LIMIT, 0, false);
+        double speedLimit = Context.getDeviceManager().lookupAttributeDouble(deviceId, ATTRIBUTE_SPEED_LIMIT, 0, false);
         if (speedLimit == 0) {
             return null;
         }
-        double oldSpeed = 0;
-        if (notRepeat) {
-            Position lastPosition = Context.getIdentityManager().getLastPosition(position.getDeviceId());
-            if (lastPosition != null) {
-                oldSpeed = lastPosition.getSpeed();
-            }
-        }
-        if (speed > speedLimit && oldSpeed <= speedLimit) {
-            Event event = new Event(Event.TYPE_DEVICE_OVERSPEED, position.getDeviceId(), position.getId());
-            event.set("speed", speed);
-            event.set(ATTRIBUTE_SPEED_LIMIT, speedLimit);
-            return Collections.singleton(event);
+
+        Map<Event, Position> result = null;
+        DeviceState deviceState = Context.getDeviceManager().getDeviceState(deviceId);
+
+        if (deviceState.getOverspeedState() == null) {
+            deviceState.setOverspeedState(position.getSpeed() > speedLimit);
+        } else {
+            result = updateOverspeedState(deviceState, position, speedLimit);
         }
-        return null;
+
+        Context.getDeviceManager().setDeviceState(deviceId, deviceState);
+        return result;
     }
 
 }
diff --git a/src/org/traccar/helper/BitBuffer.java b/src/org/traccar/helper/BitBuffer.java
index 7626988cc..ac307efdf 100644
--- a/src/org/traccar/helper/BitBuffer.java
+++ b/src/org/traccar/helper/BitBuffer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,7 @@ import org.jboss.netty.buffer.ChannelBuffers;
 
 public class BitBuffer {
 
-    private ChannelBuffer buffer = ChannelBuffers.dynamicBuffer();
+    private final ChannelBuffer buffer;
 
     private int writeByte;
     private int writeCount;
@@ -28,6 +28,14 @@ public class BitBuffer {
     private int readByte;
     private int readCount;
 
+    public BitBuffer() {
+        buffer = ChannelBuffers.dynamicBuffer();
+    }
+
+    public BitBuffer(ChannelBuffer buffer) {
+        this.buffer = buffer;
+    }
+
     public void writeEncoded(byte[] bytes) {
         for (byte b : bytes) {
             b -= 48;
diff --git a/src/org/traccar/helper/PatternUtil.java b/src/org/traccar/helper/PatternUtil.java
index 12536eaef..1bbb166a6 100644
--- a/src/org/traccar/helper/PatternUtil.java
+++ b/src/org/traccar/helper/PatternUtil.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,7 @@
  */
 package org.traccar.helper;
 
+import java.lang.management.ManagementFactory;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.regex.PatternSyntaxException;
@@ -49,6 +50,10 @@ public final class PatternUtil {
 
     public static MatchResult checkPattern(String pattern, String input) {
 
+        if (!ManagementFactory.getRuntimeMXBean().getInputArguments().toString().contains("-agentlib:jdwp")) {
+            throw new RuntimeException("PatternUtil usage detected");
+        }
+
         MatchResult result = new MatchResult();
 
         for (int i = 0; i < pattern.length(); i++) {
diff --git a/src/org/traccar/model/Attribute.java b/src/org/traccar/model/Attribute.java
index 9c3b5e43b..45d40b3ec 100644
--- a/src/org/traccar/model/Attribute.java
+++ b/src/org/traccar/model/Attribute.java
@@ -16,17 +16,7 @@
  */
 package org.traccar.model;
 
-public class Attribute {
-
-    private long id;
-
-    public long getId() {
-        return id;
-    }
-
-    public void setId(long id) {
-        this.id = id;
-    }
+public class Attribute extends BaseModel {
 
     private String description;
 
diff --git a/src/org/traccar/model/AttributeAlias.java b/src/org/traccar/model/AttributeAlias.java
deleted file mode 100644
index 2835c0558..000000000
--- a/src/org/traccar/model/AttributeAlias.java
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class AttributeAlias {
-
-    private long id;
-
-    public long getId() {
-        return id;
-    }
-
-    public void setId(long id) {
-        this.id = id;
-    }
-
-    private long deviceId;
-
-    public long getDeviceId() {
-        return deviceId;
-    }
-
-    public void setDeviceId(long deviceId) {
-        this.deviceId = deviceId;
-    }
-
-    private String attribute;
-
-    public String getAttribute() {
-        return attribute;
-    }
-
-    public void setAttribute(String attribute) {
-        this.attribute = attribute;
-    }
-
-    private String alias;
-
-    public String getAlias() {
-        return alias;
-    }
-
-    public void setAlias(String alias) {
-        this.alias = alias;
-    }
-
-}
diff --git a/src/org/traccar/model/GroupAttribute.java b/src/org/traccar/model/BaseModel.java
index a7e8a80bc..8bdb916e8 100644
--- a/src/org/traccar/model/GroupAttribute.java
+++ b/src/org/traccar/model/BaseModel.java
@@ -16,25 +16,16 @@
  */
 package org.traccar.model;
 
-public class GroupAttribute {
+public class BaseModel {
 
-    private long groupId;
+    private long id;
 
-    public long getGroupId() {
-        return groupId;
+    public final long getId() {
+        return id;
     }
 
-    public void setGroupId(long groupId) {
-        this.groupId = groupId;
+    public final void setId(long id) {
+        this.id = id;
     }
 
-    private long attributeId;
-
-    public long getAttributeId() {
-        return attributeId;
-    }
-
-    public void setAttributeId(long attributeId) {
-        this.attributeId = attributeId;
-    }
 }
diff --git a/src/org/traccar/model/Calendar.java b/src/org/traccar/model/Calendar.java
index 55f696d50..56d3eb74c 100644
--- a/src/org/traccar/model/Calendar.java
+++ b/src/org/traccar/model/Calendar.java
@@ -27,14 +27,14 @@ import net.fortuna.ical4j.data.CalendarBuilder;
 import net.fortuna.ical4j.data.ParserException;
 import net.fortuna.ical4j.filter.Filter;
 import net.fortuna.ical4j.filter.PeriodRule;
-import net.fortuna.ical4j.filter.Rule;
 import net.fortuna.ical4j.model.DateTime;
 import net.fortuna.ical4j.model.Dur;
 import net.fortuna.ical4j.model.Period;
 import net.fortuna.ical4j.model.component.CalendarComponent;
+import org.apache.commons.collections4.Predicate;
 import org.traccar.database.QueryIgnore;
 
-public class Calendar extends Extensible {
+public class Calendar extends ExtendedModel {
 
     private String name;
 
@@ -69,8 +69,8 @@ public class Calendar extends Extensible {
     public boolean checkMoment(Date date) {
         if (calendar != null) {
             Period period = new Period(new DateTime(date), new Dur(0, 0, 0, 0));
-            Rule<CalendarComponent> periodRule = new PeriodRule<>(period);
-            Filter<CalendarComponent> filter = new Filter<>(new Rule[] {periodRule}, Filter.MATCH_ANY);
+            Predicate<CalendarComponent> periodRule = new PeriodRule<>(period);
+            Filter<CalendarComponent> filter = new Filter<>(new Predicate[] {periodRule}, Filter.MATCH_ANY);
             Collection<CalendarComponent> events = filter.filter(calendar.getComponents(CalendarComponent.VEVENT));
             if (events != null && !events.isEmpty()) {
                 return true;
diff --git a/src/org/traccar/model/CalendarPermission.java b/src/org/traccar/model/CalendarPermission.java
deleted file mode 100644
index 59f54e07b..000000000
--- a/src/org/traccar/model/CalendarPermission.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class CalendarPermission {
-
-    private long userId;
-
-    public long getUserId() {
-        return userId;
-    }
-
-    public void setUserId(long userId) {
-        this.userId = userId;
-    }
-
-    private long calendarId;
-
-    public long getCalendarId() {
-        return calendarId;
-    }
-
-    public void setCalendarId(long calendarId) {
-        this.calendarId = calendarId;
-    }
-}
diff --git a/src/org/traccar/model/CellTower.java b/src/org/traccar/model/CellTower.java
index 2eb56dd33..6d1dfbd7f 100644
--- a/src/org/traccar/model/CellTower.java
+++ b/src/org/traccar/model/CellTower.java
@@ -106,4 +106,10 @@ public class CellTower {
         this.signalStrength = signalStrength;
     }
 
+    public void setOperator(long operator) {
+        String operatorString = String.valueOf(operator);
+        mobileCountryCode = Integer.parseInt(operatorString.substring(0, 3));
+        mobileNetworkCode = Integer.parseInt(operatorString.substring(3));
+    }
+
 }
diff --git a/src/org/traccar/model/Command.java b/src/org/traccar/model/Command.java
index 6a48b14e9..16205ede1 100644
--- a/src/org/traccar/model/Command.java
+++ b/src/org/traccar/model/Command.java
@@ -15,10 +15,12 @@
  */
 package org.traccar.model;
 
+import org.traccar.database.QueryIgnore;
+
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
-public class Command extends Message {
+public class Command extends Message implements Cloneable {
 
     public static final String TYPE_CUSTOM = "custom";
     public static final String TYPE_IDENTIFICATION = "deviceIdentification";
@@ -75,6 +77,11 @@ public class Command extends Message {
     public static final String KEY_SERVER = "server";
     public static final String KEY_PORT = "port";
 
+    @Override
+    public Command clone() throws CloneNotSupportedException {
+        return (Command) super.clone();
+    }
+
     private boolean textChannel;
 
     public boolean getTextChannel() {
@@ -85,4 +92,20 @@ public class Command extends Message {
         this.textChannel = textChannel;
     }
 
+    @QueryIgnore
+    @Override
+    public long getDeviceId() {
+        return super.getDeviceId();
+    }
+
+    private String description;
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
 }
diff --git a/src/org/traccar/model/Device.java b/src/org/traccar/model/Device.java
index 2324da532..c8a28404c 100644
--- a/src/org/traccar/model/Device.java
+++ b/src/org/traccar/model/Device.java
@@ -18,7 +18,10 @@ package org.traccar.model;
 import java.util.Date;
 import java.util.List;
 
-public class Device extends Extensible {
+import org.traccar.database.QueryExtended;
+import org.traccar.database.QueryIgnore;
+
+public class Device extends ExtendedModel {
 
     private String name;
 
@@ -46,6 +49,7 @@ public class Device extends Extensible {
 
     private String status;
 
+    @QueryIgnore
     public String getStatus() {
         return status != null ? status : STATUS_OFFLINE;
     }
@@ -56,6 +60,7 @@ public class Device extends Extensible {
 
     private Date lastUpdate;
 
+    @QueryExtended
     public Date getLastUpdate() {
         if (lastUpdate != null) {
             return new Date(lastUpdate.getTime());
@@ -74,6 +79,7 @@ public class Device extends Extensible {
 
     private long positionId;
 
+    @QueryIgnore
     public long getPositionId() {
         return positionId;
     }
@@ -94,6 +100,7 @@ public class Device extends Extensible {
 
     private List<Long> geofenceIds;
 
+    @QueryIgnore
     public List<Long> getGeofenceIds() {
         return geofenceIds;
     }
diff --git a/src/org/traccar/model/DeviceGeofence.java b/src/org/traccar/model/DeviceGeofence.java
deleted file mode 100644
index 00c99add6..000000000
--- a/src/org/traccar/model/DeviceGeofence.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class DeviceGeofence {
-
-    private long deviceId;
-
-    public long getDeviceId() {
-        return deviceId;
-    }
-
-    public void setDeviceId(long deviceId) {
-        this.deviceId = deviceId;
-    }
-
-    private long geofenceId;
-
-    public long getGeofenceId() {
-        return geofenceId;
-    }
-
-    public void setGeofenceId(long geofenceId) {
-        this.geofenceId = geofenceId;
-    }
-
-}
diff --git a/src/org/traccar/model/DevicePermission.java b/src/org/traccar/model/DevicePermission.java
deleted file mode 100644
index c62173132..000000000
--- a/src/org/traccar/model/DevicePermission.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class DevicePermission {
-
-    private long userId;
-
-    public long getUserId() {
-        return userId;
-    }
-
-    public void setUserId(long userId) {
-        this.userId = userId;
-    }
-
-    private long deviceId;
-
-    public long getDeviceId() {
-        return deviceId;
-    }
-
-    public void setDeviceId(long deviceId) {
-        this.deviceId = deviceId;
-    }
-
-}
diff --git a/src/org/traccar/model/DeviceState.java b/src/org/traccar/model/DeviceState.java
new file mode 100644
index 000000000..f2d0ff614
--- /dev/null
+++ b/src/org/traccar/model/DeviceState.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.model;
+
+public class DeviceState {
+
+    private Boolean motionState;
+
+    public void setMotionState(boolean motionState) {
+        this.motionState = motionState;
+    }
+
+    public Boolean getMotionState() {
+        return motionState;
+    }
+
+    private Position motionPosition;
+
+    public void setMotionPosition(Position motionPosition) {
+        this.motionPosition = motionPosition;
+    }
+
+    public Position getMotionPosition() {
+        return motionPosition;
+    }
+
+    private Boolean overspeedState;
+
+    public void setOverspeedState(boolean overspeedState) {
+        this.overspeedState = overspeedState;
+    }
+
+    public Boolean getOverspeedState() {
+        return overspeedState;
+    }
+
+    private Position overspeedPosition;
+
+    public void setOverspeedPosition(Position overspeedPosition) {
+        this.overspeedPosition = overspeedPosition;
+    }
+
+    public Position getOverspeedPosition() {
+        return overspeedPosition;
+    }
+
+}
diff --git a/src/org/traccar/model/AttributePermission.java b/src/org/traccar/model/Driver.java
index fe2fe7b6e..05f52fd4d 100644
--- a/src/org/traccar/model/AttributePermission.java
+++ b/src/org/traccar/model/Driver.java
@@ -16,26 +16,25 @@
  */
 package org.traccar.model;
 
-public class AttributePermission {
+public class Driver extends ExtendedModel {
 
-    private long userId;
+    private String name;
 
-    public long getUserId() {
-        return userId;
+    public String getName() {
+        return name;
     }
 
-    public void setUserId(long userId) {
-        this.userId = userId;
+    public void setName(String name) {
+        this.name = name;
     }
 
-    private long attributeId;
+    private String uniqueId;
 
-    public long getAttributeId() {
-        return attributeId;
+    public String getUniqueId() {
+        return uniqueId;
     }
 
-    public void setAttributeId(long attributeId) {
-        this.attributeId = attributeId;
+    public void setUniqueId(String uniqueId) {
+        this.uniqueId = uniqueId;
     }
-
 }
diff --git a/src/org/traccar/model/Event.java b/src/org/traccar/model/Event.java
index 6a24d91c6..47b60af01 100644
--- a/src/org/traccar/model/Event.java
+++ b/src/org/traccar/model/Event.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,15 +20,13 @@ import java.util.Date;
 public class Event extends Message {
 
     public Event(String type, long deviceId, long positionId) {
-        this.setType(type);
-        this.setDeviceId(deviceId);
-        this.setPositionId(positionId);
-        this.serverTime = new Date();
+        this(type, deviceId);
+        setPositionId(positionId);
     }
 
     public Event(String type, long deviceId) {
-        this.setType(type);
-        this.setDeviceId(deviceId);
+        setType(type);
+        setDeviceId(deviceId);
         this.serverTime = new Date();
     }
 
@@ -61,6 +59,8 @@ public class Event extends Message {
 
     public static final String TYPE_TEXT_MESSAGE = "textMessage";
 
+    public static final String TYPE_DRIVER_CHANGED = "driverChanged";
+
     private Date serverTime;
 
     public Date getServerTime() {
diff --git a/src/org/traccar/model/Extensible.java b/src/org/traccar/model/ExtendedModel.java
index b7953d8a6..8353d0e66 100644
--- a/src/org/traccar/model/Extensible.java
+++ b/src/org/traccar/model/ExtendedModel.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,17 +18,7 @@ package org.traccar.model;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-public class Extensible {
-
-    private long id;
-
-    public long getId() {
-        return id;
-    }
-
-    public void setId(long id) {
-        this.id = id;
-    }
+public class ExtendedModel extends BaseModel {
 
     private Map<String, Object> attributes = new LinkedHashMap<>();
 
@@ -41,7 +31,9 @@ public class Extensible {
     }
 
     public void set(String key, Boolean value) {
-        attributes.put(key, value);
+        if (value != null) {
+            attributes.put(key, value);
+        }
     }
 
     public void set(String key, Byte value) {
@@ -110,7 +102,7 @@ public class Extensible {
 
     public boolean getBoolean(String key) {
         if (attributes.containsKey(key)) {
-            return Boolean.parseBoolean(attributes.get(key).toString());
+            return (Boolean) attributes.get(key);
         } else {
             return false;
         }
diff --git a/src/org/traccar/model/Geofence.java b/src/org/traccar/model/Geofence.java
index dfb888852..21c196da9 100644
--- a/src/org/traccar/model/Geofence.java
+++ b/src/org/traccar/model/Geofence.java
@@ -26,7 +26,7 @@ import org.traccar.geofence.GeofencePolyline;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 
-public class Geofence extends Extensible {
+public class Geofence extends ExtendedModel {
 
     public static final String TYPE_GEOFENCE_CILCLE = "geofenceCircle";
     public static final String TYPE_GEOFENCE_POLYGON = "geofencePolygon";
diff --git a/src/org/traccar/model/GeofencePermission.java b/src/org/traccar/model/GeofencePermission.java
deleted file mode 100644
index 464f4e9eb..000000000
--- a/src/org/traccar/model/GeofencePermission.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class GeofencePermission {
-
-    private long userId;
-
-    public long getUserId() {
-        return userId;
-    }
-
-    public void setUserId(long userId) {
-        this.userId = userId;
-    }
-
-    private long geofenceId;
-
-    public long getGeofenceId() {
-        return geofenceId;
-    }
-
-    public void setGeofenceId(long geofenceId) {
-        this.geofenceId = geofenceId;
-    }
-
-}
diff --git a/src/org/traccar/model/Group.java b/src/org/traccar/model/Group.java
index c21d43127..aad206aad 100644
--- a/src/org/traccar/model/Group.java
+++ b/src/org/traccar/model/Group.java
@@ -15,7 +15,7 @@
  */
 package org.traccar.model;
 
-public class Group extends Extensible {
+public class Group extends ExtendedModel {
 
     private String name;
 
diff --git a/src/org/traccar/model/GroupGeofence.java b/src/org/traccar/model/GroupGeofence.java
deleted file mode 100644
index 736e6c704..000000000
--- a/src/org/traccar/model/GroupGeofence.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class GroupGeofence {
-
-    private long groupId;
-
-    public long getGroupId() {
-        return groupId;
-    }
-
-    public void setGroupId(long groupId) {
-        this.groupId = groupId;
-    }
-
-    private long geofenceId;
-
-    public long getGeofenceId() {
-        return geofenceId;
-    }
-
-    public void setGeofenceId(long geofenceId) {
-        this.geofenceId = geofenceId;
-    }
-
-}
diff --git a/src/org/traccar/model/GroupPermission.java b/src/org/traccar/model/GroupPermission.java
deleted file mode 100644
index 59b41b049..000000000
--- a/src/org/traccar/model/GroupPermission.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.traccar.model;
-
-public class GroupPermission {
-
-    private long userId;
-
-    public long getUserId() {
-        return userId;
-    }
-
-    public void setUserId(long userId) {
-        this.userId = userId;
-    }
-
-    private long groupId;
-
-    public long getGroupId() {
-        return groupId;
-    }
-
-    public void setGroupId(long groupId) {
-        this.groupId = groupId;
-    }
-
-}
diff --git a/src/org/traccar/model/DeviceAttribute.java b/src/org/traccar/model/ManagedUser.java
index e0ac6dd98..03c5ef48d 100644
--- a/src/org/traccar/model/DeviceAttribute.java
+++ b/src/org/traccar/model/ManagedUser.java
@@ -16,25 +16,6 @@
  */
 package org.traccar.model;
 
-public class DeviceAttribute {
+public class ManagedUser extends User {
 
-    private long deviceId;
-
-    public long getDeviceId() {
-        return deviceId;
-    }
-
-    public void setDeviceId(long deviceId) {
-        this.deviceId = deviceId;
-    }
-
-    private long attributeId;
-
-    public long getAttributeId() {
-        return attributeId;
-    }
-
-    public void setAttributeId(long attributeId) {
-        this.attributeId = attributeId;
-    }
 }
diff --git a/src/org/traccar/model/Message.java b/src/org/traccar/model/Message.java
index ab472202b..dad9c20f0 100644
--- a/src/org/traccar/model/Message.java
+++ b/src/org/traccar/model/Message.java
@@ -15,7 +15,7 @@
  */
 package org.traccar.model;
 
-public class Message extends Extensible {
+public class Message extends ExtendedModel {
 
     private long deviceId;
 
diff --git a/src/org/traccar/model/Notification.java b/src/org/traccar/model/Notification.java
index 6c61cafaf..9d6034fff 100644
--- a/src/org/traccar/model/Notification.java
+++ b/src/org/traccar/model/Notification.java
@@ -15,16 +15,16 @@
  */
 package org.traccar.model;
 
-public class Notification extends Extensible {
+public class Notification extends ExtendedModel {
 
-    private long userId;
+    private boolean always;
 
-    public long getUserId() {
-        return userId;
+    public boolean getAlways() {
+        return always;
     }
 
-    public void setUserId(long userId) {
-        this.userId = userId;
+    public void setAlways(boolean always) {
+        this.always = always;
     }
 
     private String type;
diff --git a/src/org/traccar/model/Permission.java b/src/org/traccar/model/Permission.java
new file mode 100644
index 000000000..1006b1c47
--- /dev/null
+++ b/src/org/traccar/model/Permission.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.model;
+
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.traccar.database.DataManager;
+
+public class Permission {
+
+    private Class<?> ownerClass;
+    private long ownerId;
+    private Class<?> propertyClass;
+    private long propertyId;
+
+    public Permission(LinkedHashMap<String, Long> permissionMap) throws ClassNotFoundException {
+        Iterator<Map.Entry<String, Long>> iterator = permissionMap.entrySet().iterator();
+        String owner = iterator.next().getKey();
+        ownerClass = DataManager.getClassByName(owner);
+        String property = iterator.next().getKey();
+        propertyClass = DataManager.getClassByName(property);
+        ownerId = permissionMap.get(owner);
+        propertyId = permissionMap.get(property);
+    }
+
+    public Class<?> getOwnerClass() {
+        return ownerClass;
+    }
+
+    public long getOwnerId() {
+        return ownerId;
+    }
+
+    public Class<?> getPropertyClass() {
+        return propertyClass;
+    }
+
+    public long getPropertyId() {
+        return propertyId;
+    }
+}
diff --git a/src/org/traccar/model/Position.java b/src/org/traccar/model/Position.java
index 5835310ae..099e6d686 100644
--- a/src/org/traccar/model/Position.java
+++ b/src/org/traccar/model/Position.java
@@ -17,6 +17,8 @@ package org.traccar.model;
 
 import java.util.Date;
 
+import org.traccar.database.QueryIgnore;
+
 public class Position extends Message {
 
     public static final String KEY_ORIGINAL = "raw";
@@ -28,6 +30,7 @@ public class Position extends Message {
     public static final String KEY_SATELLITES_VISIBLE = "satVisible";
     public static final String KEY_RSSI = "rssi";
     public static final String KEY_GPS = "gps";
+    public static final String KEY_ROAMING = "roaming";
     public static final String KEY_EVENT = "event";
     public static final String KEY_ALARM = "alarm";
     public static final String KEY_STATUS = "status";
@@ -35,6 +38,7 @@ public class Position extends Message {
     public static final String KEY_ODOMETER_SERVICE = "serviceOdometer"; // meters
     public static final String KEY_ODOMETER_TRIP = "tripOdometer"; // meters
     public static final String KEY_HOURS = "hours";
+    public static final String KEY_STEPS = "steps";
     public static final String KEY_INPUT = "input";
     public static final String KEY_OUTPUT = "output";
     public static final String KEY_IMAGE = "image";
@@ -49,7 +53,6 @@ public class Position extends Message {
     public static final String KEY_FUEL_LEVEL = "fuel"; // liters
     public static final String KEY_FUEL_CONSUMPTION = "fuelConsumption"; // liters/hour
 
-    public static final String KEY_RFID = "rfid";
     public static final String KEY_VERSION_FW = "versionFw";
     public static final String KEY_VERSION_HW = "versionHw";
     public static final String KEY_TYPE = "type";
@@ -74,6 +77,7 @@ public class Position extends Message {
     public static final String KEY_OPERATOR = "operator";
     public static final String KEY_COMMAND = "command";
     public static final String KEY_BLOCKED = "blocked";
+    public static final String KEY_DOOR = "door";
 
     public static final String KEY_DTCS = "dtcs";
     public static final String KEY_OBD_SPEED = "obdSpeed"; // knots
@@ -81,6 +85,8 @@ public class Position extends Message {
 
     public static final String KEY_RESULT = "result";
 
+    public static final String KEY_DRIVER_UNIQUE_ID = "driverUniqueId";
+
     // Start with 1 not 0
     public static final String PREFIX_TEMP = "temp";
     public static final String PREFIX_ADC = "adc";
@@ -109,7 +115,8 @@ public class Position extends Message {
     public static final String ALARM_ACCIDENT = "accident";
     public static final String ALARM_TOW = "tow";
     public static final String ALARM_ACCELERATION = "hardAcceleration";
-    public static final String ALARM_BREAKING = "hardBreaking";
+    public static final String ALARM_BRAKING = "hardBraking";
+    public static final String ALARM_CORNERING = "hardCornering";
     public static final String ALARM_FATIGUE_DRIVING = "fatigueDriving";
     public static final String ALARM_POWER_CUT = "powerCut";
     public static final String ALARM_POWER_RESTORED = "powerRestored";
@@ -194,6 +201,7 @@ public class Position extends Message {
 
     private boolean outdated;
 
+    @QueryIgnore
     public boolean getOutdated() {
         return outdated;
     }
@@ -292,4 +300,10 @@ public class Position extends Message {
         this.network = network;
     }
 
+    @Override
+    @QueryIgnore
+    public String getType() {
+        return super.getType();
+    }
+
 }
diff --git a/src/org/traccar/model/Server.java b/src/org/traccar/model/Server.java
index 4ded65204..072e85d55 100644
--- a/src/org/traccar/model/Server.java
+++ b/src/org/traccar/model/Server.java
@@ -15,12 +15,12 @@
  */
 package org.traccar.model;
 
-import java.util.TimeZone;
-
+import org.traccar.database.QueryIgnore;
 import org.traccar.helper.Log;
 
-public class Server extends Extensible {
+public class Server extends ExtendedModel {
 
+    @QueryIgnore
     public String getVersion() {
         return Log.getAppVersion();
     }
@@ -88,26 +88,6 @@ public class Server extends Extensible {
         this.mapUrl = mapUrl;
     }
 
-    private String distanceUnit;
-
-    public String getDistanceUnit() {
-        return distanceUnit;
-    }
-
-    public void setDistanceUnit(String distanceUnit) {
-        this.distanceUnit = distanceUnit;
-    }
-
-    private String speedUnit;
-
-    public String getSpeedUnit() {
-        return speedUnit;
-    }
-
-    public void setSpeedUnit(String speedUnit) {
-        this.speedUnit = speedUnit;
-    }
-
     private double latitude;
 
     public double getLatitude() {
@@ -168,13 +148,13 @@ public class Server extends Extensible {
         this.coordinateFormat = coordinateFormat;
     }
 
-    private String timezone;
+    private boolean limitCommands;
 
-    public void setTimezone(String timezone) {
-        this.timezone = timezone != null ? TimeZone.getTimeZone(timezone).getID() : null;
+    public boolean getLimitCommands() {
+        return limitCommands;
     }
 
-    public String getTimezone() {
-        return timezone;
+    public void setLimitCommands(boolean limitCommands) {
+        this.limitCommands = limitCommands;
     }
 }
diff --git a/src/org/traccar/model/Statistics.java b/src/org/traccar/model/Statistics.java
index c7ae5af7a..2acf8514f 100644
--- a/src/org/traccar/model/Statistics.java
+++ b/src/org/traccar/model/Statistics.java
@@ -17,7 +17,7 @@ package org.traccar.model;
 
 import java.util.Date;
 
-public class Statistics extends Extensible {
+public class Statistics extends ExtendedModel {
 
     private Date captureTime;
 
diff --git a/src/org/traccar/model/CommandType.java b/src/org/traccar/model/Typed.java
index 210316f71..313ec7bcd 100644
--- a/src/org/traccar/model/CommandType.java
+++ b/src/org/traccar/model/Typed.java
@@ -15,11 +15,11 @@
  */
 package org.traccar.model;
 
-public class CommandType {
+public class Typed {
 
     private String type;
 
-    public CommandType(String type) {
+    public Typed(String type) {
         this.type = type;
     }
 
diff --git a/src/org/traccar/model/User.java b/src/org/traccar/model/User.java
index 366ced503..5d89dcfae 100644
--- a/src/org/traccar/model/User.java
+++ b/src/org/traccar/model/User.java
@@ -16,12 +16,14 @@
 package org.traccar.model;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import org.traccar.database.QueryExtended;
+import org.traccar.database.QueryIgnore;
 import org.traccar.helper.Hashing;
 
 import java.util.Date;
-import java.util.TimeZone;
 
-public class User extends Extensible {
+public class User extends ExtendedModel {
 
     private String name;
 
@@ -40,7 +42,7 @@ public class User extends Extensible {
     }
 
     public void setEmail(String email) {
-        this.email = email;
+        this.email = email.trim();
     }
 
     private String phone;
@@ -83,26 +85,6 @@ public class User extends Extensible {
         this.map = map;
     }
 
-    private String distanceUnit;
-
-    public String getDistanceUnit() {
-        return distanceUnit;
-    }
-
-    public void setDistanceUnit(String distanceUnit) {
-        this.distanceUnit = distanceUnit;
-    }
-
-    private String speedUnit;
-
-    public String getSpeedUnit() {
-        return speedUnit;
-    }
-
-    public void setSpeedUnit(String speedUnit) {
-        this.speedUnit = speedUnit;
-    }
-
     private double latitude;
 
     public double getLatitude() {
@@ -228,6 +210,17 @@ public class User extends Extensible {
         }
     }
 
+    private boolean limitCommands;
+
+    public boolean getLimitCommands() {
+        return limitCommands;
+    }
+
+    public void setLimitCommands(boolean limitCommands) {
+        this.limitCommands = limitCommands;
+    }
+
+    @QueryIgnore
     public String getPassword() {
         return null;
     }
@@ -243,6 +236,7 @@ public class User extends Extensible {
     private String hashedPassword;
 
     @JsonIgnore
+    @QueryExtended
     public String getHashedPassword() {
         return hashedPassword;
     }
@@ -254,6 +248,7 @@ public class User extends Extensible {
     private String salt;
 
     @JsonIgnore
+    @QueryExtended
     public String getSalt() {
         return salt;
     }
@@ -266,13 +261,4 @@ public class User extends Extensible {
         return Hashing.validatePassword(password, hashedPassword, salt);
     }
 
-    private String timezone;
-
-    public void setTimezone(String timezone) {
-        this.timezone = timezone != null ? TimeZone.getTimeZone(timezone).getID() : null;
-    }
-
-    public String getTimezone() {
-        return timezone;
-    }
 }
diff --git a/src/org/traccar/notification/EventForwarder.java b/src/org/traccar/notification/EventForwarder.java
index bd7cfc0c5..ac37f980c 100644
--- a/src/org/traccar/notification/EventForwarder.java
+++ b/src/org/traccar/notification/EventForwarder.java
@@ -69,13 +69,13 @@ public final class EventForwarder {
             data.put(KEY_POSITION, position);
         }
         if (event.getDeviceId() != 0) {
-            Device device = Context.getIdentityManager().getDeviceById(event.getDeviceId());
+            Device device = Context.getIdentityManager().getById(event.getDeviceId());
             if (device != null) {
                 data.put(KEY_DEVICE, device);
             }
         }
         if (event.getGeofenceId() != 0) {
-            Geofence geofence = Context.getGeofenceManager().getGeofence(event.getGeofenceId());
+            Geofence geofence = (Geofence) Context.getGeofenceManager().getById(event.getGeofenceId());
             if (geofence != null) {
                 data.put(KEY_GEOFENCE, geofence);
             }
diff --git a/src/org/traccar/notification/NotificationFormatter.java b/src/org/traccar/notification/NotificationFormatter.java
index 96337ecaa..8da819430 100644
--- a/src/org/traccar/notification/NotificationFormatter.java
+++ b/src/org/traccar/notification/NotificationFormatter.java
@@ -30,6 +30,7 @@ import org.traccar.helper.Log;
 import org.traccar.model.Device;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
+import org.traccar.model.User;
 import org.traccar.reports.ReportUtils;
 
 public final class NotificationFormatter {
@@ -38,17 +39,25 @@ public final class NotificationFormatter {
     }
 
     public static VelocityContext prepareContext(long userId, Event event, Position position) {
-        Device device = Context.getIdentityManager().getDeviceById(event.getDeviceId());
+        User user = Context.getPermissionsManager().getUser(userId);
+        Device device = Context.getIdentityManager().getById(event.getDeviceId());
 
         VelocityContext velocityContext = new VelocityContext();
+        velocityContext.put("user", user);
         velocityContext.put("device", device);
         velocityContext.put("event", event);
         if (position != null) {
             velocityContext.put("position", position);
-            velocityContext.put("speedUnits", ReportUtils.getSpeedUnit(userId));
+            velocityContext.put("speedUnit", ReportUtils.getSpeedUnit(userId));
+            velocityContext.put("distanceUnit", ReportUtils.getDistanceUnit(userId));
+            velocityContext.put("volumeUnit", ReportUtils.getVolumeUnit(userId));
         }
         if (event.getGeofenceId() != 0) {
-            velocityContext.put("geofence", Context.getGeofenceManager().getGeofence(event.getGeofenceId()));
+            velocityContext.put("geofence", Context.getGeofenceManager().getById(event.getGeofenceId()));
+        }
+        String driverUniqueId = event.getString(Position.KEY_DRIVER_UNIQUE_ID);
+        if (driverUniqueId != null) {
+            velocityContext.put("driver", Context.getDriversManager().getDriverByUniqueId(driverUniqueId));
         }
         velocityContext.put("webUrl", Context.getVelocityEngine().getProperty("web.url"));
         velocityContext.put("dateTool", new DateTool());
diff --git a/src/org/traccar/notification/NotificationMail.java b/src/org/traccar/notification/NotificationMail.java
index 115b109e6..8707b10da 100644
--- a/src/org/traccar/notification/NotificationMail.java
+++ b/src/org/traccar/notification/NotificationMail.java
@@ -43,7 +43,7 @@ public final class NotificationMail {
         if (host != null) {
             properties.put("mail.transport.protocol", provider.getString("mail.transport.protocol", "smtp"));
             properties.put("mail.smtp.host", host);
-            properties.put("mail.smtp.port", provider.getString("mail.smtp.port", "25"));
+            properties.put("mail.smtp.port", String.valueOf(provider.getInteger("mail.smtp.port", 25)));
 
             String starttlsEnable = provider.getString("mail.smtp.starttls.enable");
             if (starttlsEnable != null) {
@@ -68,8 +68,6 @@ public final class NotificationMail {
                 properties.put("mail.smtp.ssl.protocols", sslProtocols);
             }
 
-            properties.put("mail.smtp.auth", provider.getString("mail.smtp.auth"));
-
             String username = provider.getString("mail.smtp.username");
             if (username != null) {
                 properties.put("mail.smtp.username", username);
@@ -89,13 +87,16 @@ public final class NotificationMail {
     public static void sendMailSync(long userId, Event event, Position position) throws MessagingException {
         User user = Context.getPermissionsManager().getUser(userId);
 
-        Properties properties = getProperties(new PropertiesProvider(Context.getConfig()));
-        if (!properties.containsKey("mail.smtp.host")) {
+        Properties properties = null;
+        if (!Context.getConfig().getBoolean("mail.smtp.ignoreUserConfig")) {
             properties = getProperties(new PropertiesProvider(user));
-            if (!properties.containsKey("mail.smtp.host")) {
-                Log.warning("No SMTP configuration found");
-                return;
-            }
+        }
+        if (properties == null || !properties.containsKey("mail.smtp.host")) {
+            properties = getProperties(new PropertiesProvider(Context.getConfig()));
+        }
+        if (!properties.containsKey("mail.smtp.host")) {
+            Log.warning("No SMTP configuration found");
+            return;
         }
 
         Session session = Session.getInstance(properties);
diff --git a/src/org/traccar/notification/PropertiesProvider.java b/src/org/traccar/notification/PropertiesProvider.java
index e7cac8d0f..c5ba688e8 100644
--- a/src/org/traccar/notification/PropertiesProvider.java
+++ b/src/org/traccar/notification/PropertiesProvider.java
@@ -16,27 +16,27 @@
 package org.traccar.notification;
 
 import org.traccar.Config;
-import org.traccar.model.Extensible;
+import org.traccar.model.ExtendedModel;
 
 public class PropertiesProvider {
 
     private Config config;
 
-    private Extensible extensible;
+    private ExtendedModel extendedModel;
 
     public PropertiesProvider(Config config) {
         this.config = config;
     }
 
-    public PropertiesProvider(Extensible extensible) {
-        this.extensible = extensible;
+    public PropertiesProvider(ExtendedModel extendedModel) {
+        this.extendedModel = extendedModel;
     }
 
     public String getString(String key) {
         if (config != null) {
             return config.getString(key);
         } else {
-            return extensible.getString(key);
+            return extendedModel.getString(key);
         }
     }
 
@@ -48,4 +48,17 @@ public class PropertiesProvider {
         return value;
     }
 
+    public int getInteger(String key, int defaultValue) {
+        if (config != null) {
+            return config.getInteger(key, defaultValue);
+        } else {
+            Object result = extendedModel.getAttributes().get(key);
+            if (result != null) {
+                return result instanceof String ? Integer.parseInt((String) result) : (Integer) result;
+            } else {
+                return defaultValue;
+            }
+        }
+    }
+
 }
diff --git a/src/org/traccar/processing/ComputedAttributesHandler.java b/src/org/traccar/processing/ComputedAttributesHandler.java
index 8689c5a58..f1f371475 100644
--- a/src/org/traccar/processing/ComputedAttributesHandler.java
+++ b/src/org/traccar/processing/ComputedAttributesHandler.java
@@ -31,19 +31,33 @@ import org.traccar.BaseDataHandler;
 import org.traccar.Context;
 import org.traccar.helper.Log;
 import org.traccar.model.Attribute;
+import org.traccar.model.Device;
 import org.traccar.model.Position;
 
 public class ComputedAttributesHandler extends BaseDataHandler {
 
     private JexlEngine engine;
 
+    private boolean mapDeviceAttributes;
+
     public ComputedAttributesHandler() {
         engine = new JexlEngine();
         engine.setStrict(true);
+        if (Context.getConfig() != null) {
+            mapDeviceAttributes = Context.getConfig().getBoolean("processing.computedAttributes.deviceAttributes");
+        }
     }
 
     private MapContext prepareContext(Position position) {
         MapContext result = new MapContext();
+        if (mapDeviceAttributes) {
+            Device device = Context.getIdentityManager().getById(position.getDeviceId());
+            if (device != null) {
+                for (Object key : device.getAttributes().keySet()) {
+                    result.set((String) key, device.getAttributes().get(key));
+                }
+            }
+        }
         Set<Method> methods = new HashSet<>(Arrays.asList(position.getClass().getMethods()));
         methods.removeAll(Arrays.asList(Object.class.getMethods()));
         for (Method method : methods) {
@@ -72,8 +86,8 @@ public class ComputedAttributesHandler extends BaseDataHandler {
 
     @Override
     protected Position handlePosition(Position position) {
-        Collection<Attribute> attributes = Context.getAttributesManager().getAttributes(
-                Context.getAttributesManager().getAllDeviceAttributes(position.getDeviceId()));
+        Collection<Attribute> attributes = Context.getAttributesManager().getItems(
+                Context.getAttributesManager().getAllDeviceItems(position.getDeviceId()));
         for (Attribute attribute : attributes) {
             if (attribute.getAttribute() != null) {
                 Object result = null;
diff --git a/src/org/traccar/processing/CopyAttributesHandler.java b/src/org/traccar/processing/CopyAttributesHandler.java
index 3a96ca98d..9fbcfa73f 100644
--- a/src/org/traccar/processing/CopyAttributesHandler.java
+++ b/src/org/traccar/processing/CopyAttributesHandler.java
@@ -32,9 +32,14 @@ public class CopyAttributesHandler extends BaseDataHandler {
     @Override
     protected Position handlePosition(Position position) {
         String attributesString = Context.getDeviceManager().lookupAttributeString(
-                position.getDeviceId(), "processing.copyAttributes", null, true);
+                position.getDeviceId(), "processing.copyAttributes", "", true);
         Position last = getLastPosition(position.getDeviceId());
-        if (attributesString != null && last != null) {
+        if (attributesString.isEmpty()) {
+            attributesString = Position.KEY_DRIVER_UNIQUE_ID;
+        } else {
+            attributesString += "," + Position.KEY_DRIVER_UNIQUE_ID;
+        }
+        if (last != null) {
             for (String attribute : attributesString.split("[ ,]")) {
                 if (last.getAttributes().containsKey(attribute) && !position.getAttributes().containsKey(attribute)) {
                     position.getAttributes().put(attribute, last.getAttributes().get(attribute));
diff --git a/src/org/traccar/protocol/AdmProtocol.java b/src/org/traccar/protocol/AdmProtocol.java
index 442121f0a..4d2cbe7b3 100644
--- a/src/org/traccar/protocol/AdmProtocol.java
+++ b/src/org/traccar/protocol/AdmProtocol.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,8 +18,10 @@ package org.traccar.protocol;
 import org.jboss.netty.bootstrap.ServerBootstrap;
 import org.jboss.netty.channel.ChannelPipeline;
 import org.jboss.netty.handler.codec.frame.LengthFieldBasedFrameDecoder;
+import org.jboss.netty.handler.codec.string.StringEncoder;
 import org.traccar.BaseProtocol;
 import org.traccar.TrackerServer;
+import org.traccar.model.Command;
 
 import java.nio.ByteOrder;
 import java.util.List;
@@ -28,6 +30,9 @@ public class AdmProtocol extends BaseProtocol {
 
     public AdmProtocol() {
         super("adm");
+        setSupportedDataCommands(
+                Command.TYPE_GET_DEVICE_STATUS,
+                Command.TYPE_CUSTOM);
     }
 
     @Override
@@ -36,6 +41,8 @@ public class AdmProtocol extends BaseProtocol {
             @Override
             protected void addSpecificHandlers(ChannelPipeline pipeline) {
                 pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024, 2, 1, -3, 0));
+                pipeline.addLast("stringEncoder", new StringEncoder());
+                pipeline.addLast("objectEncoder", new AdmProtocolEncoder());
                 pipeline.addLast("objectDecoder", new AdmProtocolDecoder(AdmProtocol.this));
             }
         };
diff --git a/src/org/traccar/protocol/AdmProtocolDecoder.java b/src/org/traccar/protocol/AdmProtocolDecoder.java
index f4a21cad0..f93c55e18 100644
--- a/src/org/traccar/protocol/AdmProtocolDecoder.java
+++ b/src/org/traccar/protocol/AdmProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,76 +33,75 @@ public class AdmProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
+    public static final int CMD_RESPONSE_SIZE = 0x84;
     public static final int MSG_IMEI = 0x03;
     public static final int MSG_PHOTO = 0x0A;
     public static final int MSG_ADM5 = 0x01;
 
-    @Override
-    protected Object decode(
-            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
-
-        ChannelBuffer buf = (ChannelBuffer) msg;
-
-        buf.readUnsignedShort(); // device id
-        buf.readUnsignedByte(); // length
-
-        int type = buf.readUnsignedByte();
-
-        DeviceSession deviceSession;
-        if (type == MSG_IMEI) {
-            deviceSession = getDeviceSession(
-                    channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII));
-        } else {
-            deviceSession = getDeviceSession(channel, remoteAddress);
-        }
+    private Position decodeData(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf, int type) {
 
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
         if (deviceSession == null) {
             return null;
         }
 
         if (BitUtil.to(type, 2) == 0) {
-
             Position position = new Position();
             position.setProtocol(getProtocolName());
             position.setDeviceId(deviceSession.getDeviceId());
 
             position.set(Position.KEY_VERSION_FW, buf.readUnsignedByte());
-            buf.readUnsignedShort(); // index
+            position.set(Position.KEY_INDEX, buf.readUnsignedShort());
 
-            position.set(Position.KEY_STATUS, buf.readUnsignedShort());
-
-            position.setValid(true);
+            int status = buf.readUnsignedShort();
+            position.set(Position.KEY_STATUS, status);
+            position.setValid(!BitUtil.check(status, 5));
             position.setLatitude(buf.readFloat());
             position.setLongitude(buf.readFloat());
             position.setCourse(buf.readUnsignedShort() * 0.1);
             position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort() * 0.1));
 
-            position.set(Position.KEY_ACCELERATION, buf.readUnsignedByte());
-
+            position.set(Position.KEY_ACCELERATION, buf.readUnsignedByte() * 0.1);
             position.setAltitude(buf.readUnsignedShort());
-
             position.set(Position.KEY_HDOP, buf.readUnsignedByte() * 0.1);
             position.set(Position.KEY_SATELLITES, buf.readUnsignedByte() & 0x0f);
 
             position.setTime(new Date(buf.readUnsignedInt() * 1000));
 
-            position.set(Position.KEY_POWER, buf.readUnsignedShort());
-            position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
+            position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001);
+            position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
 
             if (BitUtil.check(type, 2)) {
-                buf.skipBytes(4);
+                buf.readUnsignedByte(); // vib
+                buf.readUnsignedByte(); // vib_count
+
+                int out = buf.readUnsignedByte();
+                for (int i = 0; i <= 3; i++) {
+                    position.set(Position.PREFIX_OUT + (i + 1), BitUtil.check(out, i) ? 1 : 0);
+                }
+
+                buf.readUnsignedByte(); // in_alarm
             }
 
             if (BitUtil.check(type, 3)) {
-                buf.skipBytes(12);
+                for (int i = 1; i <= 6; i++) {
+                    position.set(Position.PREFIX_ADC + i, buf.readUnsignedShort() * 0.001);
+                }
             }
 
             if (BitUtil.check(type, 4)) {
-                buf.skipBytes(8);
+                for (int i = 1; i <= 2; i++) {
+                    position.set(Position.PREFIX_COUNT + i, buf.readUnsignedInt());
+                }
             }
 
             if (BitUtil.check(type, 5)) {
-                buf.skipBytes(9);
+                for (int i = 1; i <= 3; i++) {
+                    buf.readUnsignedShort(); // fuel level
+                }
+                for (int i = 1; i <= 3; i++) {
+                    position.set(Position.PREFIX_TEMP + i, buf.readUnsignedByte());
+                }
             }
 
             if (BitUtil.check(type, 6)) {
@@ -119,4 +118,46 @@ public class AdmProtocolDecoder extends BaseProtocolDecoder {
         return null;
     }
 
+    private Position parseCommandResponse(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) {
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        getLastLocation(position, null);
+
+        int responseTextLength = buf.bytesBefore((byte) 0);
+        if (responseTextLength < 0) {
+            responseTextLength = CMD_RESPONSE_SIZE - 3;
+        }
+        position.set(Position.KEY_RESULT, buf.readBytes(responseTextLength).toString(StandardCharsets.UTF_8));
+
+        return position;
+    }
+
+    @Override
+    protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.readUnsignedShort(); // device id
+
+        int size = buf.readUnsignedByte();
+        if (size != CMD_RESPONSE_SIZE) {
+            int type = buf.readUnsignedByte();
+            if (type == MSG_IMEI) {
+                getDeviceSession(channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.UTF_8));
+            } else {
+                return decodeData(channel, remoteAddress, buf, type);
+            }
+        } else {
+            return parseCommandResponse(channel, remoteAddress, buf);
+        }
+
+        return null;
+    }
+
 }
diff --git a/src/org/traccar/protocol/AdmProtocolEncoder.java b/src/org/traccar/protocol/AdmProtocolEncoder.java
new file mode 100644
index 000000000..8cbd8618d
--- /dev/null
+++ b/src/org/traccar/protocol/AdmProtocolEncoder.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Anatoliy Golubev (darth.naihil@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.traccar.StringProtocolEncoder;
+import org.traccar.helper.Log;
+import org.traccar.model.Command;
+
+public class AdmProtocolEncoder extends StringProtocolEncoder {
+
+    @Override
+    protected Object encodeCommand(Command command) {
+
+        switch (command.getType()) {
+            case Command.TYPE_GET_DEVICE_STATUS:
+                return formatCommand(command, "STATUS\r\n");
+
+            case Command.TYPE_CUSTOM:
+                return formatCommand(command, "{%s}\r\n", Command.KEY_DATA);
+
+            default:
+                Log.warning(new UnsupportedOperationException(command.getType()));
+                break;
+        }
+
+        return null;
+    }
+}
diff --git a/src/org/traccar/protocol/AplicomProtocolDecoder.java b/src/org/traccar/protocol/AplicomProtocolDecoder.java
index eb8d77011..154451b5b 100644
--- a/src/org/traccar/protocol/AplicomProtocolDecoder.java
+++ b/src/org/traccar/protocol/AplicomProtocolDecoder.java
@@ -263,7 +263,8 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if ((selector & 0x0200) != 0) {
-            position.set(Position.KEY_RFID, (((long) buf.readUnsignedShort()) << 32) + buf.readUnsignedInt());
+            position.set(Position.KEY_DRIVER_UNIQUE_ID,
+                    String.valueOf(((long) buf.readUnsignedShort()) << 32) + buf.readUnsignedInt());
         }
 
         if ((selector & 0x0400) != 0) {
@@ -351,15 +352,28 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_VIN, buf.readBytes(18).toString(StandardCharsets.US_ASCII).trim());
         }
 
+        if ((selector & 0x2000) != 0) {
+            buf.readUnsignedByte(); // card 1 type
+            buf.readUnsignedByte(); // card 1 country code
+            String card = buf.readBytes(20).toString(StandardCharsets.US_ASCII).trim();
+            if (!card.isEmpty()) {
+                position.set("card1", card);
+            }
+        }
+
+        if ((selector & 0x4000) != 0) {
+            buf.readUnsignedByte(); // card 2 type
+            buf.readUnsignedByte(); // card 2 country code
+            String card = buf.readBytes(20).toString(StandardCharsets.US_ASCII).trim();
+            if (!card.isEmpty()) {
+                position.set("card2", card);
+            }
+        }
+
         if ((selector & 0x10000) != 0) {
             int count = buf.readUnsignedByte();
             for (int i = 1; i <= count; i++) {
-                ChannelBuffer driver = buf.readBytes(22);
-                int endIndex = driver.indexOf(0, driver.writerIndex(), (byte) 0);
-                if (endIndex < 0) {
-                    endIndex = driver.writerIndex();
-                }
-                position.set("driver" + i, driver.toString(0, endIndex, StandardCharsets.US_ASCII).trim());
+                position.set("driver" + i, buf.readBytes(22).toString(StandardCharsets.US_ASCII).trim());
                 position.set("driverTime" + i, buf.readUnsignedInt());
             }
         }
@@ -456,59 +470,59 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
         buf.readUnsignedShort(); // length
 
         while (buf.readableBytes() > 0) {
-            position.set("towedPosition", buf.readUnsignedByte());
+            buf.readUnsignedByte(); // towed position
             int type = buf.readUnsignedByte();
             int length = buf.readUnsignedByte();
+            int end = buf.readerIndex() + length;
 
-            if (type == 0x01) {
-                position.set("brakeFlags", ChannelBuffers.hexDump(buf.readBytes(length)));
-            } else if (type == 0x02) {
-                position.set("wheelSpeed", buf.readUnsignedShort() / 256.0);
-                position.set("wheelSpeedDifference", buf.readUnsignedShort() / 256.0 - 125.0);
-                position.set("lateralAcceleration", buf.readUnsignedByte() / 10.0 - 12.5);
-                position.set("vehicleSpeed", buf.readUnsignedShort() / 256.0);
-            } else if (type == 0x03) {
-                position.set("axleLoadSum", buf.readUnsignedShort() * 2);
-            } else if (type == 0x04) {
-                position.set("tyrePressure", buf.readUnsignedByte() * 10);
-                position.set("pneumaticPressure", buf.readUnsignedByte() * 5);
-            } else if (type == 0x05) {
-                position.set("brakeLining", buf.readUnsignedByte() * 0.4);
-                position.set("brakeTemperature", buf.readUnsignedByte() * 10);
-            } else if (type == 0x06) {
-                position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 5);
-                position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt() * 5);
-                position.set(Position.KEY_ODOMETER_SERVICE, (buf.readUnsignedInt() - 2105540607) * 5);
-            } else if (type == 0x0A) {
-                ChannelBuffer brakeData = buf.readBytes(length);
-                position.set("absStatusCounter", brakeData.readUnsignedShort());
-                position.set("atvbStatusCounter", brakeData.readUnsignedShort());
-                position.set("vdcActiveCounter", brakeData.readUnsignedShort());
-            } else if (type == 0x0B) {
-                position.set("brakeMinMaxData", ChannelBuffers.hexDump(buf.readBytes(length)));
-            } else if (type == 0x0C) {
-                position.set("missingPgn", ChannelBuffers.hexDump(buf.readBytes(length)));
-            } else if (type == 0x0D) {
-                switch (buf.readUnsignedByte()) {
-                    case 1:
-                        position.set("brakeManufacturer", "Wabco");
-                        break;
-                    case 2:
-                        position.set("brakeManufacturer", "Knorr");
-                        break;
-                    case 3:
-                        position.set("brakeManufacturer", "Haldex");
-                        break;
-                    default:
-                        position.set("brakeManufacturer", "Unknown");
-                        break;
-                }
-                buf.readUnsignedByte();
-                position.set(Position.KEY_VIN, buf.readBytes(17).toString(StandardCharsets.US_ASCII));
-                position.set("towedDetectionStatus", buf.readUnsignedByte());
-            } else if (type == 0x0E) {
-                buf.skipBytes(length);
+            switch (type) {
+                case 0x01:
+                    position.set("brakeFlags", ChannelBuffers.hexDump(buf.readBytes(length)));
+                    break;
+                case 0x02:
+                    position.set("wheelSpeed", buf.readUnsignedShort() / 256.0);
+                    position.set("wheelSpeedDifference", buf.readUnsignedShort() / 256.0 - 125.0);
+                    position.set("lateralAcceleration", buf.readUnsignedByte() / 10.0 - 12.5);
+                    position.set("vehicleSpeed", buf.readUnsignedShort() / 256.0);
+                    break;
+                case 0x03:
+                    position.set("axleLoadSum", buf.readUnsignedShort() * 2);
+                    break;
+                case 0x04:
+                    position.set("tyrePressure", buf.readUnsignedByte() * 10);
+                    position.set("pneumaticPressure", buf.readUnsignedByte() * 5);
+                    break;
+                case 0x05:
+                    position.set("brakeLining", buf.readUnsignedByte() * 0.4);
+                    position.set("brakeTemperature", buf.readUnsignedByte() * 10);
+                    break;
+                case 0x06:
+                    position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 5L);
+                    position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt() * 5L);
+                    position.set(Position.KEY_ODOMETER_SERVICE, (buf.readUnsignedInt() - 2105540607) * 5L);
+                    break;
+                case 0x0A:
+                    position.set("absStatusCounter", buf.readUnsignedShort());
+                    position.set("atvbStatusCounter", buf.readUnsignedShort());
+                    position.set("vdcActiveCounter", buf.readUnsignedShort());
+                    break;
+                case 0x0B:
+                    position.set("brakeMinMaxData", ChannelBuffers.hexDump(buf.readBytes(length)));
+                    break;
+                case 0x0C:
+                    position.set("missingPgn", ChannelBuffers.hexDump(buf.readBytes(length)));
+                    break;
+                case 0x0D:
+                    buf.readUnsignedByte();
+                    position.set("towedDetectionStatus", buf.readUnsignedInt());
+                    buf.skipBytes(17); // vin
+                    break;
+                case 0x0E:
+                default:
+                    break;
             }
+
+            buf.readerIndex(end);
         }
     }
 
@@ -554,7 +568,7 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_OBD_SPEED, buf.readUnsignedByte());
             position.set("speedMax", buf.readUnsignedByte());
             position.set("speedMin", buf.readUnsignedByte());
-            position.set("hardBreaking", buf.readUnsignedByte());
+            position.set("hardBraking", buf.readUnsignedByte());
         }
 
         if ((selector & 0x0200) != 0) {
diff --git a/src/org/traccar/protocol/AquilaProtocolDecoder.java b/src/org/traccar/protocol/AquilaProtocolDecoder.java
index 5ff974a7d..773210b04 100644
--- a/src/org/traccar/protocol/AquilaProtocolDecoder.java
+++ b/src/org/traccar/protocol/AquilaProtocolDecoder.java
@@ -81,7 +81,7 @@ public class AquilaProtocolDecoder extends BaseProtocolDecoder {
             .number("[01],")                     // corner packet
             .number("(?:d+,){6}")                // reserved
             .number("[01],")                     // hard acceleration
-            .number("[01],")                     // hard breaking
+            .number("[01],")                     // hard braking
             .number("[01],[01],[01],[01],")      // course bits
             .number("(d+),")                     // external voltage
             .number("(d+),")                     // internal voltage
@@ -115,7 +115,7 @@ public class AquilaProtocolDecoder extends BaseProtocolDecoder {
             .number("[01],")                     // do 1
             .number("[01],")                     // reserved
             .number("[01],")                     // hard acceleration
-            .number("[01],")                     // hard breaking
+            .number("[01],")                     // hard braking
             .number("(?:[01],){4}")              // reserved
             .number("(d+),")                     // external voltage
             .number("(d+),")                     // internal voltage
diff --git a/src/org/traccar/protocol/AstraProtocolDecoder.java b/src/org/traccar/protocol/AstraProtocolDecoder.java
index ea6aa7b30..8d86cd2be 100644
--- a/src/org/traccar/protocol/AstraProtocolDecoder.java
+++ b/src/org/traccar/protocol/AstraProtocolDecoder.java
@@ -105,7 +105,7 @@ public class AstraProtocolDecoder extends BaseProtocolDecoder {
             buf.readUnsignedByte(); // geofence events
 
             if (BitUtil.check(status, 8)) {
-                position.set(Position.KEY_RFID, buf.readBytes(7).toString(StandardCharsets.US_ASCII));
+                position.set(Position.KEY_DRIVER_UNIQUE_ID, buf.readBytes(7).toString(StandardCharsets.US_ASCII));
                 position.set(Position.KEY_ODOMETER, buf.readUnsignedMedium() * 1000);
                 position.set(Position.KEY_HOURS, buf.readUnsignedShort());
             }
diff --git a/src/org/traccar/protocol/AtrackProtocolDecoder.java b/src/org/traccar/protocol/AtrackProtocolDecoder.java
index 79b3c36cc..23cb67e15 100644
--- a/src/org/traccar/protocol/AtrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/AtrackProtocolDecoder.java
@@ -327,7 +327,7 @@ public class AtrackProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_OUTPUT, buf.readUnsignedByte());
             position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort() * 0.001);
 
-            position.set("driver", readString(buf));
+            position.set(Position.KEY_DRIVER_UNIQUE_ID, readString(buf));
 
             position.set(Position.PREFIX_TEMP + 1, buf.readShort() * 0.1);
             position.set(Position.PREFIX_TEMP + 2, buf.readShort() * 0.1);
diff --git a/src/org/traccar/protocol/CarscopProtocolDecoder.java b/src/org/traccar/protocol/CarscopProtocolDecoder.java
index ac3df1cd7..2a081bcdd 100644
--- a/src/org/traccar/protocol/CarscopProtocolDecoder.java
+++ b/src/org/traccar/protocol/CarscopProtocolDecoder.java
@@ -44,8 +44,10 @@ public class CarscopProtocolDecoder extends BaseProtocolDecoder {
             .number("(ddd.d)")                   // speed
             .number("(dd)(dd)(dd)")              // date (yymmdd)
             .number("(ddd.dd)")                  // course
+            .groupBegin()
             .number("(d{8})")                    // state
             .number("L(d{6})")                   // odometer
+            .groupEnd("?")
             .compile();
 
     @Override
@@ -88,8 +90,10 @@ public class CarscopProtocolDecoder extends BaseProtocolDecoder {
 
         position.setCourse(parser.nextDouble(0));
 
-        position.set(Position.KEY_STATUS, parser.next());
-        position.set(Position.KEY_ODOMETER, parser.nextInt(0));
+        if (parser.hasNext(2)) {
+            position.set(Position.KEY_STATUS, parser.next());
+            position.set(Position.KEY_ODOMETER, parser.nextInt(0));
+        }
 
         return position;
     }
diff --git a/src/org/traccar/protocol/CastelProtocolDecoder.java b/src/org/traccar/protocol/CastelProtocolDecoder.java
index 83664fa5a..3a0ccea78 100644
--- a/src/org/traccar/protocol/CastelProtocolDecoder.java
+++ b/src/org/traccar/protocol/CastelProtocolDecoder.java
@@ -440,7 +440,7 @@ public class CastelProtocolDecoder extends BaseProtocolDecoder {
 
             }
 
-        } else if (version == 4) {
+        } else if (version == 3 || version == 4) {
 
             return decodeSc(channel, remoteAddress, buf, version, id, type, deviceSession);
 
diff --git a/src/org/traccar/protocol/CityeasyProtocolEncoder.java b/src/org/traccar/protocol/CityeasyProtocolEncoder.java
index c800131d6..387926e03 100644
--- a/src/org/traccar/protocol/CityeasyProtocolEncoder.java
+++ b/src/org/traccar/protocol/CityeasyProtocolEncoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
  */
 package org.traccar.protocol;
 
+import java.util.TimeZone;
+
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.buffer.ChannelBuffers;
 import org.traccar.BaseProtocolEncoder;
@@ -56,13 +58,13 @@ public class CityeasyProtocolEncoder extends BaseProtocolEncoder {
                 content.writeShort(0);
                 return encodeContent(CityeasyProtocolDecoder.MSG_LOCATION_INTERVAL, content);
             case Command.TYPE_SET_TIMEZONE:
-                int timezone = command.getInteger(Command.KEY_TIMEZONE);
+                int timezone = TimeZone.getTimeZone(command.getString(Command.KEY_TIMEZONE)).getRawOffset() / 60000;
                 if (timezone < 0) {
                     content.writeByte(1);
                 } else {
                     content.writeByte(0);
                 }
-                content.writeShort(Math.abs(timezone) / 60);
+                content.writeShort(Math.abs(timezone));
                 return encodeContent(CityeasyProtocolDecoder.MSG_TIMEZONE, content);
             default:
                 Log.warning(new UnsupportedOperationException(command.getType()));
diff --git a/src/org/traccar/protocol/CradlepointProtocolDecoder.java b/src/org/traccar/protocol/CradlepointProtocolDecoder.java
index 1ba50f04b..e8f95a60c 100644
--- a/src/org/traccar/protocol/CradlepointProtocolDecoder.java
+++ b/src/org/traccar/protocol/CradlepointProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,11 +18,13 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.DeviceSession;
+import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
 import org.traccar.helper.PatternBuilder;
 import org.traccar.model.Position;
 
 import java.net.SocketAddress;
+import java.util.Date;
 import java.util.regex.Pattern;
 
 public class CradlepointProtocolDecoder extends BaseProtocolDecoder {
@@ -33,18 +35,18 @@ public class CradlepointProtocolDecoder extends BaseProtocolDecoder {
 
     private static final Pattern PATTERN = new PatternBuilder()
             .expression("([^,]+),")              // id
-            .number("(dd)(dd)(dd),")             // time (hhmmss)
+            .number("(d{1,6}),")                 // time (hhmmss)
             .number("(d+)(dd.d+),")              // latitude
             .expression("([NS]),")
             .number("(d+)(dd.d+),")              // longitude
             .expression("([EW]),")
             .number("(d+.d+)?,")                 // speed
             .number("(d+.d+)?,")                 // course
-            .expression("([^,]+),")              // carrier
+            .expression("([^,]+)?,")             // carrier
             .expression("([^,]+)?,")             // serdis
-            .number("(-?d+),")                   // rsrp
-            .number("(-?d+),")                   // dbm
-            .number("(-?d+),")                   // rsrq
+            .number("(-?d+)?,")                  // rsrp
+            .number("(-?d+)?,")                  // rssi
+            .number("(-?d+)?,")                  // rsrq
             .expression("([^,]+)?,")             // ecio
             .expression("([^,]+)?")              // wan ip
             .compile();
@@ -58,16 +60,21 @@ public class CradlepointProtocolDecoder extends BaseProtocolDecoder {
             return null;
         }
 
-        Position position = new Position();
-        position.setProtocol(getProtocolName());
-
         DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
         if (deviceSession == null) {
             return null;
         }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
         position.setDeviceId(deviceSession.getDeviceId());
 
-        position.setTime(parser.nextDateTime(Parser.DateTimeFormat.HMS));
+        int time = parser.nextInt();
+        DateBuilder dateBuilder = new DateBuilder(new Date());
+        dateBuilder.setHour(time / 100 / 100);
+        dateBuilder.setMinute(time / 100 % 100);
+        dateBuilder.setSecond(time % 100);
+        position.setTime(dateBuilder.getDate());
 
         position.setValid(true);
         position.setLatitude(parser.nextCoordinate());
@@ -75,9 +82,12 @@ public class CradlepointProtocolDecoder extends BaseProtocolDecoder {
         position.setSpeed(parser.nextDouble(0));
         position.setCourse(parser.nextDouble(0));
 
-        parser.skip(4);
-
-        position.set(Position.KEY_RSSI, parser.nextDouble());
+        position.set("carrid", parser.next());
+        position.set("serdis", parser.next());
+        position.set("rsrp", parser.next());
+        position.set("dbm", parser.next());
+        position.set("rsrq", parser.next());
+        position.set("ecio", parser.next());
 
         return position;
     }
diff --git a/src/org/traccar/protocol/EasyTrackProtocolDecoder.java b/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
index f44c91c4a..799254b65 100644
--- a/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2015 Anton Tananaev (anton@traccar.org)
+ * Copyright 2013 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,6 +22,7 @@ import org.traccar.helper.BitUtil;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
 import org.traccar.helper.PatternBuilder;
+import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Position;
 
 import java.net.SocketAddress;
@@ -92,7 +93,7 @@ public class EasyTrackProtocolDecoder extends BaseProtocolDecoder {
             position.setLongitude(parser.nextHexInt(0) / 600000.0);
         }
 
-        position.setSpeed(parser.nextHexInt(0) / 100.0);
+        position.setSpeed(UnitsConverter.knotsFromKph(parser.nextHexInt(0) / 100.0));
         position.setCourse(parser.nextHexInt(0) / 100.0);
 
         position.set(Position.KEY_STATUS, parser.next());
diff --git a/src/org/traccar/protocol/EelinkProtocolDecoder.java b/src/org/traccar/protocol/EelinkProtocolDecoder.java
index 0f6551cc3..8d0f8016a 100644
--- a/src/org/traccar/protocol/EelinkProtocolDecoder.java
+++ b/src/org/traccar/protocol/EelinkProtocolDecoder.java
@@ -96,6 +96,22 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
+    private void decodeStatus(Position position, int status) {
+        if (BitUtil.check(status, 1)) {
+            position.set(Position.KEY_IGNITION, BitUtil.check(status, 2));
+        }
+        if (BitUtil.check(status, 3)) {
+            position.set(Position.KEY_ARMED, BitUtil.check(status, 4));
+        }
+        if (BitUtil.check(status, 5)) {
+            position.set(Position.KEY_BLOCKED, !BitUtil.check(status, 6));
+        }
+        if (BitUtil.check(status, 7)) {
+            position.set(Position.KEY_CHARGE, BitUtil.check(status, 8));
+        }
+        position.set(Position.KEY_STATUS, status);
+    }
+
     private Position decodeOld(DeviceSession deviceSession, ChannelBuffer buf, int type, int index) {
 
         Position position = new Position();
@@ -115,27 +131,39 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
 
         position.setValid((buf.readUnsignedByte() & 0x01) != 0);
 
-        if (type == MSG_ALARM) {
-            position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
-        }
-
-        if (buf.readableBytes() >= 2 * 5) {
+        if (type == MSG_GPS) {
 
-            int status = buf.readUnsignedShort();
-            if (BitUtil.check(status, 1)) {
-                position.set(Position.KEY_IGNITION, BitUtil.check(status, 2));
+            if (buf.readableBytes() >= 2) {
+                decodeStatus(position, buf.readUnsignedShort());
             }
-            if (BitUtil.check(status, 7)) {
-                position.set(Position.KEY_CHARGE, BitUtil.check(status, 8));
+
+            if (buf.readableBytes() >= 2 * 4) {
+
+                position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
+
+                position.set(Position.KEY_RSSI, buf.readUnsignedShort());
+
+                position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort());
+                position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
+
             }
-            position.set(Position.KEY_STATUS, status);
 
-            position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
+        } else if (type == MSG_ALARM) {
 
-            position.set(Position.KEY_RSSI, buf.readUnsignedShort());
+            position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
 
-            position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort());
-            position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
+        } else if (type == MSG_STATE) {
+
+            int statusType = buf.readUnsignedByte();
+
+            position.set(Position.KEY_EVENT, statusType);
+
+            if (statusType == 0x01 || statusType == 0x02 || statusType == 0x03) {
+                buf.readUnsignedInt(); // device time
+                if (buf.readableBytes() >= 2) {
+                    decodeStatus(position, buf.readUnsignedShort());
+                }
+            }
 
         }
 
@@ -189,6 +217,45 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
             buf.skipBytes(7); // bss2
         }
 
+        if (buf.readableBytes() >= 2) {
+            int status = buf.readUnsignedShort();
+            position.setValid(BitUtil.check(status, 0));
+            if (BitUtil.check(status, 1)) {
+                position.set(Position.KEY_IGNITION, BitUtil.check(status, 2));
+            }
+            position.set(Position.KEY_STATUS, status);
+        }
+
+        if (buf.readableBytes() >= 2) {
+            position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
+        }
+
+        if (buf.readableBytes() >= 4) {
+            position.set(Position.PREFIX_ADC + 0, buf.readUnsignedShort());
+            position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort());
+        }
+
+        if (buf.readableBytes() >= 4) {
+            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
+        }
+
+        if (buf.readableBytes() >= 4) {
+            buf.readUnsignedShort(); // gsm counter
+            buf.readUnsignedShort(); // gps counter
+        }
+
+        if (buf.readableBytes() >= 4) {
+            position.set(Position.KEY_STEPS, buf.readUnsignedShort());
+            buf.readUnsignedShort(); // walking time
+        }
+
+        if (buf.readableBytes() >= 12) {
+            position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedShort() / 256.0);
+            position.set("humidity", buf.readUnsignedShort() * 0.1);
+            position.set("illuminance", buf.readUnsignedInt() / 256.0);
+            position.set("co2", buf.readUnsignedInt());
+        }
+
         return position;
     }
 
@@ -212,6 +279,7 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
             getDeviceSession(channel, remoteAddress, ChannelBuffers.hexDump(buf.readBytes(8)).substring(1));
 
         } else {
+
             DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
             if (deviceSession == null) {
                 return null;
@@ -221,7 +289,20 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
                 return decodeOld(deviceSession, buf, type, index);
             } else if (type >= MSG_NORMAL && type <= MSG_OBD_CODE) {
                 return decodeNew(deviceSession, buf, index);
+            } else if (type == MSG_HEARTBEAT && buf.readableBytes() >= 2) {
+
+                Position position = new Position();
+                position.setDeviceId(deviceSession.getDeviceId());
+                position.setProtocol(getProtocolName());
+
+                getLastLocation(position, null);
+
+                decodeStatus(position, buf.readUnsignedShort());
+
+                return position;
+
             }
+
         }
 
         return null;
diff --git a/src/org/traccar/protocol/EskyFrameDecoder.java b/src/org/traccar/protocol/EskyFrameDecoder.java
new file mode 100644
index 000000000..3175698fd
--- /dev/null
+++ b/src/org/traccar/protocol/EskyFrameDecoder.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class EskyFrameDecoder extends FrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+        buf.readerIndex(buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 'E'));
+
+        int endIndex = buf.indexOf(buf.readerIndex() + 1, buf.writerIndex(), (byte) 'E');
+        if (endIndex > 0) {
+            return buf.readBytes(endIndex - buf.readerIndex());
+        } else {
+            return buf.readBytes(buf.readableBytes()); // assume full frame
+        }
+    }
+
+}
diff --git a/src/org/traccar/protocol/EskyProtocol.java b/src/org/traccar/protocol/EskyProtocol.java
new file mode 100644
index 000000000..4c1d11f7d
--- /dev/null
+++ b/src/org/traccar/protocol/EskyProtocol.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.bootstrap.ServerBootstrap;
+import org.jboss.netty.channel.ChannelPipeline;
+import org.jboss.netty.handler.codec.string.StringDecoder;
+import org.jboss.netty.handler.codec.string.StringEncoder;
+import org.traccar.BaseProtocol;
+import org.traccar.TrackerServer;
+
+import java.util.List;
+
+public class EskyProtocol extends BaseProtocol {
+
+    public EskyProtocol() {
+        super("esky");
+    }
+
+    @Override
+    public void initTrackerServers(List<TrackerServer> serverList) {
+        serverList.add(new TrackerServer(new ServerBootstrap(), getName()) {
+            @Override
+            protected void addSpecificHandlers(ChannelPipeline pipeline) {
+                pipeline.addLast("frameDecoder", new EskyFrameDecoder());
+                pipeline.addLast("stringEncoder", new StringEncoder());
+                pipeline.addLast("stringDecoder", new StringDecoder());
+                pipeline.addLast("objectDecoder", new EskyProtocolDecoder(EskyProtocol.this));
+            }
+        });
+    }
+
+}
diff --git a/src/org/traccar/protocol/EskyProtocolDecoder.java b/src/org/traccar/protocol/EskyProtocolDecoder.java
new file mode 100644
index 000000000..d524224af
--- /dev/null
+++ b/src/org/traccar/protocol/EskyProtocolDecoder.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.helper.Parser;
+import org.traccar.helper.PatternBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.util.regex.Pattern;
+
+public class EskyProtocolDecoder extends BaseProtocolDecoder {
+
+    public EskyProtocolDecoder(EskyProtocol protocol) {
+        super(protocol);
+    }
+
+    private static final Pattern PATTERN = new PatternBuilder()
+            .text("EO;")                         // header
+            .number("d+;")                       // index
+            .number("(d+);")                     // imei
+            .text("R;")                          // data type
+            .number("(d+)").text("+")            // satellites
+            .number("(dd)(dd)(dd)")              // date
+            .number("(dd)(dd)(dd)").text("+")    // time
+            .number("(-?d+.d+)").text("+")       // latitude
+            .number("(-?d+.d+)").text("+")       // longitude
+            .number("(d+.d+)").text("+")         // speed
+            .number("(d+)").text("+")            // course
+            .text("0x").number("(d+)").text("+") // input
+            .number("(d+)").text("+")            // message type
+            .number("(d+)").text("+")            // odometer
+            .number("(d+)")                      // voltage
+            .any()
+            .compile();
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        Parser parser = new Parser(PATTERN, (String) msg);
+        if (!parser.matches()) {
+            return null;
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
+        if (deviceSession == null) {
+            return null;
+        }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        position.set(Position.KEY_SATELLITES, parser.nextInt());
+
+        position.setValid(true);
+        position.setTime(parser.nextDateTime());
+        position.setLatitude(parser.nextDouble());
+        position.setLongitude(parser.nextDouble());
+        position.setSpeed(UnitsConverter.knotsFromMps(parser.nextDouble()));
+        position.setCourse(parser.nextDouble());
+
+        position.set(Position.KEY_INPUT, parser.nextHexInt());
+        position.set(Position.KEY_EVENT, parser.nextInt());
+        position.set(Position.KEY_ODOMETER, parser.nextInt());
+        position.set(Position.KEY_POWER, parser.nextInt());
+
+        return position;
+    }
+
+}
diff --git a/src/org/traccar/protocol/FifotrackProtocolDecoder.java b/src/org/traccar/protocol/FifotrackProtocolDecoder.java
index f8f4fb078..304f6a2c3 100644
--- a/src/org/traccar/protocol/FifotrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/FifotrackProtocolDecoder.java
@@ -110,7 +110,7 @@ public class FifotrackProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.PREFIX_ADC + (i + 1), Integer.parseInt(adc[i], 16));
         }
 
-        position.set(Position.KEY_RFID, parser.next());
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
 
         if (parser.hasNext()) {
             String[] sensors = parser.next().split("\\|");
diff --git a/src/org/traccar/protocol/GenxProtocol.java b/src/org/traccar/protocol/GenxProtocol.java
new file mode 100644
index 000000000..2b5b1a43d
--- /dev/null
+++ b/src/org/traccar/protocol/GenxProtocol.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.bootstrap.ServerBootstrap;
+import org.jboss.netty.channel.ChannelPipeline;
+import org.jboss.netty.handler.codec.frame.LineBasedFrameDecoder;
+import org.jboss.netty.handler.codec.string.StringDecoder;
+import org.traccar.BaseProtocol;
+import org.traccar.TrackerServer;
+
+import java.util.List;
+
+public class GenxProtocol extends BaseProtocol {
+
+    public GenxProtocol() {
+        super("genx");
+    }
+
+    @Override
+    public void initTrackerServers(List<TrackerServer> serverList) {
+        serverList.add(new TrackerServer(new ServerBootstrap(), getName()) {
+            @Override
+            protected void addSpecificHandlers(ChannelPipeline pipeline) {
+                pipeline.addLast("frameDecoder", new LineBasedFrameDecoder(1024));
+                pipeline.addLast("stringDecoder", new StringDecoder());
+                pipeline.addLast("objectDecoder", new GenxProtocolDecoder(GenxProtocol.this));
+            }
+        });
+    }
+
+}
diff --git a/src/org/traccar/protocol/GenxProtocolDecoder.java b/src/org/traccar/protocol/GenxProtocolDecoder.java
new file mode 100644
index 000000000..3b716796c
--- /dev/null
+++ b/src/org/traccar/protocol/GenxProtocolDecoder.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.Context;
+import org.traccar.DeviceSession;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.text.SimpleDateFormat;
+
+public class GenxProtocolDecoder extends BaseProtocolDecoder {
+
+    private int[] reportColumns;
+
+    public GenxProtocolDecoder(GenxProtocol protocol) {
+        super(protocol);
+        setReportColumns(Context.getConfig().getString(getProtocolName() + ".reportColumns", "1,2,3,4"));
+    }
+
+    public void setReportColumns(String format) {
+        String[] columns = format.split(",");
+        reportColumns = new int[columns.length];
+        for (int i = 0; i < columns.length; i++) {
+            reportColumns[i] = Integer.parseInt(columns[i]);
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        String[] values = ((String) msg).split(",");
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+        position.setValid(true);
+
+        for (int i = 0; i < Math.min(values.length, reportColumns.length); i++) {
+            switch (reportColumns[i]) {
+                case 1:
+                    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, values[i]);
+                    if (deviceSession != null) {
+                        position.setDeviceId(deviceSession.getDeviceId());
+                    }
+                    break;
+                case 2:
+                    position.setTime(new SimpleDateFormat("MM/dd/yy HH:mm:ss").parse(values[i]));
+                    break;
+                case 3:
+                    position.setLatitude(Double.parseDouble(values[i]));
+                    break;
+                case 4:
+                    position.setLongitude(Double.parseDouble(values[i]));
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        return position.getDeviceId() != 0 ? position : null;
+    }
+
+}
diff --git a/src/org/traccar/protocol/Gl200BinaryProtocolDecoder.java b/src/org/traccar/protocol/Gl200BinaryProtocolDecoder.java
new file mode 100644
index 000000000..071960e49
--- /dev/null
+++ b/src/org/traccar/protocol/Gl200BinaryProtocolDecoder.java
@@ -0,0 +1,406 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.helper.BitBuffer;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.CellTower;
+import org.traccar.model.Network;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+public class Gl200BinaryProtocolDecoder extends BaseProtocolDecoder {
+
+    public Gl200BinaryProtocolDecoder(Gl200Protocol protocol) {
+        super(protocol);
+    }
+
+    private Date decodeTime(ChannelBuffer buf) {
+        DateBuilder dateBuilder = new DateBuilder()
+                .setDate(buf.readUnsignedShort(), buf.readUnsignedByte(), buf.readUnsignedByte())
+                .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+        return dateBuilder.getDate();
+    }
+
+    public static final int MSG_RSP_LCB = 3;
+    public static final int MSG_RSP_GEO = 8;
+    public static final int MSG_RSP_COMPRESSED = 100;
+
+    private List<Position> decodeLocation(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) {
+
+        List<Position> positions = new LinkedList<>();
+
+        int type = buf.readUnsignedByte();
+
+        buf.readUnsignedInt(); // mask
+        buf.readUnsignedShort(); // length
+        buf.readUnsignedByte(); // device type
+        buf.readUnsignedShort(); // protocol version
+        buf.readUnsignedShort(); // firmware version
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.format("%015d", buf.readLong()));
+        if (deviceSession == null) {
+            return null;
+        }
+
+        int battery = buf.readUnsignedByte();
+        int power = buf.readUnsignedShort();
+
+        if (type == MSG_RSP_GEO) {
+            buf.readUnsignedByte(); // reserved
+            buf.readUnsignedByte(); // reserved
+        }
+
+        buf.readUnsignedByte(); // motion status
+        int satellites = buf.readUnsignedByte();
+
+        if (type != MSG_RSP_COMPRESSED) {
+            buf.readUnsignedByte(); // index
+        }
+
+        if (type == MSG_RSP_LCB) {
+            buf.readUnsignedByte(); // phone length
+            for (int b = buf.readUnsignedByte();; b = buf.readUnsignedByte()) {
+                if ((b & 0xf) == 0xf || (b & 0xf0) == 0xf0) {
+                    break;
+                }
+            }
+        }
+
+        if (type == MSG_RSP_COMPRESSED) {
+
+            int count = buf.readUnsignedShort();
+
+            BitBuffer bits;
+            int speed = 0;
+            int heading = 0;
+            int latitude = 0;
+            int longitude = 0;
+            long time = 0;
+
+            for (int i = 0; i < count; i++) {
+
+                if (time > 0) {
+                    time += 1;
+                }
+
+                Position position = new Position();
+                position.setProtocol(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+
+                switch (BitUtil.from(buf.getUnsignedByte(buf.readerIndex()), 8 - 2)) {
+                    case 1:
+                        bits = new BitBuffer(buf.readBytes(3));
+                        bits.readUnsigned(2); // point attribute
+                        bits.readUnsigned(1); // fix type
+                        speed = bits.readUnsigned(12);
+                        heading = bits.readUnsigned(9);
+                        longitude = buf.readInt();
+                        latitude = buf.readInt();
+                        if (time == 0) {
+                            time = buf.readUnsignedInt();
+                        }
+                        break;
+                    case 2:
+                        bits = new BitBuffer(buf.readBytes(5));
+                        bits.readUnsigned(2); // point attribute
+                        bits.readUnsigned(1); // fix type
+                        speed += bits.readSigned(7);
+                        heading += bits.readSigned(7);
+                        longitude += bits.readSigned(12);
+                        latitude += bits.readSigned(11);
+                        break;
+                    default:
+                        buf.readUnsignedByte(); // invalid or same
+                        continue;
+                }
+
+                position.setValid(true);
+                position.setTime(new Date(time * 1000));
+                position.setSpeed(UnitsConverter.knotsFromKph(speed * 0.1));
+                position.setCourse(heading);
+                position.setLongitude(longitude * 0.000001);
+                position.setLatitude(latitude * 0.000001);
+
+                positions.add(position);
+
+            }
+
+        } else {
+
+            int count = buf.readUnsignedByte();
+
+            for (int i = 0; i < count; i++) {
+
+                Position position = new Position();
+                position.setProtocol(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+
+                position.set(Position.KEY_BATTERY_LEVEL, battery);
+                position.set(Position.KEY_POWER, power);
+                position.set(Position.KEY_SATELLITES, satellites);
+
+                int hdop = buf.readUnsignedByte();
+                position.setValid(hdop > 0);
+                position.set(Position.KEY_HDOP, hdop);
+
+                position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedMedium() * 0.1));
+                position.setCourse(buf.readUnsignedShort());
+                position.setAltitude(buf.readShort());
+                position.setLongitude(buf.readInt() * 0.000001);
+                position.setLatitude(buf.readInt() * 0.000001);
+
+                position.setTime(decodeTime(buf));
+
+                position.setNetwork(new Network(CellTower.from(
+                        buf.readUnsignedShort(), buf.readUnsignedShort(),
+                        buf.readUnsignedShort(), buf.readUnsignedShort())));
+
+                buf.readUnsignedByte(); // reserved
+
+                positions.add(position);
+
+            }
+
+        }
+
+        return positions;
+    }
+
+    public static final int MSG_EVT_BPL = 6;
+    public static final int MSG_EVT_VGN = 45;
+    public static final int MSG_EVT_VGF = 46;
+    public static final int MSG_EVT_UPD = 15;
+    public static final int MSG_EVT_IDF = 17;
+    public static final int MSG_EVT_GSS = 21;
+    public static final int MSG_EVT_GES = 26;
+    public static final int MSG_EVT_GPJ = 31;
+    public static final int MSG_EVT_RMD = 35;
+    public static final int MSG_EVT_JDS = 33;
+    public static final int MSG_EVT_CRA = 23;
+    public static final int MSG_EVT_UPC = 34;
+
+    private Position decodeEvent(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) {
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+
+        int type = buf.readUnsignedByte();
+
+        buf.readUnsignedInt(); // mask
+        buf.readUnsignedShort(); // length
+        buf.readUnsignedByte(); // device type
+        buf.readUnsignedShort(); // protocol version
+
+        position.set(Position.KEY_VERSION_FW, String.valueOf(buf.readUnsignedShort()));
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.format("%015d", buf.readLong()));
+        if (deviceSession == null) {
+            return null;
+        }
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte());
+        position.set(Position.KEY_POWER, buf.readUnsignedShort());
+
+        buf.readUnsignedByte(); // motion status
+
+        position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
+
+        switch (type) {
+            case MSG_EVT_BPL:
+                buf.readUnsignedShort(); // backup battery voltage
+                break;
+            case MSG_EVT_VGN:
+            case MSG_EVT_VGF:
+                buf.readUnsignedShort(); // reserved
+                buf.readUnsignedByte(); // report type
+                buf.readUnsignedInt(); // ignition duration
+                break;
+            case MSG_EVT_UPD:
+                buf.readUnsignedShort(); // code
+                buf.readUnsignedByte(); // retry
+                break;
+            case MSG_EVT_IDF:
+                buf.readUnsignedInt(); // idling duration
+                break;
+            case MSG_EVT_GSS:
+                buf.readUnsignedByte(); // gps signal status
+                buf.readUnsignedInt(); // reserved
+                break;
+            case MSG_EVT_GES:
+                buf.readUnsignedShort(); // trigger geo id
+                buf.readUnsignedByte(); // trigger geo enable
+                buf.readUnsignedByte(); // trigger mode
+                buf.readUnsignedInt(); // radius
+                buf.readUnsignedInt(); // check interval
+                break;
+            case MSG_EVT_GPJ:
+                buf.readUnsignedByte(); // cw jamming value
+                buf.readUnsignedByte(); // gps jamming state
+                break;
+            case MSG_EVT_RMD:
+                buf.readUnsignedByte(); // roaming state
+                break;
+            case MSG_EVT_JDS:
+                buf.readUnsignedByte(); // jamming state
+                break;
+            case MSG_EVT_CRA:
+                buf.readUnsignedByte(); // crash counter
+                break;
+            case MSG_EVT_UPC:
+                buf.readUnsignedByte(); // command id
+                buf.readUnsignedShort(); // result
+                break;
+            default:
+                break;
+        }
+
+        buf.readUnsignedByte(); // count
+
+        int hdop = buf.readUnsignedByte();
+        position.setValid(hdop > 0);
+        position.set(Position.KEY_HDOP, hdop);
+
+        position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedMedium() * 0.1));
+        position.setCourse(buf.readUnsignedShort());
+        position.setAltitude(buf.readShort());
+        position.setLongitude(buf.readInt() * 0.000001);
+        position.setLatitude(buf.readInt() * 0.000001);
+
+        position.setTime(decodeTime(buf));
+
+        position.setNetwork(new Network(CellTower.from(
+                buf.readUnsignedShort(), buf.readUnsignedShort(),
+                buf.readUnsignedShort(), buf.readUnsignedShort())));
+
+        buf.readUnsignedByte(); // reserved
+
+        return position;
+    }
+
+    public static final int MSG_INF_GPS = 2;
+    public static final int MSG_INF_CID = 4;
+    public static final int MSG_INF_CSQ = 5;
+    public static final int MSG_INF_VER = 6;
+    public static final int MSG_INF_BAT = 7;
+    public static final int MSG_INF_TMZ = 9;
+    public static final int MSG_INF_GIR = 10;
+
+    private Position decodeInformation(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) {
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+
+        int type = buf.readUnsignedByte();
+
+        buf.readUnsignedInt(); // mask
+        buf.readUnsignedShort(); // length
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.format("%015d", buf.readLong()));
+        if (deviceSession == null) {
+            return null;
+        }
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        buf.readUnsignedByte(); // device type
+        buf.readUnsignedShort(); // protocol version
+
+        position.set(Position.KEY_VERSION_FW, String.valueOf(buf.readUnsignedShort()));
+
+        if (type == MSG_INF_VER) {
+            buf.readUnsignedShort(); // hardware version
+            buf.readUnsignedShort(); // mcu version
+            buf.readUnsignedShort(); // reserved
+        }
+
+        buf.readUnsignedByte(); // motion status
+        buf.readUnsignedByte(); // reserved
+
+        position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
+
+        buf.readUnsignedByte(); // mode
+        buf.skipBytes(7); // last fix time
+        buf.readUnsignedByte(); // reserved
+        buf.readUnsignedByte();
+        buf.readUnsignedShort(); // response report mask
+        buf.readUnsignedShort(); // ign interval
+        buf.readUnsignedShort(); // igf interval
+        buf.readUnsignedInt(); // reserved
+        buf.readUnsignedByte(); // reserved
+
+        if (type == MSG_INF_BAT) {
+            position.set(Position.KEY_CHARGE, buf.readUnsignedByte() != 0);
+            position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001);
+            position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
+            position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte());
+        }
+
+        buf.skipBytes(10); // iccid
+
+        if (type == MSG_INF_CSQ) {
+            position.set(Position.KEY_RSSI, buf.readUnsignedByte());
+            buf.readUnsignedByte();
+        }
+
+        buf.readUnsignedByte(); // time zone flags
+        buf.readUnsignedShort(); // time zone offset
+
+        if (type == MSG_INF_GIR) {
+            buf.readUnsignedByte(); // gir trigger
+            buf.readUnsignedByte(); // cell number
+            position.setNetwork(new Network(CellTower.from(
+                    buf.readUnsignedShort(), buf.readUnsignedShort(),
+                    buf.readUnsignedShort(), buf.readUnsignedShort())));
+            buf.readUnsignedByte(); // ta
+            buf.readUnsignedByte(); // rx level
+        }
+
+        getLastLocation(position, decodeTime(buf));
+
+        return position;
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        switch (buf.readBytes(4).toString(StandardCharsets.US_ASCII)) {
+            case "+RSP":
+                return decodeLocation(channel, remoteAddress, buf);
+            case "+INF":
+                return decodeInformation(channel, remoteAddress, buf);
+            case "+EVT":
+                return decodeEvent(channel, remoteAddress, buf);
+            default:
+                return null;
+        }
+    }
+
+}
diff --git a/src/org/traccar/protocol/Gl200FrameDecoder.java b/src/org/traccar/protocol/Gl200FrameDecoder.java
new file mode 100644
index 000000000..960c3779a
--- /dev/null
+++ b/src/org/traccar/protocol/Gl200FrameDecoder.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Gl200FrameDecoder extends FrameDecoder {
+
+    private static final int MINIMUM_LENGTH = 11;
+
+    private static final Set<String> BINARY_HEADERS = new HashSet<>(
+            Arrays.asList("+RSP", "+BSP", "+EVT", "+BVT", "+INF", "+BNF", "+HBD", "+CRD", "+BRD"));
+
+    public static boolean isBinary(ChannelBuffer buf) {
+        String header = buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII);
+        if (header.equals("+ACK")) {
+            return buf.getByte(buf.readerIndex() + header.length()) != (byte) ':';
+        } else {
+            return BINARY_HEADERS.contains(header);
+        }
+    }
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+        if (buf.readableBytes() < MINIMUM_LENGTH) {
+            return null;
+        }
+
+        if (isBinary(buf)) {
+
+            int length;
+            switch (buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII)) {
+                case "+ACK":
+                    length = buf.getUnsignedByte(buf.readerIndex() + 6);
+                    break;
+                case "+INF":
+                case "+BNF":
+                    length = buf.getUnsignedShort(buf.readerIndex() + 7);
+                    break;
+                case "+HBD":
+                    length = buf.getUnsignedByte(buf.readerIndex() + 5);
+                    break;
+                case "+CRD":
+                case "+BRD":
+                    length = buf.getUnsignedShort(buf.readerIndex() + 6);
+                    break;
+                default:
+                    length = buf.getUnsignedShort(buf.readerIndex() + 9);
+                    break;
+            }
+
+            if (buf.readableBytes() >= length) {
+                return buf.readBytes(length);
+            }
+
+        } else {
+
+            int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '$');
+            if (endIndex < 0) {
+                endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
+            }
+            if (endIndex > 0) {
+                ChannelBuffer frame = buf.readBytes(endIndex - buf.readerIndex());
+                buf.readByte(); // delimiter
+                return frame;
+            }
+
+        }
+
+        return null;
+    }
+
+}
diff --git a/src/org/traccar/protocol/Gl200Protocol.java b/src/org/traccar/protocol/Gl200Protocol.java
index b3743042c..799d7fe36 100644
--- a/src/org/traccar/protocol/Gl200Protocol.java
+++ b/src/org/traccar/protocol/Gl200Protocol.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,10 +18,8 @@ package org.traccar.protocol;
 import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
 import org.jboss.netty.bootstrap.ServerBootstrap;
 import org.jboss.netty.channel.ChannelPipeline;
-import org.jboss.netty.handler.codec.string.StringDecoder;
 import org.jboss.netty.handler.codec.string.StringEncoder;
 import org.traccar.BaseProtocol;
-import org.traccar.CharacterDelimiterFrameDecoder;
 import org.traccar.TrackerServer;
 import org.traccar.model.Command;
 
@@ -44,9 +42,8 @@ public class Gl200Protocol extends BaseProtocol {
         serverList.add(new TrackerServer(new ServerBootstrap(), getName()) {
             @Override
             protected void addSpecificHandlers(ChannelPipeline pipeline) {
-                pipeline.addLast("frameDecoder", new CharacterDelimiterFrameDecoder(4096, "$", "\0"));
+                pipeline.addLast("frameDecoder", new Gl200FrameDecoder());
                 pipeline.addLast("stringEncoder", new StringEncoder());
-                pipeline.addLast("stringDecoder", new StringDecoder());
                 pipeline.addLast("objectEncoder", new Gl200ProtocolEncoder());
                 pipeline.addLast("objectDecoder", new Gl200ProtocolDecoder(Gl200Protocol.this));
             }
@@ -55,7 +52,6 @@ public class Gl200Protocol extends BaseProtocol {
             @Override
             protected void addSpecificHandlers(ChannelPipeline pipeline) {
                 pipeline.addLast("stringEncoder", new StringEncoder());
-                pipeline.addLast("stringDecoder", new StringDecoder());
                 pipeline.addLast("objectEncoder", new Gl200ProtocolEncoder());
                 pipeline.addLast("objectDecoder", new Gl200ProtocolDecoder(Gl200Protocol.this));
             }
diff --git a/src/org/traccar/protocol/Gl200ProtocolDecoder.java b/src/org/traccar/protocol/Gl200ProtocolDecoder.java
index a3062c942..0de7bb926 100644
--- a/src/org/traccar/protocol/Gl200ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gl200ProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,864 +15,34 @@
  */
 package org.traccar.protocol;
 
+import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
-import org.traccar.Context;
-import org.traccar.DeviceSession;
-import org.traccar.helper.BitUtil;
-import org.traccar.helper.Parser;
-import org.traccar.helper.PatternBuilder;
-import org.traccar.helper.UnitsConverter;
-import org.traccar.model.CellTower;
-import org.traccar.model.Network;
-import org.traccar.model.Position;
-import org.traccar.model.WifiAccessPoint;
 
 import java.net.SocketAddress;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
 
-    private boolean ignoreFixTime;
+    private final Gl200TextProtocolDecoder textProtocolDecoder;
+    private final Gl200BinaryProtocolDecoder binaryProtocolDecoder;
 
     public Gl200ProtocolDecoder(Gl200Protocol protocol) {
         super(protocol);
-
-        ignoreFixTime = Context.getConfig().getBoolean(getProtocolName() + ".ignoreFixTime");
-    }
-
-    private static final Pattern PATTERN_ACK = new PatternBuilder()
-            .text("+ACK:GT")
-            .expression("...,")                  // type
-            .number("([0-9A-Z]{2}xxxx),")        // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .any().text(",")
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd),")             // time (hhmmss)
-            .number("(xxxx)")                    // counter
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_INF = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF):GTINF,")
-            .number("[0-9A-Z]{2}xxxx,")          // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("(?:[0-9A-Z]{17},)?")    // vin
-            .expression("(?:[^,]+)?,")           // device name
-            .number("(xx),")                     // state
-            .expression("(?:[0-9F]{20})?,")      // iccid
-            .number("d{1,2},")
-            .number("d{1,2},")
-            .expression("[01],")                 // external power
-            .number("([d.]+)?,")                 // odometer or external power
-            .number("d*,")                       // backup battery or lightness
-            .number("(d+.d+),")                  // battery
-            .expression("([01]),")               // charging
-            .number("(?:d),")                    // led
-            .number("(?:d)?,")                   // gps on need
-            .number("(?:d)?,")                   // gps antenna type
-            .number("(?:d),").optional()         // gps antenna state
-            .number("d{14},")                    // last fix time
-            .groupBegin()
-            .number("(d+),")                     // battery percentage
-            .expression("[01]?,")                // flash type
-            .number("(-?[d.]+)?,,,")             // temperature
-            .or()
-            .expression("(?:[01])?,").optional() // pin15 mode
-            .number("(d+)?,")                    // adc1
-            .number("(d+)?,").optional()         // adc2
-            .number("(xx)?,")                    // digital input
-            .number("(xx)?,")                    // digital output
-            .number("[-+]dddd,")                 // timezone
-            .expression("[01],")                 // daylight saving
-            .groupEnd()
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd),")             // time (hhmmss)
-            .number("(xxxx)")                    // counter
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_VER = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF):GTVER,")
-            .number("[0-9A-Z]{2}xxxx,")          // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("[^,]*,")                // device name
-            .expression("([^,]*),")              // device type
-            .number("(xxxx),")                   // firmware version
-            .number("(xxxx),")                   // hardware version
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd),")             // time (hhmmss)
-            .number("(xxxx)")                    // counter
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_LOCATION = new PatternBuilder()
-            .number("(d{1,2})?,")                // hdop
-            .number("(d{1,3}.d)?,")              // speed
-            .number("(d{1,3})?,")                // course
-            .number("(-?d{1,5}.d)?,")            // altitude
-            .number("(-?d{1,3}.d{6})?,")         // longitude
-            .number("(-?d{1,2}.d{6})?,")         // latitude
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(d+)?,")                    // mcc
-            .number("(d+)?,")                    // mnc
-            .groupBegin()
-            .number("(d+),")                     // lac
-            .number("(d+),")                     // cid
-            .or()
-            .number("(x+)?,")                    // lac
-            .number("(x+)?,")                    // cid
-            .groupEnd()
-            .number("(?:d+|(d+.d))?,")           // odometer
-            .compile();
-
-    private static final Pattern PATTERN_OBD = new PatternBuilder()
-            .text("+RESP:GTOBD,")
-            .number("[0-9A-Z]{2}xxxx,")          // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("(?:[0-9A-Z]{17})?,")    // vin
-            .expression("[^,]{0,20},")           // device name
-            .expression("[01],")                 // report type
-            .number("x{1,8},")                   // report mask
-            .expression("(?:[0-9A-Z]{17})?,")    // vin
-            .number("[01],")                     // obd connect
-            .number("(?:d{1,5})?,")              // obd voltage
-            .number("(?:x{8})?,")                // support pids
-            .number("(d{1,5})?,")                // engine rpm
-            .number("(d{1,3})?,")                // speed
-            .number("(-?d{1,3})?,")              // coolant temp
-            .number("(d+.?d*|Inf|NaN)?,")        // fuel consumption
-            .number("(d{1,5})?,")                // dtcs cleared distance
-            .number("(?:d{1,5})?,")
-            .expression("([01])?,")              // obd connect
-            .number("(d{1,3})?,")                // number of dtcs
-            .number("(x*),")                     // dtcs
-            .number("(d{1,3})?,")                // throttle
-            .number("(?:d{1,3})?,")              // engine load
-            .number("(d{1,3})?,")                // fuel level
-            .expression("(?:[0-9A],)?")          // obd protocol
-            .number("(d+),")                     // odometer
-            .expression(PATTERN_LOCATION.pattern())
-            .number("(d{1,7}.d)?,")              // odometer
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_FRI = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF):GTFRI,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("(?:([0-9A-Z]{17}),)?")  // vin
-            .expression("[^,]*,")                // device name
-            .number("(d+)?,")                    // power
-            .number("d{1,2},")                   // report type
-            .number("d{1,2},")                   // count
-            .expression("((?:")
-            .expression(PATTERN_LOCATION.pattern())
-            .expression(")+)")
-            .groupBegin()
-            .number("(d{1,7}.d)?,").optional()   // odometer
-            .number("(d{1,3})?,")                // battery
-            .or()
-            .number("(d{1,7}.d)?,")              // odometer
-            .number("(d{5}:dd:dd)?,")            // hour meter
-            .number("(x+)?,")                    // adc 1
-            .number("(x+)?,")                    // adc 2
-            .number("(d{1,3})?,")                // battery
-            .number("(?:(xx)(xx)(xx))?,")        // device status
-            .number("(d+)?,")                    // rpm
-            .number("(?:d+.?d*|Inf|NaN)?,")      // fuel consumption
-            .number("(d+)?,")                    // fuel level
-            .groupEnd()
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_ERI = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF):GTERI,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("[^,]*,")                // device name
-            .number("x{8},")                     // mask
-            .number("(d+)?,")                    // power
-            .number("d{1,2},")                   // report type
-            .number("d{1,2},")                   // count
-            .expression("((?:")
-            .expression(PATTERN_LOCATION.pattern())
-            .expression(")+)")
-            .number("(d{1,7}.d)?,")              // odometer
-            .number("(d{5}:dd:dd)?,")            // hour meter
-            .number("(x+)?,")                    // adc 1
-            .number("(x+)?,")                    // adc 2
-            .number("(d{1,3})?,")                // battery
-            .number("(?:(xx)(xx)(xx))?,")        // device status
-            .expression("(.*)")                  // additional data
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_IGN = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF):GTIG[NF],")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("[^,]*,")                // device name
-            .number("d+,")                       // ignition off duration
-            .expression(PATTERN_LOCATION.pattern())
-            .number("(d{5}:dd:dd)?,")            // hour meter
-            .number("(d{1,7}.d)?,")              // odometer
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_IDA = new PatternBuilder()
-            .text("+RESP:GTIDA,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("[^,]*,,")               // device name
-            .number("([^,]+),")                  // rfid
-            .expression("[01],")                 // report type
-            .number("1,")                        // count
-            .expression(PATTERN_LOCATION.pattern())
-            .number("(d+.d),")                   // odometer
-            .text(",,,,")
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_WIF = new PatternBuilder()
-            .text("+RESP:GTWIF,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("[^,]*,")                // device name
-            .number("(d+),")                     // count
-            .number("((?:x{12},-?d+,,,,)+),,,,") // wifi
-            .number("(d{1,3}),")                 // battery
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_GSM = new PatternBuilder()
-            .text("+RESP:GTGSM,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("(?:STR|CTN|NMR|RTL),")  // fix type
-            .expression("(.*)")                  // cells
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF):GT...,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .expression("[^,]*,")                // device name
-            .number("d*,")
-            .number("(d{1,2}),")                 // report type
-            .number("d{1,2},")                   // count
-            .expression(PATTERN_LOCATION.pattern())
-            .groupBegin()
-            .number("(d{1,7}.d)?,").optional()   // odometer
-            .number("(d{1,3})?,")                // battery
-            .or()
-            .number("(d{1,7}.d)?,")              // odometer
-            .groupEnd()
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)")  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private static final Pattern PATTERN_BASIC = new PatternBuilder()
-            .text("+").expression("(?:RESP|BUFF)").text(":")
-            .expression("GT...,")
-            .number("(?:[0-9A-Z]{2}xxxx)?,").optional() // protocol version
-            .number("(d{15}|x{14}),")            // imei
-            .any()
-            .number("(d{1,2})?,")                // hdop
-            .number("(d{1,3}.d)?,")              // speed
-            .number("(d{1,3})?,")                // course
-            .number("(-?d{1,5}.d)?,")            // altitude
-            .number("(-?d{1,3}.d{6})?,")         // longitude
-            .number("(-?d{1,2}.d{6})?,")         // latitude
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(d+),")                     // mcc
-            .number("(d+),")                     // mnc
-            .number("(x+),")                     // lac
-            .number("(x+),").optional(4)         // cell
-            .any()
-            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
-            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
-            .text(",")
-            .number("(xxxx)")                    // count number
-            .text("$").optional()
-            .compile();
-
-    private Object decodeAck(Channel channel, SocketAddress remoteAddress, String sentence, String type) {
-        Parser parser = new Parser(PATTERN_ACK, sentence);
-        if (parser.matches()) {
-            String protocolVersion = parser.next();
-            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
-            if (deviceSession == null) {
-                return null;
-            }
-            if (type.equals("HBD")) {
-                if (channel != null) {
-                    parser.skip(6);
-                    channel.write("+SACK:GTHBD," + protocolVersion + "," + parser.next() + "$", remoteAddress);
-                }
-            } else {
-                Position position = new Position();
-                position.setProtocol(getProtocolName());
-                position.setDeviceId(deviceSession.getDeviceId());
-                getLastLocation(position, parser.nextDateTime());
-                position.setValid(false);
-                position.set(Position.KEY_RESULT, "Command " + type + " accepted");
-                return position;
-            }
-        }
-        return null;
-    }
-
-    private Position initPosition(Parser parser, Channel channel, SocketAddress remoteAddress) {
-        if (parser.matches()) {
-            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
-            if (deviceSession != null) {
-                Position position = new Position();
-                position.setProtocol(getProtocolName());
-                position.setDeviceId(deviceSession.getDeviceId());
-                return position;
-            }
-        }
-        return null;
-    }
-
-    private void decodeDeviceTime(Position position, Parser parser) {
-        if (parser.hasNext(6)) {
-            if (ignoreFixTime) {
-                position.setTime(parser.nextDateTime());
-            } else {
-                position.setDeviceTime(parser.nextDateTime());
-            }
-        }
-    }
-
-    private Object decodeInf(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_INF, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        position.set(Position.KEY_STATUS, parser.next());
-
-        parser.next(); // odometer or external power
-
-        position.set(Position.KEY_BATTERY, parser.nextDouble(0));
-        position.set(Position.KEY_CHARGE, parser.nextInt(0) == 1);
-
-        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
-
-        position.set(Position.PREFIX_TEMP + 1, parser.next());
-
-        position.set(Position.PREFIX_ADC + 1, parser.next());
-        position.set(Position.PREFIX_ADC + 2, parser.next());
-
-        position.set(Position.KEY_INPUT, parser.next());
-        position.set(Position.KEY_OUTPUT, parser.next());
-
-        getLastLocation(position, parser.nextDateTime());
-
-        position.set(Position.KEY_INDEX, parser.nextHexInt(0));
-
-        return position;
-    }
-
-    private Object decodeVer(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_VER, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        position.set("deviceType", parser.next());
-        position.set(Position.KEY_VERSION_FW, parser.nextHexInt(0));
-        position.set(Position.KEY_VERSION_HW, parser.nextHexInt(0));
-
-        getLastLocation(position, parser.nextDateTime());
-
-        return position;
-    }
-
-    private void decodeLocation(Position position, Parser parser) {
-        int hdop = parser.nextInt(0);
-        position.setValid(hdop > 0);
-        position.set(Position.KEY_HDOP, hdop);
-
-        position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
-        position.setCourse(parser.nextDouble(0));
-        position.setAltitude(parser.nextDouble(0));
-
-        if (parser.hasNext(8)) {
-            position.setValid(true);
-            position.setLongitude(parser.nextDouble(0));
-            position.setLatitude(parser.nextDouble(0));
-            position.setTime(parser.nextDateTime());
-        } else {
-            getLastLocation(position, null);
-        }
-
-        if (parser.hasNext(6)) {
-            int mcc = parser.nextInt(0);
-            int mnc = parser.nextInt(0);
-            if (parser.hasNext(2)) {
-                position.setNetwork(new Network(CellTower.from(mcc, mnc, parser.nextInt(0), parser.nextInt(0))));
-            }
-            if (parser.hasNext(2)) {
-                position.setNetwork(new Network(CellTower.from(mcc, mnc, parser.nextHexInt(0), parser.nextHexInt(0))));
-            }
-        }
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-    }
-
-    private Object decodeObd(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_OBD, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        position.set(Position.KEY_RPM, parser.nextInt());
-        position.set(Position.KEY_OBD_SPEED, parser.nextInt());
-        position.set(Position.PREFIX_TEMP + 1, parser.nextInt());
-        position.set(Position.KEY_FUEL_CONSUMPTION, parser.next());
-        position.set("dtcsClearedDistance", parser.nextInt());
-        position.set("odbConnect", parser.nextInt(0) == 1);
-        position.set("dtcsNumber", parser.nextInt());
-        position.set("dtcsCodes", parser.next());
-        position.set(Position.KEY_THROTTLE, parser.nextInt());
-        position.set(Position.KEY_FUEL_LEVEL, parser.nextInt());
-        position.set(Position.KEY_OBD_ODOMETER, parser.nextInt(0) * 1000);
-
-        decodeLocation(position, parser);
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-
-        decodeDeviceTime(position, parser);
-
-        return position;
-    }
-
-    private void decodeStatus(Position position, Parser parser) {
-        if (parser.hasNext(3)) {
-            int ignition = parser.nextHexInt(0);
-            if (BitUtil.check(ignition, 4)) {
-                position.set(Position.KEY_IGNITION, false);
-            } else if (BitUtil.check(ignition, 5)) {
-                position.set(Position.KEY_IGNITION, true);
-            }
-            position.set(Position.KEY_INPUT, parser.nextHexInt(0));
-            position.set(Position.KEY_OUTPUT, parser.nextHexInt(0));
-        }
-    }
-
-    private Object decodeFri(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_FRI, sentence);
-        if (!parser.matches()) {
-            return null;
-        }
-
-        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
-        if (deviceSession == null) {
-            return null;
-        }
-
-        LinkedList<Position> positions = new LinkedList<>();
-
-        String vin = parser.next();
-        int power = parser.nextInt(0);
-
-        Parser itemParser = new Parser(PATTERN_LOCATION, parser.next());
-        while (itemParser.find()) {
-            Position position = new Position();
-            position.setProtocol(getProtocolName());
-            position.setDeviceId(deviceSession.getDeviceId());
-
-            position.set(Position.KEY_VIN, vin);
-
-            decodeLocation(position, itemParser);
-
-            positions.add(position);
-        }
-
-        Position position = positions.getLast();
-
-        decodeLocation(position, parser);
-
-        // power value only on some devices
-        if (power > 10) {
-            position.set(Position.KEY_POWER, power);
-        }
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-        position.set(Position.KEY_HOURS, parser.next());
-        position.set(Position.PREFIX_ADC + 1, parser.next());
-        position.set(Position.PREFIX_ADC + 2, parser.next());
-        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
-
-        decodeStatus(position, parser);
-
-        position.set(Position.KEY_RPM, parser.nextInt());
-        position.set(Position.KEY_FUEL_LEVEL, parser.nextInt());
-
-        decodeDeviceTime(position, parser);
-
-        return positions;
-    }
-
-    private Object decodeEri(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_ERI, sentence);
-        if (!parser.matches()) {
-            return null;
-        }
-
-        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
-        if (deviceSession == null) {
-            return null;
-        }
-
-        LinkedList<Position> positions = new LinkedList<>();
-
-        int power = parser.nextInt(0);
-
-        Parser itemParser = new Parser(PATTERN_LOCATION, parser.next());
-        while (itemParser.find()) {
-            Position position = new Position();
-            position.setProtocol(getProtocolName());
-            position.setDeviceId(deviceSession.getDeviceId());
-
-            decodeLocation(position, itemParser);
-
-            positions.add(position);
-        }
-
-        Position position = positions.getLast();
-
-        decodeLocation(position, parser);
-
-        position.set(Position.KEY_POWER, power);
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-        position.set(Position.KEY_HOURS, parser.next());
-        position.set(Position.PREFIX_ADC + 1, parser.next());
-        position.set(Position.PREFIX_ADC + 2, parser.next());
-        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
-
-        decodeStatus(position, parser);
-
-        int index = 0;
-        String[] data = parser.next().split(",");
-        if (data.length > 1) {
-            int deviceType = Integer.parseInt(data[index++]);
-            if (deviceType == 2) {
-                int deviceCount = Integer.parseInt(data[index++]);
-                for (int i = 1; i <= deviceCount; i++) {
-                    index++; // id
-                    index++; // type
-                    position.set(Position.PREFIX_TEMP + i, Short.parseShort(data[index++], 16) * 0.0625);
-                }
-            }
-        }
-
-        decodeDeviceTime(position, parser);
-
-        return positions;
-    }
-
-    private Object decodeIgn(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_IGN, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        decodeLocation(position, parser);
-
-        position.set(Position.KEY_HOURS, parser.next());
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-
-        decodeDeviceTime(position, parser);
-
-        return position;
-    }
-
-    private Object decodeIda(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_IDA, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        position.set(Position.KEY_RFID, parser.next());
-
-        decodeLocation(position, parser);
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-
-        decodeDeviceTime(position, parser);
-
-        return position;
-    }
-
-    private Object decodeWif(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_WIF, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        getLastLocation(position, null);
-
-        Network network = new Network();
-
-        parser.nextInt(0); // count
-        Matcher matcher = Pattern.compile("([0-9a-fA-F]{12}),(-?\\d+),,,,").matcher(parser.next());
-        while (matcher.find()) {
-            String mac = matcher.group(1).replaceAll("(..)", "$1:");
-            network.addWifiAccessPoint(WifiAccessPoint.from(
-                    mac.substring(0, mac.length() - 1), Integer.parseInt(matcher.group(2))));
-        }
-
-        position.setNetwork(network);
-
-        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt(0));
-
-        return position;
-    }
-
-    private Object decodeGsm(Channel channel, SocketAddress remoteAddress, String sentence) {
-        Parser parser = new Parser(PATTERN_GSM, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        getLastLocation(position, null);
-
-        Network network = new Network();
-
-        String[] data = parser.next().split(",");
-        for (int i = 0; i < 6; i++) {
-            if (!data[i * 6].isEmpty()) {
-                network.addCellTower(CellTower.from(
-                        Integer.parseInt(data[i * 6]), Integer.parseInt(data[i * 6 + 1]),
-                        Integer.parseInt(data[i * 6 + 2], 16), Integer.parseInt(data[i * 6 + 3], 16),
-                        Integer.parseInt(data[i * 6 + 4])));
-            }
-        }
-
-        position.setNetwork(network);
-
-        return position;
-    }
-
-    private Object decodeOther(Channel channel, SocketAddress remoteAddress, String sentence, String type) {
-        Parser parser = new Parser(PATTERN, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        int reportType = parser.nextInt(0);
-        if (type.equals("NMR")) {
-            position.set(Position.KEY_MOTION, reportType == 1);
-        } else if (type.equals("SOS")) {
-            position.set(Position.KEY_ALARM, Position.ALARM_SOS);
-        }
-
-        decodeLocation(position, parser);
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt(0));
-
-        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
-
-        decodeDeviceTime(position, parser);
-
-        if (Context.getConfig().getBoolean(getProtocolName() + ".ack") && channel != null) {
-            channel.write("+SACK:" + parser.next() + "$", remoteAddress);
-        }
-
-        return position;
-    }
-
-    private Object decodeBasic(Channel channel, SocketAddress remoteAddress, String sentence, String type) {
-        Parser parser = new Parser(PATTERN_BASIC, sentence);
-        Position position = initPosition(parser, channel, remoteAddress);
-        if (position == null) {
-            return null;
-        }
-
-        int hdop = parser.nextInt(0);
-        position.setValid(hdop > 0);
-        position.set(Position.KEY_HDOP, hdop);
-
-        position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
-        position.setCourse(parser.nextDouble(0));
-        position.setAltitude(parser.nextDouble(0));
-
-        if (parser.hasNext(2)) {
-            position.setLongitude(parser.nextDouble(0));
-            position.setLatitude(parser.nextDouble(0));
-        } else {
-            getLastLocation(position, null);
-        }
-
-        if (parser.hasNext(6)) {
-            position.setTime(parser.nextDateTime());
-        }
-
-        if (parser.hasNext(4)) {
-            position.setNetwork(new Network(CellTower.from(
-                    parser.nextInt(0), parser.nextInt(0), parser.nextHexInt(0), parser.nextHexInt(0))));
-        }
-
-        decodeDeviceTime(position, parser);
-
-        switch (type) {
-            case "PNA":
-                position.set(Position.KEY_ALARM, Position.ALARM_POWER_ON);
-                break;
-            case "PFA":
-                position.set(Position.KEY_ALARM, Position.ALARM_POWER_OFF);
-                break;
-            case "EPN":
-                position.set(Position.KEY_ALARM, Position.ALARM_POWER_RESTORED);
-                break;
-            case "EPF":
-                position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT);
-                break;
-            case "BPL":
-                position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY);
-                break;
-            case "STT":
-                position.set(Position.KEY_ALARM, Position.ALARM_MOVEMENT);
-                break;
-            case "SWG":
-                position.set(Position.KEY_ALARM, Position.ALARM_GEOFENCE);
-                break;
-            case "TMP":
-            case "TEM":
-                position.set(Position.KEY_ALARM, Position.ALARM_TEMPERATURE);
-                break;
-            case "JDR":
-            case "JDS":
-                position.set(Position.KEY_ALARM, Position.ALARM_JAMMING);
-                break;
-            default:
-                break;
-        }
-
-        return position;
+        textProtocolDecoder = new Gl200TextProtocolDecoder(protocol);
+        binaryProtocolDecoder = new Gl200BinaryProtocolDecoder(protocol);
     }
 
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
 
-        String sentence = (String) msg;
+        ChannelBuffer buf = (ChannelBuffer) msg;
 
-        int typeIndex = sentence.indexOf(":GT");
-        if (typeIndex < 0) {
-            return null;
-        }
-
-        Object result;
-        String type = sentence.substring(typeIndex + 3, typeIndex + 6);
-        if (sentence.startsWith("+ACK")) {
-            result = decodeAck(channel, remoteAddress, sentence, type);
+        if (Gl200FrameDecoder.isBinary(buf)) {
+            return binaryProtocolDecoder.decode(channel, remoteAddress, msg);
         } else {
-            switch (type) {
-                case "INF":
-                    result = decodeInf(channel, remoteAddress, sentence);
-                    break;
-                case "OBD":
-                    result = decodeObd(channel, remoteAddress, sentence);
-                    break;
-                case "FRI":
-                    result = decodeFri(channel, remoteAddress, sentence);
-                    break;
-                case "ERI":
-                    result = decodeEri(channel, remoteAddress, sentence);
-                    break;
-                case "IGN":
-                case "IGF":
-                    result = decodeIgn(channel, remoteAddress, sentence);
-                    break;
-                case "IDA":
-                    result = decodeIda(channel, remoteAddress, sentence);
-                    break;
-                case "WIF":
-                    result = decodeWif(channel, remoteAddress, sentence);
-                    break;
-                case "GSM":
-                    result = decodeGsm(channel, remoteAddress, sentence);
-                    break;
-                case "VER":
-                    result = decodeVer(channel, remoteAddress, sentence);
-                    break;
-                default:
-                    result = decodeOther(channel, remoteAddress, sentence, type);
-                    break;
-            }
-
-            if (result == null) {
-                result = decodeBasic(channel, remoteAddress, sentence, type);
-            }
-
-            if (result != null) {
-                if (result instanceof Position) {
-                    ((Position) result).set(Position.KEY_TYPE, type);
-                } else {
-                    for (Position p : (List<Position>) result) {
-                        p.set(Position.KEY_TYPE, type);
-                    }
-                }
-            }
+            return textProtocolDecoder.decode(channel, remoteAddress, msg);
         }
-
-        return result;
     }
 
 }
diff --git a/src/org/traccar/protocol/Gl200TextProtocolDecoder.java b/src/org/traccar/protocol/Gl200TextProtocolDecoder.java
new file mode 100644
index 000000000..2f03cbb8f
--- /dev/null
+++ b/src/org/traccar/protocol/Gl200TextProtocolDecoder.java
@@ -0,0 +1,917 @@
+/*
+ * Copyright 2012 - 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.Context;
+import org.traccar.DeviceSession;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.Parser;
+import org.traccar.helper.PatternBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.CellTower;
+import org.traccar.model.Network;
+import org.traccar.model.Position;
+import org.traccar.model.WifiAccessPoint;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Gl200TextProtocolDecoder extends BaseProtocolDecoder {
+
+    private boolean ignoreFixTime;
+
+    public Gl200TextProtocolDecoder(Gl200Protocol protocol) {
+        super(protocol);
+
+        ignoreFixTime = Context.getConfig().getBoolean(getProtocolName() + ".ignoreFixTime");
+    }
+
+    private static final Pattern PATTERN_ACK = new PatternBuilder()
+            .text("+ACK:GT")
+            .expression("...,")                  // type
+            .number("([0-9A-Z]{2}xxxx),")        // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .any().text(",")
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd),")             // time (hhmmss)
+            .number("(xxxx)")                    // counter
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_INF = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF):GTINF,")
+            .number("[0-9A-Z]{2}xxxx,")          // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("(?:[0-9A-Z]{17},)?")    // vin
+            .expression("(?:[^,]+)?,")           // device name
+            .number("(xx),")                     // state
+            .expression("(?:[0-9Ff]{20})?,")     // iccid
+            .number("(d{1,2}),")                 // rssi
+            .number("d{1,2},")
+            .expression("[01],")                 // external power
+            .number("([d.]+)?,")                 // odometer or external power
+            .number("d*,")                       // backup battery or lightness
+            .number("(d+.d+),")                  // battery
+            .expression("([01]),")               // charging
+            .number("(?:d),")                    // led
+            .number("(?:d)?,")                   // gps on need
+            .number("(?:d)?,")                   // gps antenna type
+            .number("(?:d)?,").optional()        // gps antenna state
+            .number("d{14},")                    // last fix time
+            .groupBegin()
+            .number("(d+),")                     // battery percentage
+            .number("[d.]*,")                    // flash type / power
+            .number("(-?[d.]+)?,,,")             // temperature
+            .or()
+            .expression("(?:[01])?,").optional() // pin15 mode
+            .number("(d+)?,")                    // adc1
+            .number("(d+)?,").optional()         // adc2
+            .number("(xx)?,")                    // digital input
+            .number("(xx)?,")                    // digital output
+            .number("[-+]dddd,")                 // timezone
+            .expression("[01],")                 // daylight saving
+            .groupEnd()
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd),")             // time (hhmmss)
+            .number("(xxxx)")                    // counter
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_VER = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF):GTVER,")
+            .number("[0-9A-Z]{2}xxxx,")          // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("[^,]*,")                // device name
+            .expression("([^,]*),")              // device type
+            .number("(xxxx),")                   // firmware version
+            .number("(xxxx),")                   // hardware version
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd),")             // time (hhmmss)
+            .number("(xxxx)")                    // counter
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_LOCATION = new PatternBuilder()
+            .number("(d{1,2})?,")                // hdop
+            .number("(d{1,3}.d)?,")              // speed
+            .number("(d{1,3})?,")                // course
+            .number("(-?d{1,5}.d)?,")            // altitude
+            .number("(-?d{1,3}.d{6})?,")         // longitude
+            .number("(-?d{1,2}.d{6})?,")         // latitude
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(d+)?,")                    // mcc
+            .number("(d+)?,")                    // mnc
+            .groupBegin()
+            .number("(d+),")                     // lac
+            .number("(d+),")                     // cid
+            .or()
+            .number("(x+)?,")                    // lac
+            .number("(x+)?,")                    // cid
+            .groupEnd()
+            .number("(?:d+|(d+.d))?,")           // odometer
+            .compile();
+
+    private static final Pattern PATTERN_OBD = new PatternBuilder()
+            .text("+RESP:GTOBD,")
+            .number("[0-9A-Z]{2}xxxx,")          // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("(?:[0-9A-Z]{17})?,")    // vin
+            .expression("[^,]{0,20},")           // device name
+            .expression("[01],")                 // report type
+            .number("x{1,8},")                   // report mask
+            .expression("(?:[0-9A-Z]{17})?,")    // vin
+            .number("[01],")                     // obd connect
+            .number("(?:d{1,5})?,")              // obd voltage
+            .number("(?:x{8})?,")                // support pids
+            .number("(d{1,5})?,")                // engine rpm
+            .number("(d{1,3})?,")                // speed
+            .number("(-?d{1,3})?,")              // coolant temp
+            .number("(d+.?d*|Inf|NaN)?,")        // fuel consumption
+            .number("(d{1,5})?,")                // dtcs cleared distance
+            .number("(?:d{1,5})?,")
+            .expression("([01])?,")              // obd connect
+            .number("(d{1,3})?,")                // number of dtcs
+            .number("(x*),")                     // dtcs
+            .number("(d{1,3})?,")                // throttle
+            .number("(?:d{1,3})?,")              // engine load
+            .number("(d{1,3})?,")                // fuel level
+            .expression("(?:[0-9A],)?")          // obd protocol
+            .number("(d+),")                     // odometer
+            .expression(PATTERN_LOCATION.pattern())
+            .number("(d{1,7}.d)?,")              // odometer
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_FRI = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF):GTFRI,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("(?:([0-9A-Z]{17}),)?")  // vin
+            .expression("[^,]*,")                // device name
+            .number("(d+)?,")                    // power
+            .number("d{1,2},")                   // report type
+            .number("d{1,2},")                   // count
+            .expression("((?:")
+            .expression(PATTERN_LOCATION.pattern())
+            .expression(")+)")
+            .groupBegin()
+            .number("(d{1,7}.d)?,").optional()   // odometer
+            .number("(d{1,3})?,")                // battery
+            .or()
+            .number("(d{1,7}.d)?,")              // odometer
+            .number("(d{5}:dd:dd)?,")            // hour meter
+            .number("(x+)?,")                    // adc 1
+            .number("(x+)?,")                    // adc 2
+            .number("(d{1,3})?,")                // battery
+            .number("(?:(xx)(xx)(xx))?,")        // device status
+            .number("(d+)?,")                    // rpm
+            .number("(?:d+.?d*|Inf|NaN)?,")      // fuel consumption
+            .number("(d+)?,")                    // fuel level
+            .groupEnd()
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_ERI = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF):GTERI,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("[^,]*,")                // device name
+            .number("x{8},")                     // mask
+            .number("(d+)?,")                    // power
+            .number("d{1,2},")                   // report type
+            .number("d{1,2},")                   // count
+            .expression("((?:")
+            .expression(PATTERN_LOCATION.pattern())
+            .expression(")+)")
+            .number("(d{1,7}.d)?,")              // odometer
+            .number("(d{5}:dd:dd)?,")            // hour meter
+            .number("(x+)?,")                    // adc 1
+            .number("(x+)?,")                    // adc 2
+            .number("(d{1,3})?,")                // battery
+            .number("(?:(xx)(xx)(xx))?,")        // device status
+            .expression("(.*)")                  // additional data
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_IGN = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF):GTIG[NF],")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("[^,]*,")                // device name
+            .number("d+,")                       // ignition off duration
+            .expression(PATTERN_LOCATION.pattern())
+            .number("(d{5}:dd:dd)?,")            // hour meter
+            .number("(d{1,7}.d)?,")              // odometer
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_IDA = new PatternBuilder()
+            .text("+RESP:GTIDA,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("[^,]*,,")               // device name
+            .number("([^,]+),")                  // rfid
+            .expression("[01],")                 // report type
+            .number("1,")                        // count
+            .expression(PATTERN_LOCATION.pattern())
+            .number("(d+.d),")                   // odometer
+            .text(",,,,")
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_WIF = new PatternBuilder()
+            .text("+RESP:GTWIF,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("[^,]*,")                // device name
+            .number("(d+),")                     // count
+            .number("((?:x{12},-?d+,,,,)+),,,,") // wifi
+            .number("(d{1,3}),")                 // battery
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_GSM = new PatternBuilder()
+            .text("+RESP:GTGSM,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("(?:STR|CTN|NMR|RTL),")  // fix type
+            .expression("(.*)")                  // cells
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF):GT...,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,")     // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .expression("[^,]*,")                // device name
+            .number("d*,")
+            .number("(d{1,2}),")                 // report type
+            .number("d{1,2},")                   // count
+            .expression(PATTERN_LOCATION.pattern())
+            .groupBegin()
+            .number("(d{1,7}.d)?,").optional()   // odometer
+            .number("(d{1,3})?,")                // battery
+            .or()
+            .number("(d{1,7}.d)?,")              // odometer
+            .groupEnd()
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)")  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private static final Pattern PATTERN_BASIC = new PatternBuilder()
+            .text("+").expression("(?:RESP|BUFF)").text(":")
+            .expression("GT...,")
+            .number("(?:[0-9A-Z]{2}xxxx)?,").optional() // protocol version
+            .number("(d{15}|x{14}),")            // imei
+            .any()
+            .number("(d{1,2})?,")                // hdop
+            .number("(d{1,3}.d)?,")              // speed
+            .number("(d{1,3})?,")                // course
+            .number("(-?d{1,5}.d)?,")            // altitude
+            .number("(-?d{1,3}.d{6})?,")         // longitude
+            .number("(-?d{1,2}.d{6})?,")         // latitude
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(d+),")                     // mcc
+            .number("(d+),")                     // mnc
+            .number("(x+),")                     // lac
+            .number("(x+),").optional(4)         // cell
+            .any()
+            .number("(dddd)(dd)(dd)")            // date (yyyymmdd)
+            .number("(dd)(dd)(dd)").optional(2)  // time (hhmmss)
+            .text(",")
+            .number("(xxxx)")                    // count number
+            .text("$").optional()
+            .compile();
+
+    private Object decodeAck(Channel channel, SocketAddress remoteAddress, String sentence, String type) {
+        Parser parser = new Parser(PATTERN_ACK, sentence);
+        if (parser.matches()) {
+            String protocolVersion = parser.next();
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
+            if (deviceSession == null) {
+                return null;
+            }
+            if (type.equals("HBD")) {
+                if (channel != null) {
+                    parser.skip(6);
+                    channel.write("+SACK:GTHBD," + protocolVersion + "," + parser.next() + "$", remoteAddress);
+                }
+            } else {
+                Position position = new Position();
+                position.setProtocol(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+                getLastLocation(position, parser.nextDateTime());
+                position.setValid(false);
+                position.set(Position.KEY_RESULT, "Command " + type + " accepted");
+                return position;
+            }
+        }
+        return null;
+    }
+
+    private Position initPosition(Parser parser, Channel channel, SocketAddress remoteAddress) {
+        if (parser.matches()) {
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
+            if (deviceSession != null) {
+                Position position = new Position();
+                position.setProtocol(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+                return position;
+            }
+        }
+        return null;
+    }
+
+    private void decodeDeviceTime(Position position, Parser parser) {
+        if (parser.hasNext(6)) {
+            if (ignoreFixTime) {
+                position.setTime(parser.nextDateTime());
+            } else {
+                position.setDeviceTime(parser.nextDateTime());
+            }
+        }
+    }
+
+    private Object decodeInf(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_INF, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        switch (parser.nextHexInt()) {
+            case 0x16:
+            case 0x1A:
+            case 0x12:
+                position.set(Position.KEY_IGNITION, false);
+                position.set(Position.KEY_MOTION, true);
+                break;
+            case 0x11:
+                position.set(Position.KEY_IGNITION, false);
+                position.set(Position.KEY_MOTION, false);
+                break;
+            case 0x21:
+                position.set(Position.KEY_IGNITION, true);
+                position.set(Position.KEY_MOTION, false);
+                break;
+            case 0x22:
+                position.set(Position.KEY_IGNITION, true);
+                position.set(Position.KEY_MOTION, true);
+                break;
+            case 0x41:
+                position.set(Position.KEY_MOTION, false);
+                break;
+            case 0x42:
+                position.set(Position.KEY_MOTION, true);
+                break;
+            default:
+                break;
+        }
+
+        position.set(Position.KEY_RSSI, parser.nextInt());
+
+        parser.next(); // odometer or external power
+
+        position.set(Position.KEY_BATTERY, parser.nextDouble(0));
+        position.set(Position.KEY_CHARGE, parser.nextInt(0) == 1);
+
+        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
+
+        position.set(Position.PREFIX_TEMP + 1, parser.next());
+
+        position.set(Position.PREFIX_ADC + 1, parser.next());
+        position.set(Position.PREFIX_ADC + 2, parser.next());
+
+        position.set(Position.KEY_INPUT, parser.next());
+        position.set(Position.KEY_OUTPUT, parser.next());
+
+        getLastLocation(position, parser.nextDateTime());
+
+        position.set(Position.KEY_INDEX, parser.nextHexInt(0));
+
+        return position;
+    }
+
+    private Object decodeVer(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_VER, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        position.set("deviceType", parser.next());
+        position.set(Position.KEY_VERSION_FW, parser.nextHexInt(0));
+        position.set(Position.KEY_VERSION_HW, parser.nextHexInt(0));
+
+        getLastLocation(position, parser.nextDateTime());
+
+        return position;
+    }
+
+    private void decodeLocation(Position position, Parser parser) {
+        int hdop = parser.nextInt(0);
+        position.setValid(hdop > 0);
+        position.set(Position.KEY_HDOP, hdop);
+
+        position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
+        position.setCourse(parser.nextDouble(0));
+        position.setAltitude(parser.nextDouble(0));
+
+        if (parser.hasNext(8)) {
+            position.setValid(true);
+            position.setLongitude(parser.nextDouble(0));
+            position.setLatitude(parser.nextDouble(0));
+            position.setTime(parser.nextDateTime());
+        } else {
+            getLastLocation(position, null);
+        }
+
+        if (parser.hasNext(6)) {
+            int mcc = parser.nextInt(0);
+            int mnc = parser.nextInt(0);
+            if (parser.hasNext(2)) {
+                position.setNetwork(new Network(CellTower.from(mcc, mnc, parser.nextInt(0), parser.nextInt(0))));
+            }
+            if (parser.hasNext(2)) {
+                position.setNetwork(new Network(CellTower.from(mcc, mnc, parser.nextHexInt(0), parser.nextHexInt(0))));
+            }
+        }
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+    }
+
+    private Object decodeObd(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_OBD, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        position.set(Position.KEY_RPM, parser.nextInt());
+        position.set(Position.KEY_OBD_SPEED, parser.nextInt());
+        position.set(Position.PREFIX_TEMP + 1, parser.nextInt());
+        position.set(Position.KEY_FUEL_CONSUMPTION, parser.next());
+        position.set("dtcsClearedDistance", parser.nextInt());
+        position.set("odbConnect", parser.nextInt(0) == 1);
+        position.set("dtcsNumber", parser.nextInt());
+        position.set("dtcsCodes", parser.next());
+        position.set(Position.KEY_THROTTLE, parser.nextInt());
+        position.set(Position.KEY_FUEL_LEVEL, parser.nextInt());
+        position.set(Position.KEY_OBD_ODOMETER, parser.nextInt(0) * 1000);
+
+        decodeLocation(position, parser);
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+
+        decodeDeviceTime(position, parser);
+
+        return position;
+    }
+
+    private void decodeStatus(Position position, Parser parser) {
+        if (parser.hasNext(3)) {
+            int ignition = parser.nextHexInt(0);
+            if (BitUtil.check(ignition, 4)) {
+                position.set(Position.KEY_IGNITION, false);
+            } else if (BitUtil.check(ignition, 5)) {
+                position.set(Position.KEY_IGNITION, true);
+            }
+            position.set(Position.KEY_INPUT, parser.nextHexInt(0));
+            position.set(Position.KEY_OUTPUT, parser.nextHexInt(0));
+        }
+    }
+
+    private Object decodeFri(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_FRI, sentence);
+        if (!parser.matches()) {
+            return null;
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
+        if (deviceSession == null) {
+            return null;
+        }
+
+        LinkedList<Position> positions = new LinkedList<>();
+
+        String vin = parser.next();
+        int power = parser.nextInt(0);
+
+        Parser itemParser = new Parser(PATTERN_LOCATION, parser.next());
+        while (itemParser.find()) {
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.set(Position.KEY_VIN, vin);
+
+            decodeLocation(position, itemParser);
+
+            positions.add(position);
+        }
+
+        Position position = positions.getLast();
+
+        decodeLocation(position, parser);
+
+        // power value only on some devices
+        if (power > 10) {
+            position.set(Position.KEY_POWER, power);
+        }
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+        position.set(Position.KEY_HOURS, parser.next());
+        position.set(Position.PREFIX_ADC + 1, parser.next());
+        position.set(Position.PREFIX_ADC + 2, parser.next());
+        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
+
+        decodeStatus(position, parser);
+
+        position.set(Position.KEY_RPM, parser.nextInt());
+        position.set(Position.KEY_FUEL_LEVEL, parser.nextInt());
+
+        decodeDeviceTime(position, parser);
+        if (ignoreFixTime) {
+            positions.clear();
+            positions.add(position);
+        }
+
+        return positions;
+    }
+
+    private Object decodeEri(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_ERI, sentence);
+        if (!parser.matches()) {
+            return null;
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
+        if (deviceSession == null) {
+            return null;
+        }
+
+        LinkedList<Position> positions = new LinkedList<>();
+
+        int power = parser.nextInt(0);
+
+        Parser itemParser = new Parser(PATTERN_LOCATION, parser.next());
+        while (itemParser.find()) {
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            decodeLocation(position, itemParser);
+
+            positions.add(position);
+        }
+
+        Position position = positions.getLast();
+
+        decodeLocation(position, parser);
+
+        position.set(Position.KEY_POWER, power);
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+        position.set(Position.KEY_HOURS, parser.next());
+        position.set(Position.PREFIX_ADC + 1, parser.next());
+        position.set(Position.PREFIX_ADC + 2, parser.next());
+        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
+
+        decodeStatus(position, parser);
+
+        int index = 0;
+        String[] data = parser.next().split(",");
+        if (data.length > 1) {
+            int deviceType = Integer.parseInt(data[index++]);
+            if (deviceType == 2) {
+                int deviceCount = Integer.parseInt(data[index++]);
+                for (int i = 1; i <= deviceCount; i++) {
+                    index++; // id
+                    index++; // type
+                    position.set(Position.PREFIX_TEMP + i, (short) Integer.parseInt(data[index++], 16) * 0.0625);
+                }
+            }
+        }
+
+        decodeDeviceTime(position, parser);
+        if (ignoreFixTime) {
+            positions.clear();
+            positions.add(position);
+        }
+
+        return positions;
+    }
+
+    private Object decodeIgn(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_IGN, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        decodeLocation(position, parser);
+
+        position.set(Position.KEY_HOURS, parser.next());
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+
+        decodeDeviceTime(position, parser);
+
+        return position;
+    }
+
+    private Object decodeIda(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_IDA, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
+
+        decodeLocation(position, parser);
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+
+        decodeDeviceTime(position, parser);
+
+        return position;
+    }
+
+    private Object decodeWif(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_WIF, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        getLastLocation(position, null);
+
+        Network network = new Network();
+
+        parser.nextInt(0); // count
+        Matcher matcher = Pattern.compile("([0-9a-fA-F]{12}),(-?\\d+),,,,").matcher(parser.next());
+        while (matcher.find()) {
+            String mac = matcher.group(1).replaceAll("(..)", "$1:");
+            network.addWifiAccessPoint(WifiAccessPoint.from(
+                    mac.substring(0, mac.length() - 1), Integer.parseInt(matcher.group(2))));
+        }
+
+        position.setNetwork(network);
+
+        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt(0));
+
+        return position;
+    }
+
+    private Object decodeGsm(Channel channel, SocketAddress remoteAddress, String sentence) {
+        Parser parser = new Parser(PATTERN_GSM, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        getLastLocation(position, null);
+
+        Network network = new Network();
+
+        String[] data = parser.next().split(",");
+        for (int i = 0; i < 6; i++) {
+            if (!data[i * 6].isEmpty()) {
+                network.addCellTower(CellTower.from(
+                        Integer.parseInt(data[i * 6]), Integer.parseInt(data[i * 6 + 1]),
+                        Integer.parseInt(data[i * 6 + 2], 16), Integer.parseInt(data[i * 6 + 3], 16),
+                        Integer.parseInt(data[i * 6 + 4])));
+            }
+        }
+
+        position.setNetwork(network);
+
+        return position;
+    }
+
+    private Object decodeOther(Channel channel, SocketAddress remoteAddress, String sentence, String type) {
+        Parser parser = new Parser(PATTERN, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        int reportType = parser.nextInt(0);
+        if (type.equals("NMR")) {
+            position.set(Position.KEY_MOTION, reportType == 1);
+        } else if (type.equals("SOS")) {
+            position.set(Position.KEY_ALARM, Position.ALARM_SOS);
+        }
+
+        decodeLocation(position, parser);
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+        position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt(0));
+
+        position.set(Position.KEY_ODOMETER, parser.nextDouble(0) * 1000);
+
+        decodeDeviceTime(position, parser);
+
+        if (Context.getConfig().getBoolean(getProtocolName() + ".ack") && channel != null) {
+            channel.write("+SACK:" + parser.next() + "$", remoteAddress);
+        }
+
+        return position;
+    }
+
+    private Object decodeBasic(Channel channel, SocketAddress remoteAddress, String sentence, String type) {
+        Parser parser = new Parser(PATTERN_BASIC, sentence);
+        Position position = initPosition(parser, channel, remoteAddress);
+        if (position == null) {
+            return null;
+        }
+
+        int hdop = parser.nextInt(0);
+        position.setValid(hdop > 0);
+        position.set(Position.KEY_HDOP, hdop);
+
+        position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
+        position.setCourse(parser.nextDouble(0));
+        position.setAltitude(parser.nextDouble(0));
+
+        if (parser.hasNext(2)) {
+            position.setLongitude(parser.nextDouble(0));
+            position.setLatitude(parser.nextDouble(0));
+        } else {
+            getLastLocation(position, null);
+        }
+
+        if (parser.hasNext(6)) {
+            position.setTime(parser.nextDateTime());
+        }
+
+        if (parser.hasNext(4)) {
+            position.setNetwork(new Network(CellTower.from(
+                    parser.nextInt(0), parser.nextInt(0), parser.nextHexInt(0), parser.nextHexInt(0))));
+        }
+
+        decodeDeviceTime(position, parser);
+
+        switch (type) {
+            case "PNA":
+                position.set(Position.KEY_ALARM, Position.ALARM_POWER_ON);
+                break;
+            case "PFA":
+                position.set(Position.KEY_ALARM, Position.ALARM_POWER_OFF);
+                break;
+            case "EPN":
+                position.set(Position.KEY_ALARM, Position.ALARM_POWER_RESTORED);
+                break;
+            case "EPF":
+                position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT);
+                break;
+            case "BPL":
+                position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY);
+                break;
+            case "STT":
+                position.set(Position.KEY_ALARM, Position.ALARM_MOVEMENT);
+                break;
+            case "SWG":
+                position.set(Position.KEY_ALARM, Position.ALARM_GEOFENCE);
+                break;
+            case "TMP":
+            case "TEM":
+                position.set(Position.KEY_ALARM, Position.ALARM_TEMPERATURE);
+                break;
+            case "JDR":
+            case "JDS":
+                position.set(Position.KEY_ALARM, Position.ALARM_JAMMING);
+                break;
+            default:
+                break;
+        }
+
+        return position;
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        String sentence = ((ChannelBuffer) msg).toString(StandardCharsets.US_ASCII);
+
+        int typeIndex = sentence.indexOf(":GT");
+        if (typeIndex < 0) {
+            return null;
+        }
+
+        Object result;
+        String type = sentence.substring(typeIndex + 3, typeIndex + 6);
+        if (sentence.startsWith("+ACK")) {
+            result = decodeAck(channel, remoteAddress, sentence, type);
+        } else {
+            switch (type) {
+                case "INF":
+                    result = decodeInf(channel, remoteAddress, sentence);
+                    break;
+                case "OBD":
+                    result = decodeObd(channel, remoteAddress, sentence);
+                    break;
+                case "FRI":
+                    result = decodeFri(channel, remoteAddress, sentence);
+                    break;
+                case "ERI":
+                    result = decodeEri(channel, remoteAddress, sentence);
+                    break;
+                case "IGN":
+                case "IGF":
+                    result = decodeIgn(channel, remoteAddress, sentence);
+                    break;
+                case "IDA":
+                    result = decodeIda(channel, remoteAddress, sentence);
+                    break;
+                case "WIF":
+                    result = decodeWif(channel, remoteAddress, sentence);
+                    break;
+                case "GSM":
+                    result = decodeGsm(channel, remoteAddress, sentence);
+                    break;
+                case "VER":
+                    result = decodeVer(channel, remoteAddress, sentence);
+                    break;
+                default:
+                    result = decodeOther(channel, remoteAddress, sentence, type);
+                    break;
+            }
+
+            if (result == null) {
+                result = decodeBasic(channel, remoteAddress, sentence, type);
+            }
+
+            if (result != null) {
+                if (result instanceof Position) {
+                    ((Position) result).set(Position.KEY_TYPE, type);
+                } else {
+                    for (Position p : (List<Position>) result) {
+                        p.set(Position.KEY_TYPE, type);
+                    }
+                }
+            }
+        }
+
+        return result;
+    }
+
+}
diff --git a/src/org/traccar/protocol/GnxProtocolDecoder.java b/src/org/traccar/protocol/GnxProtocolDecoder.java
index 070d394e8..2274ec164 100644
--- a/src/org/traccar/protocol/GnxProtocolDecoder.java
+++ b/src/org/traccar/protocol/GnxProtocolDecoder.java
@@ -102,7 +102,7 @@ public class GnxProtocolDecoder extends BaseProtocolDecoder {
         position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
 
         if (type.equals("MIF")) {
-            position.set(Position.KEY_RFID, parser.next());
+            position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
         }
 
         return position;
diff --git a/src/org/traccar/protocol/Gps103ProtocolDecoder.java b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
index f5ba3cff7..099047aa0 100644
--- a/src/org/traccar/protocol/Gps103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -248,6 +248,8 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.PREFIX_TEMP + 1, alarm.substring(2));
         } else if (alarm.startsWith("oil ")) {
             position.set("oil", alarm.substring(4));
+        } else if (!position.getAttributes().containsKey(Position.KEY_ALARM) && !alarm.equals("tracker")) {
+            position.set(Position.KEY_EVENT, alarm);
         }
 
         DateBuilder dateBuilder = new DateBuilder()
@@ -258,7 +260,7 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
 
         String rfid = parser.next();
         if (alarm.equals("rfid")) {
-            position.set(Position.KEY_RFID, rfid);
+            position.set(Position.KEY_DRIVER_UNIQUE_ID, rfid);
         }
 
         String utcHours = parser.next();
diff --git a/src/org/traccar/protocol/Gt06FrameDecoder.java b/src/org/traccar/protocol/Gt06FrameDecoder.java
index f35af6572..c8b5e56ae 100644
--- a/src/org/traccar/protocol/Gt06FrameDecoder.java
+++ b/src/org/traccar/protocol/Gt06FrameDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2014 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,7 +26,6 @@ public class Gt06FrameDecoder extends FrameDecoder {
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
 
-        // Check minimum length
         if (buf.readableBytes() < 5) {
             return null;
         }
@@ -35,21 +34,22 @@ public class Gt06FrameDecoder extends FrameDecoder {
 
         if (buf.getByte(buf.readerIndex()) == 0x78) {
             length += 1 + buf.getUnsignedByte(buf.readerIndex() + 2);
-
-            int type = buf.getUnsignedByte(buf.readerIndex() + 3);
-            if (type == Gt06ProtocolDecoder.MSG_STATUS && length == 13) {
-                length += 2; // workaround for #1727
-            }
-
         } else {
             length += 2 + buf.getUnsignedShort(buf.readerIndex() + 2);
         }
 
-        // Check length and return buffer
-        if (buf.readableBytes() >= length) {
+        if (buf.readableBytes() >= length && buf.getUnsignedShort(buf.readerIndex() + length - 2) == 0x0d0a) {
             return buf.readBytes(length);
         }
 
+        int endIndex = buf.readerIndex() - 1;
+        do {
+            endIndex = buf.indexOf(endIndex + 1, buf.writerIndex(), (byte) 0x0d);
+            if (endIndex > 0 && buf.writerIndex() > endIndex + 1 && buf.getByte(endIndex + 1) == 0x0a) {
+                return buf.readBytes(endIndex + 2 - buf.readerIndex());
+            }
+        } while (endIndex > 0);
+
         return null;
     }
 
diff --git a/src/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
index 24bedcabf..fbd1adfc6 100644
--- a/src/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -31,6 +31,7 @@ import org.traccar.model.CellTower;
 import org.traccar.model.Device;
 import org.traccar.model.Network;
 import org.traccar.model.Position;
+import org.traccar.model.WifiAccessPoint;
 
 import java.net.SocketAddress;
 import java.nio.charset.StandardCharsets;
@@ -68,6 +69,8 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
     public static final int MSG_GPS_LBS_STATUS_1 = 0x16;
     public static final int MSG_GPS_LBS_STATUS_2 = 0x26;
     public static final int MSG_GPS_LBS_STATUS_3 = 0x27;
+    public static final int MSG_LBS_MULTIPLE = 0x28;
+    public static final int MSG_LBS_WIFI = 0x2C;
     public static final int MSG_LBS_PHONE = 0x17;
     public static final int MSG_LBS_EXTEND = 0x18;
     public static final int MSG_LBS_STATUS = 0x19;
@@ -152,9 +155,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             return false;
         }
 
-        int length = buf.readUnsignedByte();
-        position.set(Position.KEY_SATELLITES, BitUtil.to(length, 4));
-        length = BitUtil.from(length, 4);
+        position.set(Position.KEY_SATELLITES, BitUtil.to(buf.readUnsignedByte(), 4));
 
         double latitude = buf.readUnsignedInt() / 60.0 / 30000.0;
         double longitude = buf.readUnsignedInt() / 60.0 / 30000.0;
@@ -178,10 +179,6 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_IGNITION, BitUtil.check(flags, 15));
         }
 
-        if (length > 0) {
-            buf.skipBytes(length - 12); // skip reserved
-        }
-
         return true;
     }
 
@@ -199,7 +196,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 buf.readUnsignedShort(), buf.readUnsignedByte(), buf.readUnsignedShort(), buf.readUnsignedMedium())));
 
         if (length > 0) {
-            buf.skipBytes(length - 8);
+            buf.skipBytes(length - (hasLength ? 9 : 8));
         }
 
         return true;
@@ -336,7 +333,6 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             String imei = ChannelBuffers.hexDump(buf.readBytes(8)).substring(1);
             buf.readUnsignedShort(); // type
 
-            // Timezone offset
             if (dataLength > 10) {
                 int extensionBits = buf.readUnsignedShort();
                 int hours = (extensionBits >> 4) / 100;
@@ -391,77 +387,104 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
         } else {
 
-            Position position = new Position();
-            position.setDeviceId(deviceSession.getDeviceId());
-            position.setProtocol(getProtocolName());
-
-            if (type == MSG_LBS_EXTEND) {
+            return decodeBasicOther(channel, buf, deviceSession, type, dataLength);
 
-                DateBuilder dateBuilder = new DateBuilder(timeZone)
-                        .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
-                        .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+        }
 
-                getLastLocation(position, dateBuilder.getDate());
+        return null;
+    }
 
-                int mcc = buf.readUnsignedShort();
-                int mnc = buf.readUnsignedByte();
+    private Object decodeBasicOther(Channel channel, ChannelBuffer buf,
+            DeviceSession deviceSession, int type, int dataLength) throws Exception {
 
-                Network network = new Network();
-                for (int i = 0; i < 7; i++) {
-                    network.addCellTower(CellTower.from(
-                            mcc, mnc, buf.readUnsignedShort(), buf.readUnsignedMedium(), -buf.readUnsignedByte()));
-                }
-                position.setNetwork(network);
+        Position position = new Position();
+        position.setDeviceId(deviceSession.getDeviceId());
+        position.setProtocol(getProtocolName());
 
-            } else if (type == MSG_STRING) {
+        if (type == MSG_LBS_MULTIPLE || type == MSG_LBS_EXTEND || type == MSG_LBS_WIFI) {
 
-                getLastLocation(position, null);
+            DateBuilder dateBuilder = new DateBuilder(timeZone)
+                    .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
+                    .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
 
-                int commandLength = buf.readUnsignedByte();
+            getLastLocation(position, dateBuilder.getDate());
 
-                if (commandLength > 0) {
-                    buf.readUnsignedByte(); // server flag (reserved)
-                    position.set(Position.KEY_RESULT,
-                            buf.readBytes(commandLength - 1).toString(StandardCharsets.US_ASCII));
+            int mcc = buf.readUnsignedShort();
+            int mnc = buf.readUnsignedByte();
+            Network network = new Network();
+            for (int i = 0; i < 7; i++) {
+                int lac = buf.readUnsignedShort();
+                int cid = buf.readUnsignedMedium();
+                int rssi = -buf.readUnsignedByte();
+                if (lac > 0) {
+                    network.addCellTower(CellTower.from(mcc, mnc, lac, cid, rssi));
                 }
+            }
 
-            } else if (isSupported(type)) {
+            buf.readUnsignedByte(); // time leads
 
-                if (hasGps(type)) {
-                    decodeGps(position, buf, false);
-                } else {
-                    getLastLocation(position, null);
+            if (type != MSG_LBS_MULTIPLE) {
+                int wifiCount = buf.readUnsignedByte();
+                for (int i = 0; i < wifiCount; i++) {
+                    String mac = ChannelBuffers.hexDump(buf.readBytes(6)).replaceAll("(..)", "$1:");
+                    network.addWifiAccessPoint(WifiAccessPoint.from(
+                            mac.substring(0, mac.length() - 1), buf.readUnsignedByte()));
                 }
+            }
 
-                if (hasLbs(type)) {
-                    decodeLbs(position, buf, hasStatus(type));
-                }
+            position.setNetwork(network);
 
-                if (hasStatus(type)) {
-                    decodeStatus(position, buf);
-                }
+        } else if (type == MSG_STRING) {
 
-                if (type == MSG_GPS_LBS_1 && buf.readableBytes() == 4 + 6) {
-                    position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
-                }
+            getLastLocation(position, null);
 
+            int commandLength = buf.readUnsignedByte();
+
+            if (commandLength > 0) {
+                buf.readUnsignedByte(); // server flag (reserved)
+                position.set(Position.KEY_RESULT,
+                        buf.readBytes(commandLength - 1).toString(StandardCharsets.US_ASCII));
+            }
+
+        } else if (isSupported(type)) {
+
+            if (hasGps(type)) {
+                decodeGps(position, buf, false);
             } else {
+                getLastLocation(position, null);
+            }
 
-                buf.skipBytes(dataLength);
-                if (type != MSG_COMMAND_0 && type != MSG_COMMAND_1 && type != MSG_COMMAND_2) {
-                    sendResponse(channel, false, type);
-                }
-                return null;
+            if (hasLbs(type)) {
+                decodeLbs(position, buf, hasStatus(type));
+            }
 
+            if (hasStatus(type)) {
+                decodeStatus(position, buf);
             }
 
-            sendResponse(channel, false, type);
+            if (type == MSG_GPS_LBS_1 && buf.readableBytes() >= 4 + 6) {
+                position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
+            }
 
-            return position;
+            if (type == MSG_GPS_LBS_2 && buf.readableBytes() >= 3 + 6) {
+                position.set(Position.KEY_IGNITION, buf.readUnsignedByte() > 0);
+                position.set(Position.KEY_EVENT, buf.readUnsignedByte()); // reason
+                position.set(Position.KEY_ARCHIVE, buf.readUnsignedByte() > 0);
+            }
+
+        } else {
+
+            buf.skipBytes(dataLength);
+            if (type != MSG_COMMAND_0 && type != MSG_COMMAND_1 && type != MSG_COMMAND_2) {
+                sendResponse(channel, false, type);
+            }
+            return null;
 
         }
 
-        return null;
+        sendResponse(channel, false, type);
+
+        return position;
     }
 
     private Object decodeExtended(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) throws Exception {
@@ -509,7 +532,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             } else if (subType == 0x05) {
 
                 int flags = buf.readUnsignedByte();
-                position.set("door", BitUtil.check(flags, 0));
+                position.set(Position.KEY_DOOR, BitUtil.check(flags, 0));
                 position.set(Position.PREFIX_IO + 1, BitUtil.check(flags, 2));
                 return position;
 
@@ -533,7 +556,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             if (photo.writableBytes() > 0) {
                 sendPhotoRequest(channel, pictureId);
             } else {
-                Device device = Context.getDeviceManager().getDeviceById(deviceSession.getDeviceId());
+                Device device = Context.getDeviceManager().getById(deviceSession.getDeviceId());
                 Context.getMediaManager().writeFile(device.getUniqueId(), photo, "jpg");
                 photos.remove(pictureId);
             }
@@ -544,7 +567,9 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 getLastLocation(position, position.getDeviceTime());
             }
 
-            decodeLbs(position, buf, true);
+            if (decodeLbs(position, buf, true)) {
+                position.set(Position.KEY_RSSI, buf.readUnsignedByte());
+            }
 
             buf.skipBytes(buf.readUnsignedByte()); // additional cell towers
             buf.skipBytes(buf.readUnsignedByte()); // wifi access point
diff --git a/src/org/traccar/protocol/H02Protocol.java b/src/org/traccar/protocol/H02Protocol.java
index df64402f8..66965e9db 100644
--- a/src/org/traccar/protocol/H02Protocol.java
+++ b/src/org/traccar/protocol/H02Protocol.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,7 @@
  */
 package org.traccar.protocol;
 
+import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
 import org.jboss.netty.bootstrap.ServerBootstrap;
 import org.jboss.netty.channel.ChannelPipeline;
 import org.jboss.netty.handler.codec.string.StringEncoder;
@@ -50,5 +51,13 @@ public class H02Protocol extends BaseProtocol {
                 pipeline.addLast("objectDecoder", new H02ProtocolDecoder(H02Protocol.this));
             }
         });
+        serverList.add(new TrackerServer(new ConnectionlessBootstrap(), getName()) {
+            @Override
+            protected void addSpecificHandlers(ChannelPipeline pipeline) {
+                pipeline.addLast("stringEncoder", new StringEncoder());
+                pipeline.addLast("objectEncoder", new H02ProtocolEncoder());
+                pipeline.addLast("objectDecoder", new H02ProtocolDecoder(H02Protocol.this));
+            }
+        });
     }
 }
diff --git a/src/org/traccar/protocol/H02ProtocolDecoder.java b/src/org/traccar/protocol/H02ProtocolDecoder.java
index aa3d47650..4414870d2 100644
--- a/src/org/traccar/protocol/H02ProtocolDecoder.java
+++ b/src/org/traccar/protocol/H02ProtocolDecoder.java
@@ -150,10 +150,22 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
             .text("*")
             .expression("..,")                   // manufacturer
             .number("(d+),")                     // imei
-            .expression("[^,]+,")
-            .any()
+            .groupBegin()
+            .text("VP1,")
+            .or()
+            .groupBegin()
+            .text("V4,")
+            .expression("(.*),")                 // response
+            .or()
+            .expression("V[^,]*,")
+            .groupEnd()
             .number("(?:(dd)(dd)(dd))?,")        // time (hhmmss)
-            .expression("([AV])?,")              // validity
+            .groupEnd()
+            .groupBegin()
+            .expression("([ABV])?,")             // validity
+            .or()
+            .number("(d+),")                     // coding scheme
+            .groupEnd()
             .groupBegin()
             .number("-(d+)-(d+.d+),")            // latitude
             .or()
@@ -169,25 +181,28 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
             .number("(d+.?d*),")                 // speed
             .number("(d+.?d*)?,")                // course
             .number("(?:(dd)(dd)(dd))?")         // date (ddmmyy)
-            .any()
-            .number(",(x{8})")                   // status
+            .groupBegin()
+            .expression(",[^,]*,")
+            .expression("[^,]*,")
+            .expression("[^,]*")                 // sim info
+            .groupEnd("?")
+            .groupBegin()
+            .number(",(x{8})")
             .groupBegin()
             .number(",(d+),")                    // odometer
             .number("(-?d+),")                   // temperature
             .number("(d+.d+),")                  // fuel
             .number("(-?d+),")                   // altitude
             .number("(x+),")                     // lac
-            .number("(x+)#")                     // cid
+            .number("(x+)")                      // cid
             .or()
-            .number(",(d+),")
-            .number("(d+),")
-            .number("(d+),")
-            .number("(d+)#")
+            .text(",")
+            .expression("(.*)")                  // data
             .or()
-            .expression(",.*")
+            .groupEnd()
             .or()
-            .text("#")
             .groupEnd()
+            .text("#")
             .compile();
 
     private static final Pattern PATTERN_NBR = new PatternBuilder()
@@ -222,6 +237,24 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
             .any()
             .compile();
 
+    private static final Pattern PATTERN_V3 = new PatternBuilder()
+            .text("*")
+            .expression("..,")                   // manufacturer
+            .number("(d+),")                     // imei
+            .text("V3,")
+            .number("(dd)(dd)(dd),")             // time (hhmmss)
+            .number("(ddd)")                     // mcc
+            .number("(d+),")                     // mnc
+            .number("(d+),")                     // count
+            .expression("(.*),")                 // cell info
+            .number("(x{4}),")                   // battery
+            .number("d+,")                       // reboot info
+            .text("X,")
+            .number("(dd)(dd)(dd),")             // date (ddmmyy)
+            .number("(x{8})")                    // status
+            .text("#").optional()
+            .compile();
+
     private Position decodeText(String sentence, Channel channel, SocketAddress remoteAddress) {
 
         Parser parser = new Parser(PATTERN, sentence);
@@ -238,6 +271,10 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         position.setProtocol(getProtocolName());
         position.setDeviceId(deviceSession.getDeviceId());
 
+        if (parser.hasNext()) {
+            position.set(Position.KEY_RESULT, parser.next());
+        }
+
         DateBuilder dateBuilder = new DateBuilder();
         if (parser.hasNext(3)) {
             dateBuilder.setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
@@ -246,6 +283,10 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         if (parser.hasNext()) {
             position.setValid(parser.next().equals("A"));
         }
+        if (parser.hasNext()) {
+            parser.nextInt(); // coding scheme
+            position.setValid(true);
+        }
 
         if (parser.hasNext(2)) {
             position.setLatitude(-parser.nextCoordinate());
@@ -271,7 +312,9 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
             position.setTime(new Date());
         }
 
-        processStatus(position, parser.nextLong(16, 0));
+        if (parser.hasNext()) {
+            processStatus(position, parser.nextLong(16, 0));
+        }
 
         if (parser.hasNext(6)) {
             position.set(Position.KEY_ODOMETER, parser.nextInt(0));
@@ -284,8 +327,9 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (parser.hasNext(4)) {
-            for (int i = 1; i <= 4; i++) {
-                position.set(Position.PREFIX_IO + i, parser.nextInt(0));
+            String[] values = parser.next().split(",");
+            for (int i = 0; i < values.length; i++) {
+                position.set(Position.PREFIX_IO + (i + 1), values[i].trim());
             }
         }
 
@@ -354,7 +398,7 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         position.set(Position.KEY_RSSI, parser.nextInt());
         position.set(Position.KEY_SATELLITES, parser.nextInt());
         position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt());
-        position.set("steps", parser.nextInt());
+        position.set(Position.KEY_STEPS, parser.nextInt());
         position.set("turnovers", parser.nextInt());
 
         dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
@@ -366,6 +410,48 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
+    private Position decodeV3(String sentence, Channel channel, SocketAddress remoteAddress) {
+
+        Parser parser = new Parser(PATTERN_V3, sentence);
+        if (!parser.matches()) {
+            return null;
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
+        if (deviceSession == null) {
+            return null;
+        }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        DateBuilder dateBuilder = new DateBuilder()
+                .setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
+
+        int mcc = parser.nextInt();
+        int mnc = parser.nextInt();
+
+        int count = parser.nextInt();
+        Network network = new Network();
+        String[] values = parser.next().split(",");
+        for (int i = 0; i < count; i++) {
+            network.addCellTower(CellTower.from(
+                    mcc, mnc, Integer.parseInt(values[i * 4]), Integer.parseInt(values[i * 4 + 1])));
+        }
+        position.setNetwork(network);
+
+        position.set(Position.KEY_BATTERY, parser.nextHexInt());
+
+        dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
+
+        getLastLocation(position, dateBuilder.getDate());
+
+        processStatus(position, parser.nextLong(16, 0));
+
+        return position;
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
@@ -385,6 +471,8 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
                             return decodeLbs(sentence, channel, remoteAddress);
                         case "LINK":
                             return decodeLink(sentence, channel, remoteAddress);
+                        case "V3":
+                            return decodeV3(sentence, channel, remoteAddress);
                         default:
                             return decodeText(sentence, channel, remoteAddress);
                     }
diff --git a/src/org/traccar/protocol/Jt600ProtocolDecoder.java b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
index 2bd02d3f1..f76fd8069 100644
--- a/src/org/traccar/protocol/Jt600ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.DeviceSession;
 import org.traccar.helper.BcdUtil;
+import org.traccar.helper.BitUtil;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
 import org.traccar.helper.PatternBuilder;
@@ -31,6 +32,8 @@ import org.traccar.model.Position;
 
 import java.net.SocketAddress;
 import java.nio.charset.StandardCharsets;
+import java.util.LinkedList;
+import java.util.List;
 import java.util.regex.Pattern;
 
 public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
@@ -45,10 +48,9 @@ public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
         return degrees + minutes / 60;
     }
 
-    private Position decodeBinary(ChannelBuffer buf, Channel channel, SocketAddress remoteAddress) {
+    private List<Position> decodeBinary(ChannelBuffer buf, Channel channel, SocketAddress remoteAddress) {
 
-        Position position = new Position();
-        position.setProtocol(getProtocolName());
+        List<Position> positions = new LinkedList<>();
 
         buf.readByte(); // header
 
@@ -59,97 +61,106 @@ public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
         if (deviceSession == null) {
             return null;
         }
-        position.setDeviceId(deviceSession.getDeviceId());
 
         if (longFormat) {
             buf.readUnsignedByte(); // protocol
         }
 
-        int version = buf.readUnsignedByte() >> 4;
+        int version = BitUtil.from(buf.readUnsignedByte(), 4);
         buf.readUnsignedShort(); // length
 
-        DateBuilder dateBuilder = new DateBuilder()
-                .setDay(BcdUtil.readInteger(buf, 2))
-                .setMonth(BcdUtil.readInteger(buf, 2))
-                .setYear(BcdUtil.readInteger(buf, 2))
-                .setHour(BcdUtil.readInteger(buf, 2))
-                .setMinute(BcdUtil.readInteger(buf, 2))
-                .setSecond(BcdUtil.readInteger(buf, 2));
-        position.setTime(dateBuilder.getDate());
-
-        double latitude = convertCoordinate(BcdUtil.readInteger(buf, 8));
-        double longitude = convertCoordinate(BcdUtil.readInteger(buf, 9));
-
-        byte flags = buf.readByte();
-        position.setValid((flags & 0x1) == 0x1);
-        if ((flags & 0x2) == 0) {
-            latitude = -latitude;
-        }
-        position.setLatitude(latitude);
-        if ((flags & 0x4) == 0) {
-            longitude = -longitude;
-        }
-        position.setLongitude(longitude);
+        while (buf.readableBytes() > 1) {
 
-        position.setSpeed(BcdUtil.readInteger(buf, 2));
-        position.setCourse(buf.readUnsignedByte() * 2.0);
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
 
-        if (longFormat) {
+            DateBuilder dateBuilder = new DateBuilder()
+                    .setDay(BcdUtil.readInteger(buf, 2))
+                    .setMonth(BcdUtil.readInteger(buf, 2))
+                    .setYear(BcdUtil.readInteger(buf, 2))
+                    .setHour(BcdUtil.readInteger(buf, 2))
+                    .setMinute(BcdUtil.readInteger(buf, 2))
+                    .setSecond(BcdUtil.readInteger(buf, 2));
+            position.setTime(dateBuilder.getDate());
 
-            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
-            position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
+            double latitude = convertCoordinate(BcdUtil.readInteger(buf, 8));
+            double longitude = convertCoordinate(BcdUtil.readInteger(buf, 9));
 
-            buf.readUnsignedInt(); // vehicle id combined
+            byte flags = buf.readByte();
+            position.setValid((flags & 0x1) == 0x1);
+            if ((flags & 0x2) == 0) {
+                latitude = -latitude;
+            }
+            position.setLatitude(latitude);
+            if ((flags & 0x4) == 0) {
+                longitude = -longitude;
+            }
+            position.setLongitude(longitude);
 
-            position.set(Position.KEY_STATUS, buf.readUnsignedShort());
+            position.setSpeed(BcdUtil.readInteger(buf, 2));
+            position.setCourse(buf.readUnsignedByte() * 2.0);
 
-            int battery = buf.readUnsignedByte();
-            if (battery == 0xff) {
-                position.set(Position.KEY_CHARGE, true);
-            } else {
-                position.set(Position.KEY_BATTERY_LEVEL, battery);
-            }
+            if (longFormat) {
+
+                position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
+                position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
 
-            CellTower cellTower = CellTower.fromCidLac(buf.readUnsignedShort(), buf.readUnsignedShort());
-            cellTower.setSignalStrength((int) buf.readUnsignedByte());
-            position.setNetwork(new Network(cellTower));
+                buf.readUnsignedInt(); // vehicle id combined
 
-            position.set(Position.KEY_INDEX, buf.readUnsignedByte());
+                position.set(Position.KEY_STATUS, buf.readUnsignedShort());
 
-        } else if (version == 1) {
+                int battery = buf.readUnsignedByte();
+                if (battery == 0xff) {
+                    position.set(Position.KEY_CHARGE, true);
+                } else {
+                    position.set(Position.KEY_BATTERY_LEVEL, battery);
+                }
 
-            position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
-            position.set(Position.KEY_POWER, buf.readUnsignedByte());
+                CellTower cellTower = CellTower.fromCidLac(buf.readUnsignedShort(), buf.readUnsignedShort());
+                cellTower.setSignalStrength((int) buf.readUnsignedByte());
+                position.setNetwork(new Network(cellTower));
 
-            buf.readByte(); // other flags and sensors
+            } else if (version == 1) {
 
-            position.setAltitude(buf.readUnsignedShort());
+                position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
+                position.set(Position.KEY_POWER, buf.readUnsignedByte());
 
-            int cid  = buf.readUnsignedShort();
-            int lac  = buf.readUnsignedShort();
-            int rssi = buf.readUnsignedByte();
+                buf.readByte(); // other flags and sensors
 
-            if (cid != 0 && lac != 0) {
-                CellTower cellTower = CellTower.fromCidLac(cid, lac);
-                cellTower.setSignalStrength(rssi);
-                position.setNetwork(new Network(cellTower));
-            } else {
-                position.set(Position.KEY_RSSI, rssi);
-            }
+                position.setAltitude(buf.readUnsignedShort());
+
+                int cid = buf.readUnsignedShort();
+                int lac = buf.readUnsignedShort();
+                int rssi = buf.readUnsignedByte();
+
+                if (cid != 0 && lac != 0) {
+                    CellTower cellTower = CellTower.fromCidLac(cid, lac);
+                    cellTower.setSignalStrength(rssi);
+                    position.setNetwork(new Network(cellTower));
+                } else {
+                    position.set(Position.KEY_RSSI, rssi);
+                }
 
-        } else if (version == 2) {
+            } else if (version == 2) {
 
-            int fuel = buf.readUnsignedByte() << 8;
+                int fuel = buf.readUnsignedByte() << 8;
 
-            position.set(Position.KEY_STATUS, buf.readUnsignedInt());
-            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
+                position.set(Position.KEY_STATUS, buf.readUnsignedInt());
+                position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
 
-            fuel += buf.readUnsignedByte();
-            position.set(Position.KEY_FUEL_LEVEL, fuel);
+                fuel += buf.readUnsignedByte();
+                position.set(Position.KEY_FUEL_LEVEL, fuel);
+
+            }
+
+            positions.add(position);
 
         }
 
-        return position;
+        buf.readUnsignedByte(); // index
+
+        return positions;
     }
 
     private static final Pattern PATTERN_W01 = new PatternBuilder()
diff --git a/src/org/traccar/protocol/Jt600ProtocolEncoder.java b/src/org/traccar/protocol/Jt600ProtocolEncoder.java
index 0bf389460..377f104a3 100644
--- a/src/org/traccar/protocol/Jt600ProtocolEncoder.java
+++ b/src/org/traccar/protocol/Jt600ProtocolEncoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
  */
 package org.traccar.protocol;
 
+import java.util.TimeZone;
+
 import org.traccar.StringProtocolEncoder;
 import org.traccar.helper.Log;
 import org.traccar.model.Command;
@@ -29,7 +31,7 @@ public class Jt600ProtocolEncoder extends StringProtocolEncoder {
             case Command.TYPE_ENGINE_RESUME:
                 return "(S07,1)";
             case Command.TYPE_SET_TIMEZONE:
-                int offset = command.getInteger(Command.KEY_TIMEZONE) / 60;
+                int offset = TimeZone.getTimeZone(command.getString(Command.KEY_TIMEZONE)).getRawOffset() / 60000;
                 return "(S09,1," + offset + ")";
             case Command.TYPE_REBOOT_DEVICE:
                 return "(S17)";
diff --git a/src/org/traccar/protocol/MegastekProtocolDecoder.java b/src/org/traccar/protocol/MegastekProtocolDecoder.java
index 15a384cc0..3ef52acd1 100644
--- a/src/org/traccar/protocol/MegastekProtocolDecoder.java
+++ b/src/org/traccar/protocol/MegastekProtocolDecoder.java
@@ -267,7 +267,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             .or().text(" ")
             .groupEnd("?").text(",")
             .number("(d+)?,")                    // rfid
-            .number("d*,")
+            .expression("[^,]*,")
             .number("(d+)?,")                    // battery
             .expression("([^,]*);")              // alert
             .any()
@@ -280,13 +280,13 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             return null;
         }
 
-        Position position = new Position();
-        position.setProtocol(getProtocolName());
-
         DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
         if (deviceSession == null) {
             return null;
         }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
         position.setDeviceId(deviceSession.getDeviceId());
 
         if (parser.next().equals("S")) {
@@ -327,7 +327,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             }
         }
 
-        position.set(Position.KEY_RFID, parser.next());
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
 
         String battery = parser.next();
         if (battery != null) {
diff --git a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
index 44e01d5e0..e41a42843 100644
--- a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
@@ -94,8 +94,8 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
             .number("(d+.d+),")                  // single fuel consumption
             .number("(d+.d+),")                  // total fuel consumption
             .number("(d+),")                     // error code count
-            .number("(d+),")                     // harsh acceleration count
-            .number("(d+)")                      // harsh break count
+            .number("(d+),")                     // hard acceleration count
+            .number("(d+)")                      // hard brake count
             .compile();
 
     private static final Pattern PATTERN_OBDA = new PatternBuilder()
@@ -106,8 +106,8 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
             .number("(d+),")                     // average speed
             .number("(d+),")                     // history highest speed
             .number("(d+),")                     // history highest rpm
-            .number("(d+),")                     // total harsh acceleration
-            .number("(d+)")                      // total harsh break n0
+            .number("(d+),")                     // total hard acceleration
+            .number("(d+)")                      // total hard brake
             .compile();
 
     public static final int MSG_HEARTBEAT = 0x0001;
@@ -194,10 +194,16 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
                 return Position.ALARM_MOVEMENT;
             case 0x13:
                 return Position.ALARM_GEOFENCE_ENTER;
+            case 0x14:
+                return Position.ALARM_ACCIDENT;
             case 0x50:
                 return Position.ALARM_POWER_OFF;
             case 0x53:
                 return Position.ALARM_GPS_ANTENNA_CUT;
+            case 0x72:
+                return Position.ALARM_BRAKING;
+            case 0x73:
+                return Position.ALARM_ACCELERATION;
             default:
                 return null;
         }
@@ -253,7 +259,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (parser.hasNext()) {
-            position.set(Position.KEY_RFID, parser.nextHexInt(0));
+            position.set(Position.KEY_DRIVER_UNIQUE_ID, String.valueOf(parser.nextHexInt(0)));
         }
 
         return position;
@@ -295,8 +301,8 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         position.set("singleFuelConsumption", parser.nextDouble());
         position.set("totalFuelConsumption", parser.nextDouble());
         position.set(Position.KEY_DTCS, parser.nextInt());
-        position.set("harshAcelerationNo", parser.nextInt());
-        position.set("harshBreakerNo", parser.nextInt());
+        position.set("hardAccelerationCount", parser.nextInt());
+        position.set("hardBrakingCount", parser.nextInt());
 
         return position;
     }
@@ -353,7 +359,13 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         position.setProtocol(getProtocolName());
 
         if (command == MSG_ALARM) {
-            position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
+            short alarmCode = buf.readUnsignedByte();
+            position.set(Position.KEY_ALARM, decodeAlarm(alarmCode));
+            if (alarmCode >= 0x02 && alarmCode <= 0x05) {
+                position.set(Position.PREFIX_IN + alarmCode, 1);
+            } else if (alarmCode >= 0x32 && alarmCode <= 0x35) {
+                position.set(Position.PREFIX_IN + (alarmCode - 0x30), 0);
+            }
         } else if (command == MSG_POSITION_LOGGED) {
             buf.skipBytes(6);
         }
@@ -370,7 +382,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
                 if (rfid != 0) {
                     String card = String.format("%010d", rfid);
                     position.set("card" + (i + 1), card);
-                    position.set(Position.KEY_RFID, card);
+                    position.set(Position.KEY_DRIVER_UNIQUE_ID, card);
                 }
             }
         }
diff --git a/src/org/traccar/protocol/MeiligaoProtocolEncoder.java b/src/org/traccar/protocol/MeiligaoProtocolEncoder.java
index 268bae392..2e0a1e84c 100644
--- a/src/org/traccar/protocol/MeiligaoProtocolEncoder.java
+++ b/src/org/traccar/protocol/MeiligaoProtocolEncoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ import org.traccar.model.Command;
 
 import javax.xml.bind.DatatypeConverter;
 import java.nio.charset.StandardCharsets;
+import java.util.TimeZone;
 
 public class MeiligaoProtocolEncoder extends BaseProtocolEncoder {
 
@@ -78,7 +79,7 @@ public class MeiligaoProtocolEncoder extends BaseProtocolEncoder {
                 content.writeShort(command.getInteger(Command.KEY_RADIUS));
                 return encodeContent(command.getDeviceId(), MSG_MOVEMENT_ALARM, content);
             case Command.TYPE_SET_TIMEZONE:
-                int offset = command.getInteger(Command.KEY_TIMEZONE) / 60;
+                int offset = TimeZone.getTimeZone(command.getString(Command.KEY_TIMEZONE)).getRawOffset() / 60000;
                 content.writeBytes(String.valueOf(offset).getBytes(StandardCharsets.US_ASCII));
                 return encodeContent(command.getDeviceId(), MSG_TIME_ZONE, content);
             case Command.TYPE_REBOOT_DEVICE:
diff --git a/src/org/traccar/protocol/MeitrackProtocolDecoder.java b/src/org/traccar/protocol/MeitrackProtocolDecoder.java
index 38ecde519..efc9c24db 100644
--- a/src/org/traccar/protocol/MeitrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeitrackProtocolDecoder.java
@@ -20,6 +20,7 @@ import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.Context;
 import org.traccar.DeviceSession;
+import org.traccar.helper.Checksum;
 import org.traccar.helper.Parser;
 import org.traccar.helper.PatternBuilder;
 import org.traccar.helper.UnitsConverter;
@@ -69,16 +70,15 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             .number("(x+)?|")                    // adc2
             .number("(x+)?|")                    // adc3
             .number("(x+)|")                     // battery
-            .number("(x+),")                     // power
+            .number("(x+)?,")                    // power
             .groupBegin()
             .expression("([^,]+)?,")             // event specific
             .expression("[^,]*,")                // reserved
-            .number("d*,")                       // protocol
+            .number("(d+)?,")                    // protocol
             .number("(x{4})?")                   // fuel
             .number("(?:,(x{6}(?:|x{6})*))?")    // temperature
-            .or()
+            .groupEnd("?")
             .any()
-            .groupEnd()
             .text("*")
             .number("xx")
             .text("\r\n").optional()
@@ -160,7 +160,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             }
         }
 
-        String deviceModel = Context.getIdentityManager().getDeviceById(deviceSession.getDeviceId()).getModel();
+        String deviceModel = Context.getIdentityManager().getById(deviceSession.getDeviceId()).getModel();
         if (deviceModel == null) {
             deviceModel = "";
         }
@@ -201,7 +201,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         if (eventData != null && !eventData.isEmpty()) {
             switch (event) {
                 case 37:
-                    position.set(Position.KEY_RFID, eventData);
+                    position.set(Position.KEY_DRIVER_UNIQUE_ID, eventData);
                     break;
                 default:
                     position.set("eventData", eventData);
@@ -209,6 +209,8 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             }
         }
 
+        int protocol = parser.nextInt(0);
+
         if (parser.hasNext()) {
             String fuel = parser.next();
             position.set(Position.KEY_FUEL_LEVEL,
@@ -218,9 +220,14 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         if (parser.hasNext()) {
             for (String temp : parser.next().split("\\|")) {
                 int index = Integer.valueOf(temp.substring(0, 2), 16);
-                double value = Byte.valueOf(temp.substring(2, 4), 16);
-                value += (value < 0 ? -0.01 : 0.01) * Integer.valueOf(temp.substring(4), 16);
-                position.set(Position.PREFIX_TEMP + index, value);
+                if (protocol >= 3) {
+                    double value = Short.valueOf(temp.substring(2), 16);
+                    position.set(Position.PREFIX_TEMP + index, value * 0.01);
+                } else {
+                    double value = Byte.valueOf(temp.substring(2, 4), 16);
+                    value += (value < 0 ? -0.01 : 0.01) * Integer.valueOf(temp.substring(4), 16);
+                    position.set(Position.PREFIX_TEMP + index, value);
+                }
             }
         }
 
@@ -307,7 +314,6 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
 
         ChannelBuffer buf = (ChannelBuffer) msg;
 
-        // Find type
         int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) ',');
         index = buf.indexOf(index + 1, buf.writerIndex(), (byte) ',');
 
@@ -316,8 +322,12 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             case "D03":
                 if (channel != null) {
                     DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
-                    String imei = Context.getIdentityManager().getDeviceById(deviceSession.getDeviceId()).getUniqueId();
-                    channel.write("@@O46," + imei + ",D00,camera_picture.jpg,0*00\r\n");
+                    String imei = Context.getIdentityManager().getById(deviceSession.getDeviceId()).getUniqueId();
+                    String content = "D00,camera_picture.jpg,0";
+                    int length = 1 + imei.length() + 1 + content.length() + 5;
+                    String response = String.format("@@O%02d,%s,%s*", length, imei, content);
+                    response += Checksum.sum(response) + "\r\n";
+                    channel.write(response);
                 }
                 return null;
             case "CCC":
diff --git a/src/org/traccar/protocol/MiniFinderProtocolDecoder.java b/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
index 8bfb4fb36..05994b697 100644
--- a/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
+++ b/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
@@ -133,7 +133,11 @@ public class MiniFinderProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         if (sentence.startsWith("!1,")) {
-            getDeviceSession(channel, remoteAddress, sentence.substring(3, sentence.length()));
+            int index = sentence.indexOf(',', 3);
+            if (index < 0) {
+                index = sentence.length();
+            }
+            getDeviceSession(channel, remoteAddress, sentence.substring(3, index));
             return null;
         }
 
diff --git a/src/org/traccar/protocol/MiniFinderProtocolEncoder.java b/src/org/traccar/protocol/MiniFinderProtocolEncoder.java
index e5c43e29a..486f406a5 100644
--- a/src/org/traccar/protocol/MiniFinderProtocolEncoder.java
+++ b/src/org/traccar/protocol/MiniFinderProtocolEncoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
  */
 package org.traccar.protocol;
 
+import java.util.TimeZone;
+
 import org.traccar.StringProtocolEncoder;
 import org.traccar.helper.Log;
 import org.traccar.model.Command;
@@ -27,7 +29,7 @@ public class MiniFinderProtocolEncoder extends StringProtocolEncoder implements
         if (key.equals(Command.KEY_ENABLE)) {
             return (Boolean) value ? "1" : "0";
         } else if (key.equals(Command.KEY_TIMEZONE)) {
-            return String.format("%+03d", ((Number) value).longValue() / 3600);
+            return String.format("%+03d", TimeZone.getTimeZone((String) value).getRawOffset() / 3600000);
         } else if (key.equals(Command.KEY_INDEX)) {
             switch (((Number) value).intValue()) {
                 case 0:
diff --git a/src/org/traccar/protocol/MxtProtocolDecoder.java b/src/org/traccar/protocol/MxtProtocolDecoder.java
index 49987ce57..6d82e4a4b 100644
--- a/src/org/traccar/protocol/MxtProtocolDecoder.java
+++ b/src/org/traccar/protocol/MxtProtocolDecoder.java
@@ -159,7 +159,7 @@ public class MxtProtocolDecoder extends BaseProtocolDecoder {
             }
 
             if (BitUtil.check(infoGroups, 7)) {
-                position.set(Position.KEY_RFID, buf.readUnsignedInt());
+                position.set(Position.KEY_DRIVER_UNIQUE_ID, String.valueOf(buf.readUnsignedInt()));
             }
 
             buf.readerIndex(buf.writerIndex() - 3);
diff --git a/src/org/traccar/protocol/OsmAndProtocolDecoder.java b/src/org/traccar/protocol/OsmAndProtocolDecoder.java
index 15f6f40b8..15a71c88b 100644
--- a/src/org/traccar/protocol/OsmAndProtocolDecoder.java
+++ b/src/org/traccar/protocol/OsmAndProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2013 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -110,7 +110,7 @@ public class OsmAndProtocolDecoder extends BaseProtocolDecoder {
                     position.setLongitude(Double.parseDouble(location[1]));
                     break;
                 case "speed":
-                    position.setSpeed(Double.parseDouble(value));
+                    position.setSpeed(convertSpeed(Double.parseDouble(value), "kn"));
                     break;
                 case "bearing":
                 case "heading":
@@ -128,11 +128,24 @@ public class OsmAndProtocolDecoder extends BaseProtocolDecoder {
                 case "batt":
                     position.set(Position.KEY_BATTERY_LEVEL, Double.parseDouble(value));
                     break;
+                case "driverUniqueId":
+                    position.set(Position.KEY_DRIVER_UNIQUE_ID, value);
+                    break;
                 default:
                     try {
                         position.set(entry.getKey(), Double.parseDouble(value));
                     } catch (NumberFormatException e) {
-                        position.set(entry.getKey(), value);
+                        switch (value) {
+                            case "true":
+                                position.set(entry.getKey(), true);
+                                break;
+                            case "false":
+                                position.set(entry.getKey(), false);
+                                break;
+                            default:
+                                position.set(entry.getKey(), value);
+                                break;
+                        }
                     }
                     break;
             }
diff --git a/src/org/traccar/protocol/Pt502ProtocolDecoder.java b/src/org/traccar/protocol/Pt502ProtocolDecoder.java
index b1851f8ca..fef5d9b39 100644
--- a/src/org/traccar/protocol/Pt502ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Pt502ProtocolDecoder.java
@@ -67,7 +67,7 @@ public class Pt502ProtocolDecoder extends BaseProtocolDecoder {
             case "HDA":

                 return Position.ALARM_ACCELERATION;

             case "HDB":

-                return Position.ALARM_BREAKING;

+                return Position.ALARM_BRAKING;

             case "FDA":

                 return Position.ALARM_FATIGUE_DRIVING;

             case "SKA":

@@ -129,7 +129,7 @@ public class Pt502ProtocolDecoder extends BaseProtocolDecoder {
         }

 

         position.set(Position.KEY_ODOMETER, parser.nextInt(0));

-        position.set(Position.KEY_RFID, parser.next());

+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());

 

         if (parser.hasNext()) {

             int value = parser.nextHexInt(0);

diff --git a/src/org/traccar/protocol/Pt502ProtocolEncoder.java b/src/org/traccar/protocol/Pt502ProtocolEncoder.java
index 5f7665e50..4a876f6da 100644
--- a/src/org/traccar/protocol/Pt502ProtocolEncoder.java
+++ b/src/org/traccar/protocol/Pt502ProtocolEncoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,11 +15,27 @@
  */
 package org.traccar.protocol;
 
+import java.util.TimeZone;
+
 import org.traccar.StringProtocolEncoder;
 import org.traccar.helper.Log;
 import org.traccar.model.Command;
 
-public class Pt502ProtocolEncoder extends StringProtocolEncoder {
+public class Pt502ProtocolEncoder extends StringProtocolEncoder implements StringProtocolEncoder.ValueFormatter {
+
+    @Override
+    public String formatValue(String key, Object value) {
+        if (key.equals(Command.KEY_TIMEZONE)) {
+            return String.valueOf(TimeZone.getTimeZone((String) value).getRawOffset() / 3600000);
+        }
+
+        return null;
+    }
+
+    @Override
+    protected String formatCommand(Command command, String format, String... keys) {
+        return formatCommand(command, format, this, keys);
+    }
 
     @Override
     protected Object encodeCommand(Command command) {
diff --git a/src/org/traccar/protocol/RuptelaProtocolDecoder.java b/src/org/traccar/protocol/RuptelaProtocolDecoder.java
index ac95ed27a..8752d30c0 100644
--- a/src/org/traccar/protocol/RuptelaProtocolDecoder.java
+++ b/src/org/traccar/protocol/RuptelaProtocolDecoder.java
@@ -74,6 +74,43 @@ public class RuptelaProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
+    private long readValue(ChannelBuffer buf, int length, boolean signed) {
+        switch (length) {
+            case 1:
+                return signed ? buf.readByte() : buf.readUnsignedByte();
+            case 2:
+                return signed ? buf.readShort() : buf.readUnsignedShort();
+            case 4:
+                return signed ? buf.readInt() : buf.readUnsignedInt();
+            default:
+                return buf.readLong();
+        }
+    }
+
+    private void decodeParameter(Position position, int id, ChannelBuffer buf, int length) {
+        switch (id) {
+            case 2:
+            case 3:
+            case 4:
+                position.set("di" + (id - 1), readValue(buf, length, false));
+                break;
+            case 5:
+                position.set(Position.KEY_IGNITION, readValue(buf, length, false) == 1);
+                break;
+            case 74:
+                position.set(Position.PREFIX_TEMP + 3, readValue(buf, length, true) * 0.1);
+                break;
+            case 78:
+            case 79:
+            case 80:
+                position.set(Position.PREFIX_TEMP + (id - 78), readValue(buf, length, true) * 0.1);
+                break;
+            default:
+                position.set(Position.PREFIX_IO + id, readValue(buf, length, false));
+                break;
+        }
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
@@ -133,28 +170,28 @@ public class RuptelaProtocolDecoder extends BaseProtocolDecoder {
                 int cnt = buf.readUnsignedByte();
                 for (int j = 0; j < cnt; j++) {
                     int id = type == MSG_EXTENDED_RECORDS ? buf.readUnsignedShort() : buf.readUnsignedByte();
-                    position.set(Position.PREFIX_IO + id, buf.readUnsignedByte());
+                    decodeParameter(position, id, buf, 1);
                 }
 
                 // Read 2 byte data
                 cnt = buf.readUnsignedByte();
                 for (int j = 0; j < cnt; j++) {
                     int id = type == MSG_EXTENDED_RECORDS ? buf.readUnsignedShort() : buf.readUnsignedByte();
-                    position.set(Position.PREFIX_IO + id, buf.readUnsignedShort());
+                    decodeParameter(position, id, buf, 2);
                 }
 
                 // Read 4 byte data
                 cnt = buf.readUnsignedByte();
                 for (int j = 0; j < cnt; j++) {
                     int id = type == MSG_EXTENDED_RECORDS ? buf.readUnsignedShort() : buf.readUnsignedByte();
-                    position.set(Position.PREFIX_IO + id, buf.readUnsignedInt());
+                    decodeParameter(position, id, buf, 4);
                 }
 
                 // Read 8 byte data
                 cnt = buf.readUnsignedByte();
                 for (int j = 0; j < cnt; j++) {
                     int id = type == MSG_EXTENDED_RECORDS ? buf.readUnsignedShort() : buf.readUnsignedByte();
-                    position.set(Position.PREFIX_IO + id, buf.readLong());
+                    decodeParameter(position, id, buf, 8);
                 }
 
                 positions.add(position);
diff --git a/src/org/traccar/protocol/StarLinkProtocolDecoder.java b/src/org/traccar/protocol/StarLinkProtocolDecoder.java
index e90dde455..79f013fac 100644
--- a/src/org/traccar/protocol/StarLinkProtocolDecoder.java
+++ b/src/org/traccar/protocol/StarLinkProtocolDecoder.java
@@ -69,6 +69,29 @@ public class StarLinkProtocolDecoder extends BaseProtocolDecoder {
         return value.charAt(0) == '+' ? result : -result;
     }
 
+    private String decodeAlarm(int event) {
+        switch (event) {
+            case 6:
+                return Position.ALARM_OVERSPEED;
+            case 7:
+                return Position.ALARM_GEOFENCE_ENTER;
+            case 8:
+                return Position.ALARM_GEOFENCE_EXIT;
+            case 9:
+                return Position.ALARM_POWER_CUT;
+            case 11:
+                return Position.ALARM_LOW_BATTERY;
+            case 26:
+                return Position.ALARM_TOW;
+            case 36:
+                return Position.ALARM_SOS;
+            case 42:
+                return Position.ALARM_JAMMING;
+            default:
+                return null;
+        }
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
@@ -109,6 +132,7 @@ public class StarLinkProtocolDecoder extends BaseProtocolDecoder {
                     break;
                 case "#EID#":
                     event = Integer.parseInt(data[i]);
+                    position.set(Position.KEY_ALARM, decodeAlarm(event));
                     position.set(Position.KEY_EVENT, event);
                     break;
                 case "#PDT#":
@@ -196,7 +220,7 @@ public class StarLinkProtocolDecoder extends BaseProtocolDecoder {
             if (rfid.matches("0+")) {
                 rfid = data[data.length - 2];
             }
-            position.set(Position.KEY_RFID, rfid);
+            position.set(Position.KEY_DRIVER_UNIQUE_ID, rfid);
         }
 
         return position;
diff --git a/src/org/traccar/protocol/Stl060ProtocolDecoder.java b/src/org/traccar/protocol/Stl060ProtocolDecoder.java
index c81e83aab..26817a5c8 100644
--- a/src/org/traccar/protocol/Stl060ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Stl060ProtocolDecoder.java
@@ -104,7 +104,7 @@ public class Stl060ProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_CHARGE, parser.nextInt(0) == 1);
             position.set(Position.KEY_IGNITION, parser.nextInt(0) == 1);
             position.set(Position.KEY_INPUT, parser.nextInt(0));
-            position.set(Position.KEY_RFID, parser.next());
+            position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
             position.set(Position.KEY_ODOMETER, parser.nextInt(0));
             position.set(Position.PREFIX_TEMP + 1, parser.nextInt(0));
             position.set(Position.KEY_FUEL_LEVEL, parser.nextInt(0));
diff --git a/src/org/traccar/protocol/SuntechProtocolDecoder.java b/src/org/traccar/protocol/SuntechProtocolDecoder.java
index 42e81f60c..6dfc6f77f 100644
--- a/src/org/traccar/protocol/SuntechProtocolDecoder.java
+++ b/src/org/traccar/protocol/SuntechProtocolDecoder.java
@@ -19,6 +19,7 @@ import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.Context;
 import org.traccar.DeviceSession;
+import org.traccar.helper.BitUtil;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Position;
 
@@ -32,18 +33,34 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
 
     private int protocolType;
     private boolean hbm;
+    private boolean includeAdc;
+    private boolean includeTemp;
 
     public SuntechProtocolDecoder(SuntechProtocol protocol) {
         super(protocol);
 
         protocolType = Context.getConfig().getInteger(getProtocolName() + ".protocolType");
         hbm = Context.getConfig().getBoolean(getProtocolName() + ".hbm");
+        includeAdc = Context.getConfig().getBoolean(getProtocolName() + ".includeAdc");
+        includeTemp = Context.getConfig().getBoolean(getProtocolName() + ".includeTemp");
     }
 
     public void setProtocolType(int protocolType) {
         this.protocolType = protocolType;
     }
 
+    public void setHbm(boolean hbm) {
+        this.hbm = hbm;
+    }
+
+    public void setIncludeAdc(boolean includeAdc) {
+        this.includeAdc = includeAdc;
+    }
+
+    public void setIncludeTemp(boolean includeTemp) {
+        this.includeTemp = includeTemp;
+    }
+
     private Position decode9(
             Channel channel, SocketAddress remoteAddress, String[] values) throws ParseException {
         int index = 1;
@@ -54,19 +71,19 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
             return null;
         }
 
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, values[index++]);
+        if (deviceSession == null) {
+            return null;
+        }
+
         Position position = new Position();
         position.setProtocol(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
 
         if (type.equals("Emergency") || type.equals("Alert")) {
             position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
         }
 
-        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, values[index++]);
-        if (deviceSession == null) {
-            return null;
-        }
-        position.setDeviceId(deviceSession.getDeviceId());
-
         if (!type.equals("Alert") || protocolType == 0) {
             position.set(Position.KEY_VERSION_FW, values[index++]);
         }
@@ -87,13 +104,60 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         position.setValid(values[index++].equals("1"));
 
         if (protocolType == 1) {
-            position.set(Position.KEY_ODOMETER, Integer.parseInt(values[index]));
+            position.set(Position.KEY_ODOMETER, Integer.parseInt(values[index++]));
         }
 
         return position;
     }
 
-    private Position decode23(
+    private String decodeEmergency(int value) {
+        switch (value) {
+            case 1:
+                return Position.ALARM_SOS;
+            case 2:
+                return Position.ALARM_PARKING;
+            case 3:
+                return Position.ALARM_POWER_CUT;
+            case 5:
+            case 6:
+                return Position.ALARM_DOOR;
+            case 7:
+                return Position.ALARM_MOVEMENT;
+            case 8:
+                return Position.ALARM_SHOCK;
+            default:
+                return null;
+        }
+    }
+
+    private String decodeAlert(int value) {
+        switch (value) {
+            case 1:
+                return Position.ALARM_OVERSPEED;
+            case 5:
+                return Position.ALARM_GEOFENCE_EXIT;
+            case 6:
+                return Position.ALARM_GEOFENCE_ENTER;
+            case 14:
+                return Position.ALARM_LOW_BATTERY;
+            case 15:
+                return Position.ALARM_SHOCK;
+            case 16:
+                return Position.ALARM_ACCIDENT;
+            case 46:
+                return Position.ALARM_ACCELERATION;
+            case 47:
+                return Position.ALARM_BRAKING;
+            case 48:
+                return Position.ALARM_ACCIDENT;
+            case 50:
+                return Position.ALARM_JAMMING;
+            default:
+                return null;
+        }
+    }
+
+    private Position decode235(
             Channel channel, SocketAddress remoteAddress, String protocol, String[] values) throws ParseException {
         int index = 0;
 
@@ -103,20 +167,17 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
             return null;
         }
 
-        Position position = new Position();
-        position.setProtocol(getProtocolName());
-
-        if (type.equals("EMG") || type.equals("ALT")) {
-            position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
-        }
-
         DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, values[index++]);
         if (deviceSession == null) {
             return null;
         }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
         position.setDeviceId(deviceSession.getDeviceId());
+        position.set(Position.KEY_TYPE, type);
 
-        if (protocol.equals("ST300")) {
+        if (protocol.equals("ST300") || protocol.equals("ST500")) {
             index += 1; // model
         }
 
@@ -126,7 +187,9 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
         position.setTime(dateFormat.parse(values[index++] + values[index++]));
 
-        index += 1; // cell
+        if (!protocol.equals("ST500")) {
+            index += 1; // cell
+        }
 
         position.setLatitude(Double.parseDouble(values[index++]));
         position.setLongitude(Double.parseDouble(values[index++]));
@@ -140,12 +203,32 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         position.set(Position.KEY_ODOMETER, Integer.parseInt(values[index++]));
         position.set(Position.KEY_POWER, Double.parseDouble(values[index++]));
 
-        position.set(Position.PREFIX_IO + 1, values[index++]);
-
-        index += 1; // mode
+        String io = values[index++];
+        if (io.length() == 6) {
+            position.set(Position.KEY_IGNITION, io.charAt(0) == '1');
+            position.set(Position.PREFIX_IN + 1, io.charAt(1) == '1');
+            position.set(Position.PREFIX_IN + 2, io.charAt(2) == '1');
+            position.set(Position.PREFIX_IN + 3, io.charAt(3) == '1');
+            position.set(Position.PREFIX_OUT + 1, io.charAt(4) == '1');
+            position.set(Position.PREFIX_OUT + 2, io.charAt(5) == '1');
+        }
 
-        if (type.equals("STT")) {
-            position.set(Position.KEY_INDEX, Integer.parseInt(values[index++]));
+        switch (type) {
+            case "STT":
+                index += 1; // mode
+                position.set(Position.KEY_INDEX, Integer.parseInt(values[index++]));
+                break;
+            case "EMG":
+                position.set(Position.KEY_ALARM, decodeEmergency(Integer.parseInt(values[index++])));
+                break;
+            case "EVT":
+                position.set(Position.KEY_EVENT, Integer.parseInt(values[index++]));
+                break;
+            case "ALT":
+                position.set(Position.KEY_ALARM, decodeAlert(Integer.parseInt(values[index++])));
+                break;
+            default:
+                break;
         }
 
         if (hbm) {
@@ -155,7 +238,35 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
             }
 
             if (index < values.length) {
-                position.set(Position.KEY_BATTERY, Double.parseDouble(values[index]));
+                position.set(Position.KEY_BATTERY, Double.parseDouble(values[index++]));
+            }
+
+            if (index < values.length && values[index++].equals("0")) {
+                position.set(Position.KEY_ARCHIVE, true);
+            }
+
+            if (includeAdc) {
+                position.set(Position.PREFIX_ADC + 1, Double.parseDouble(values[index++]));
+                position.set(Position.PREFIX_ADC + 2, Double.parseDouble(values[index++]));
+                position.set(Position.PREFIX_ADC + 3, Double.parseDouble(values[index++]));
+            }
+
+            if (values.length - index >= 2) {
+                String driverUniqueId = values[index++];
+                if (values[index++].equals("1") && !driverUniqueId.isEmpty()) {
+                    position.set(Position.KEY_DRIVER_UNIQUE_ID, driverUniqueId);
+                }
+            }
+
+            if (includeTemp) {
+                for (int i = 1; i <= 3; i++) {
+                    String temperature = values[index++];
+                    String value = temperature.substring(temperature.indexOf(':') + 1);
+                    if (!value.isEmpty()) {
+                        position.set(Position.PREFIX_TEMP + i, Double.parseDouble(value));
+                    }
+                }
+
             }
 
         }
@@ -163,18 +274,105 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
+    private Position decodeUniversal(
+            Channel channel, SocketAddress remoteAddress, String[] values) throws ParseException {
+        int index = 0;
+
+        String type = values[index++];
+
+        if (!type.equals("STT")) {
+            return null;
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, values[index++]);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        Position position = new Position();
+        position.setProtocol(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+        position.set(Position.KEY_TYPE, type);
+
+        int mask = Integer.parseInt(values[index++], 16);
+
+        if (BitUtil.check(mask, 1)) {
+            index += 1; // model
+        }
+
+        if (BitUtil.check(mask, 2)) {
+            position.set(Position.KEY_VERSION_FW, values[index++]);
+        }
+
+        if (BitUtil.check(mask, 3) && values[index++].equals("0")) {
+            position.set(Position.KEY_ARCHIVE, true);
+        }
+
+        if (BitUtil.check(mask, 4) && BitUtil.check(mask, 5)) {
+            DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHH:mm:ss");
+            dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
+            position.setTime(dateFormat.parse(values[index++] + values[index++]));
+        }
+
+        if (BitUtil.check(mask, 6)) {
+            index += 1; // cell
+        }
+
+        if (BitUtil.check(mask, 7)) {
+            index += 1; // mcc
+        }
+
+        if (BitUtil.check(mask, 8)) {
+            index += 1; // mnc
+        }
+
+        if (BitUtil.check(mask, 9)) {
+            index += 1; // lac
+        }
+
+        if (BitUtil.check(mask, 10)) {
+            position.set(Position.KEY_RSSI, Integer.parseInt(values[index++]));
+        }
+
+        if (BitUtil.check(mask, 11)) {
+            position.setLatitude(Double.parseDouble(values[index++]));
+        }
+
+        if (BitUtil.check(mask, 12)) {
+            position.setLongitude(Double.parseDouble(values[index++]));
+        }
+
+        if (BitUtil.check(mask, 13)) {
+            position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(values[index++])));
+        }
+
+        if (BitUtil.check(mask, 14)) {
+            position.setCourse(Double.parseDouble(values[index++]));
+        }
+
+        if (BitUtil.check(mask, 15)) {
+            position.set(Position.KEY_SATELLITES, Integer.parseInt(values[index++]));
+        }
+
+        if (BitUtil.check(mask, 16)) {
+            position.setValid(values[index++].equals("1"));
+        }
+
+        return position;
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
 
         String[] values = ((String) msg).split(";");
 
-        String protocol = values[0].substring(0, 5);
-
-        if (protocol.equals("ST910")) {
+        if (values[0].length() < 5) {
+            return decodeUniversal(channel, remoteAddress, values);
+        } else if (values[0].equals("ST910")) {
             return decode9(channel, remoteAddress, values);
         } else {
-            return decode23(channel, remoteAddress, protocol, values);
+            return decode235(channel, remoteAddress, values[0].substring(0, 5), values);
         }
     }
 
diff --git a/src/org/traccar/protocol/T55ProtocolDecoder.java b/src/org/traccar/protocol/T55ProtocolDecoder.java
index dee7210b1..6b4ee6ebd 100644
--- a/src/org/traccar/protocol/T55ProtocolDecoder.java
+++ b/src/org/traccar/protocol/T55ProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.socket.DatagramChannel;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.Context;
 import org.traccar.DeviceSession;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
@@ -98,8 +99,11 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
     private Position decodeGprmc(
             DeviceSession deviceSession, String sentence, SocketAddress remoteAddress, Channel channel) {
 
-        if (channel != null && !(channel instanceof DatagramChannel)) {
-            channel.write("OK1\r\n");
+        if (deviceSession != null && channel != null && !(channel instanceof DatagramChannel)) {
+            if (Context.getIdentityManager().lookupAttributeBoolean(
+                    deviceSession.getDeviceId(), getProtocolName() + ".ack", false, true)) {
+                channel.write("OK1\r\n");
+            }
         }
 
         Parser parser = new Parser(PATTERN_GPRMC, sentence);
diff --git a/src/org/traccar/protocol/TaipProtocolDecoder.java b/src/org/traccar/protocol/TaipProtocolDecoder.java
index 7702a89fb..e7117a5c9 100644
--- a/src/org/traccar/protocol/TaipProtocolDecoder.java
+++ b/src/org/traccar/protocol/TaipProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.DeviceSession;
+import org.traccar.helper.BitUtil;
 import org.traccar.helper.Checksum;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.DateUtil;
@@ -67,7 +68,6 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
             .number("(x{8})")                    // odometer
             .number("[01]")                      // gps power
             .groupEnd("?")
-            .number("(d)")                       // fix mode
             .any()
             .compile();
 
@@ -104,15 +104,38 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
         Position position = new Position();
         position.setProtocol(getProtocolName());
 
+        Integer event = null;
+
         if (parser.hasNext(3)) {
-            position.set(Position.KEY_EVENT, parser.nextInt(0));
+            event = parser.nextInt();
             position.setTime(getTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0)));
         } else if (parser.hasNext()) {
             position.setTime(getTime(parser.nextInt(0)));
         }
 
         if (parser.hasNext()) {
-            position.set(Position.KEY_EVENT, parser.nextInt(0));
+            event = parser.nextInt();
+        }
+
+        if (event != null) {
+            switch (event) {
+                case 22:
+                    position.set(Position.KEY_ALARM, Position.ALARM_ACCELERATION);
+                    break;
+                case 23:
+                    position.set(Position.KEY_ALARM, Position.ALARM_BRAKING);
+                    break;
+                case 24:
+                    position.set(Position.KEY_ALARM, Position.ALARM_ACCIDENT);
+                    break;
+                case 26:
+                case 28:
+                    position.set(Position.KEY_ALARM, Position.ALARM_CORNERING);
+                    break;
+                default:
+                    position.set(Position.KEY_EVENT, event);
+                    break;
+            }
         }
 
         if (parser.hasNext(6)) {
@@ -138,7 +161,7 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_ODOMETER, parser.nextLong(16, 0));
         }
 
-        position.setValid(parser.nextInt(0) != 0);
+        position.setValid(true);
 
         String[] attributes = null;
         beginIndex = sentence.indexOf(';');
@@ -150,6 +173,12 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
             attributes = sentence.substring(beginIndex, endIndex).split(";");
         }
 
+        return decodeAttributes(channel, remoteAddress, position, attributes);
+    }
+
+    private Position decodeAttributes(
+            Channel channel, SocketAddress remoteAddress, Position position, String[] attributes) {
+
         String uniqueId = null;
         DeviceSession deviceSession = null;
         String messageIndex = null;
@@ -161,7 +190,6 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
                     String key = attribute.substring(0, index).toLowerCase();
                     String value = attribute.substring(index + 1);
                     switch (key) {
-
                         case "id":
                             uniqueId = value;
                             deviceSession = getDeviceSession(channel, remoteAddress, value);
@@ -169,23 +197,30 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
                                 position.setDeviceId(deviceSession.getDeviceId());
                             }
                             break;
-
+                        case "io":
+                            position.set(Position.KEY_IGNITION, BitUtil.check(value.charAt(0) - '0', 0));
+                            position.set(Position.KEY_CHARGE, BitUtil.check(value.charAt(0) - '0', 1));
+                            position.set(Position.KEY_OUTPUT, value.charAt(1) - '0');
+                            position.set(Position.KEY_INPUT, value.charAt(2) - '0');
+                            break;
+                        case "ix":
+                            position.set(Position.PREFIX_IO + 1, value);
+                            break;
+                        case "ad":
+                            position.set(Position.PREFIX_ADC + 1, Integer.parseInt(value));
+                            break;
                         case "sv":
                             position.set(Position.KEY_SATELLITES, Integer.parseInt(value));
                             break;
-
                         case "bl":
-                            position.set(Position.KEY_BATTERY, Integer.parseInt(value));
+                            position.set(Position.KEY_BATTERY, Integer.parseInt(value) * 0.001);
                             break;
-
                         case "vo":
                             position.set(Position.KEY_ODOMETER, Long.parseLong(value));
                             break;
-
                         default:
                             position.set(key, value);
                             break;
-
                     }
                 } else if (attribute.startsWith("#")) {
                     messageIndex = attribute;
diff --git a/src/org/traccar/protocol/TelicProtocolDecoder.java b/src/org/traccar/protocol/TelicProtocolDecoder.java
index 62b756ab5..2c0d714c6 100644
--- a/src/org/traccar/protocol/TelicProtocolDecoder.java
+++ b/src/org/traccar/protocol/TelicProtocolDecoder.java
@@ -34,8 +34,8 @@ public class TelicProtocolDecoder extends BaseProtocolDecoder {
 
     private static final Pattern PATTERN = new PatternBuilder()
             .number("dddd")
-            .number("(d{6})")                    // device id
-            .number("(d+),")                     // type
+            .number("(d{6}|d{15})")              // device id
+            .number("(d{1,2}),")                 // type
             .number("d{12},")                    // event time
             .number("d+,")
             .number("(dd)(dd)(dd)")              // date (ddmmyy)
diff --git a/src/org/traccar/protocol/TeltonikaProtocol.java b/src/org/traccar/protocol/TeltonikaProtocol.java
index 524e6d5b5..d0177da97 100644
--- a/src/org/traccar/protocol/TeltonikaProtocol.java
+++ b/src/org/traccar/protocol/TeltonikaProtocol.java
@@ -39,14 +39,14 @@ public class TeltonikaProtocol extends BaseProtocol {
             protected void addSpecificHandlers(ChannelPipeline pipeline) {
                 pipeline.addLast("frameDecoder", new TeltonikaFrameDecoder());
                 pipeline.addLast("objectEncoder", new TeltonikaProtocolEncoder());
-                pipeline.addLast("objectDecoder", new TeltonikaProtocolDecoder(TeltonikaProtocol.this));
+                pipeline.addLast("objectDecoder", new TeltonikaProtocolDecoder(TeltonikaProtocol.this, false));
             }
         });
         serverList.add(new TrackerServer(new ConnectionlessBootstrap(), getName()) {
             @Override
             protected void addSpecificHandlers(ChannelPipeline pipeline) {
                 pipeline.addLast("objectEncoder", new TeltonikaProtocolEncoder());
-                pipeline.addLast("objectDecoder", new TeltonikaProtocolDecoder(TeltonikaProtocol.this));
+                pipeline.addLast("objectDecoder", new TeltonikaProtocolDecoder(TeltonikaProtocol.this, true));
             }
         });
     }
diff --git a/src/org/traccar/protocol/TeltonikaProtocolDecoder.java b/src/org/traccar/protocol/TeltonikaProtocolDecoder.java
index 3f5b68f67..80f0045d5 100644
--- a/src/org/traccar/protocol/TeltonikaProtocolDecoder.java
+++ b/src/org/traccar/protocol/TeltonikaProtocolDecoder.java
@@ -18,8 +18,8 @@ package org.traccar.protocol;
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.buffer.ChannelBuffers;
 import org.jboss.netty.channel.Channel;
-import org.jboss.netty.channel.socket.DatagramChannel;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.Context;
 import org.traccar.DeviceSession;
 import org.traccar.helper.BitUtil;
 import org.traccar.helper.UnitsConverter;
@@ -35,8 +35,17 @@ import java.util.List;
 
 public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
 
-    public TeltonikaProtocolDecoder(TeltonikaProtocol protocol) {
+    private boolean connectionless;
+    private boolean extended;
+
+    public void setExtended(boolean extended) {
+        this.extended = extended;
+    }
+
+    public TeltonikaProtocolDecoder(TeltonikaProtocol protocol, boolean connectionless) {
         super(protocol);
+        this.connectionless = connectionless;
+        this.extended = Context.getConfig().getBoolean(getProtocolName() + ".extended");
     }
 
     private DeviceSession parseIdentification(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) {
@@ -67,7 +76,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
 
         position.set(Position.KEY_TYPE, buf.readUnsignedByte());
 
-        position.set(Position.KEY_COMMAND, buf.readBytes(buf.readInt()).toString(StandardCharsets.US_ASCII));
+        position.set(Position.KEY_RESULT, buf.readBytes(buf.readInt()).toString(StandardCharsets.US_ASCII));
 
     }
 
@@ -84,7 +93,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
-    private void decodeParameter(Position position, int id, ChannelBuffer buf, int length) {
+    private void decodeOtherParameter(Position position, int id, ChannelBuffer buf, int length) {
         switch (id) {
             case 1:
             case 2:
@@ -95,15 +104,24 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
             case 9:
                 position.set(Position.PREFIX_ADC + 1, readValue(buf, length, false));
                 break;
+            case 17:
+                position.set("axisX", readValue(buf, length, true));
+                break;
+            case 18:
+                position.set("axisY", readValue(buf, length, true));
+                break;
+            case 19:
+                position.set("axisZ", readValue(buf, length, true));
+                break;
+            case 21:
+                position.set(Position.KEY_RSSI, readValue(buf, length, false));
+                break;
             case 66:
                 position.set(Position.KEY_POWER, readValue(buf, length, false) * 0.001);
                 break;
             case 67:
                 position.set(Position.KEY_BATTERY, readValue(buf, length, false) * 0.001);
                 break;
-            case 70:
-                position.set(Position.KEY_DEVICE_TEMP, readValue(buf, length, true) * 0.1);
-                break;
             case 72:
                 position.set(Position.PREFIX_TEMP + 1, readValue(buf, length, true) * 0.1);
                 break;
@@ -114,17 +132,102 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
                 position.set(Position.PREFIX_TEMP + 3, readValue(buf, length, true) * 0.1);
                 break;
             case 78:
-                position.set(Position.KEY_RFID, readValue(buf, length, false));
+                position.set(Position.KEY_DRIVER_UNIQUE_ID, String.format("%016X", readValue(buf, length, false)));
+                break;
+            case 80:
+                position.set("workMode", readValue(buf, length, false));
+                break;
+            case 179:
+                position.set(Position.PREFIX_OUT + 1, readValue(buf, length, false) == 1);
+                break;
+            case 180:
+                position.set(Position.PREFIX_OUT + 2, readValue(buf, length, false) == 1);
+                break;
+            case 181:
+                position.set(Position.KEY_PDOP, readValue(buf, length, false) * 0.1);
                 break;
             case 182:
                 position.set(Position.KEY_HDOP, readValue(buf, length, false) * 0.1);
                 break;
+            case 239:
+                position.set(Position.KEY_IGNITION, readValue(buf, length, false) == 1);
+                break;
+            case 240:
+                position.set(Position.KEY_MOTION, readValue(buf, length, false) == 1);
+                break;
+            case 241:
+                position.set(Position.KEY_OPERATOR, readValue(buf, length, false));
+                break;
             default:
                 position.set(Position.PREFIX_IO + id, readValue(buf, length, false));
                 break;
         }
     }
 
+    private void decodeGh3000Parameter(Position position, int id, ChannelBuffer buf, int length) {
+        switch (id) {
+            case 1:
+                position.set(Position.KEY_BATTERY_LEVEL, readValue(buf, length, false));
+                break;
+            case 2:
+                position.set("usbConnected", readValue(buf, length, false) == 1);
+                break;
+            case 5:
+                position.set("uptime", readValue(buf, length, false));
+                break;
+            case 20:
+                position.set(Position.KEY_HDOP, readValue(buf, length, false) * 0.1);
+                break;
+            case 21:
+                position.set(Position.KEY_VDOP, readValue(buf, length, false) * 0.1);
+                break;
+            case 22:
+                position.set(Position.KEY_PDOP, readValue(buf, length, false) * 0.1);
+                break;
+            case 67:
+                position.set(Position.KEY_BATTERY, readValue(buf, length, false) * 0.001);
+                break;
+            case 221:
+                position.set("button", readValue(buf, length, false));
+                break;
+            case 222:
+                if (readValue(buf, length, false) == 1) {
+                    position.set(Position.KEY_ALARM, Position.ALARM_SOS);
+                }
+                break;
+            case 240:
+                position.set(Position.KEY_MOTION, readValue(buf, length, false) == 1);
+                break;
+            case 244:
+                position.set(Position.KEY_ROAMING, readValue(buf, length, false) == 1);
+                break;
+            default:
+                position.set(Position.PREFIX_IO + id, readValue(buf, length, false));
+                break;
+        }
+    }
+
+    private void decodeParameter(Position position, int id, ChannelBuffer buf, int length, int codec) {
+        if (codec == CODEC_GH3000) {
+            decodeGh3000Parameter(position, id, buf, length);
+        } else {
+            decodeOtherParameter(position, id, buf, length);
+        }
+    }
+
+    private void decodeNetwork(Position position) {
+        long cid = position.getLong(Position.PREFIX_IO + 205);
+        int lac = position.getInteger(Position.PREFIX_IO + 206);
+        if (cid != 0 && lac != 0) {
+            CellTower cellTower = CellTower.fromLacCid(lac, cid);
+            long operator = position.getInteger(Position.KEY_OPERATOR);
+            if (operator != 0) {
+                cellTower.setOperator(operator);
+            }
+            position.setNetwork(new Network(cellTower));
+        }
+    }
+
     private void decodeLocation(Position position, ChannelBuffer buf, int codec) {
 
         int globalMask = 0x0f;
@@ -171,14 +274,19 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
                         cellTower.setSignalStrength((int) buf.readUnsignedByte());
                     }
 
-                    position.setNetwork(new Network(cellTower));
+                    if (BitUtil.check(locationMask, 7)) {
+                        cellTower.setOperator(buf.readUnsignedInt());
+                    }
 
-                } else if (BitUtil.check(locationMask, 6)) {
-                    position.set(Position.KEY_RSSI, buf.readUnsignedByte());
-                }
+                    position.setNetwork(new Network(cellTower));
 
-                if (BitUtil.check(locationMask, 7)) {
-                    position.set(Position.KEY_OPERATOR, buf.readUnsignedInt());
+                } else {
+                    if (BitUtil.check(locationMask, 6)) {
+                        position.set(Position.KEY_RSSI, buf.readUnsignedByte());
+                    }
+                    if (BitUtil.check(locationMask, 7)) {
+                        position.set(Position.KEY_OPERATOR, buf.readUnsignedInt());
+                    }
                 }
 
             } else {
@@ -215,7 +323,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         if (BitUtil.check(globalMask, 1)) {
             int cnt = buf.readUnsignedByte();
             for (int j = 0; j < cnt; j++) {
-                decodeParameter(position, buf.readUnsignedByte(), buf, 1);
+                decodeParameter(position, buf.readUnsignedByte(), buf, 1, codec);
             }
         }
 
@@ -223,7 +331,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         if (BitUtil.check(globalMask, 2)) {
             int cnt = buf.readUnsignedByte();
             for (int j = 0; j < cnt; j++) {
-                decodeParameter(position, buf.readUnsignedByte(), buf, 2);
+                decodeParameter(position, buf.readUnsignedByte(), buf, 2, codec);
             }
         }
 
@@ -231,7 +339,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         if (BitUtil.check(globalMask, 3)) {
             int cnt = buf.readUnsignedByte();
             for (int j = 0; j < cnt; j++) {
-                decodeParameter(position, buf.readUnsignedByte(), buf, 4);
+                decodeParameter(position, buf.readUnsignedByte(), buf, 4, codec);
             }
         }
 
@@ -239,17 +347,27 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         if (codec == CODEC_FM4X00) {
             int cnt = buf.readUnsignedByte();
             for (int j = 0; j < cnt; j++) {
-                decodeParameter(position, buf.readUnsignedByte(), buf, 8);
+                decodeOtherParameter(position, buf.readUnsignedByte(), buf, 8);
             }
         }
 
+        // Read 16 byte data
+        if (extended) {
+            int cnt = buf.readUnsignedByte();
+            for (int j = 0; j < cnt; j++) {
+                position.set(Position.PREFIX_IO + buf.readUnsignedByte(), ChannelBuffers.hexDump(buf.readBytes(16)));
+            }
+        }
+
+        decodeNetwork(position);
+
     }
 
     private List<Position> parseData(
             Channel channel, SocketAddress remoteAddress, ChannelBuffer buf, int locationPacketId, String... imei) {
         List<Position> positions = new LinkedList<>();
 
-        if (!(channel instanceof DatagramChannel)) {
+        if (!connectionless) {
             buf.readUnsignedInt(); // data length
         }
 
@@ -278,7 +396,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (channel != null) {
-            if (channel instanceof DatagramChannel) {
+            if (connectionless) {
                 ChannelBuffer response = ChannelBuffers.dynamicBuffer();
                 response.writeShort(5);
                 response.writeShort(0);
@@ -301,7 +419,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
 
         ChannelBuffer buf = (ChannelBuffer) msg;
 
-        if (channel instanceof DatagramChannel) {
+        if (connectionless) {
             return decodeUdp(channel, remoteAddress, buf);
         } else {
             return decodeTcp(channel, remoteAddress, buf);
diff --git a/src/org/traccar/protocol/Tk103ProtocolDecoder.java b/src/org/traccar/protocol/Tk103ProtocolDecoder.java
index 4c7da12e0..be3def453 100644
--- a/src/org/traccar/protocol/Tk103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tk103ProtocolDecoder.java
@@ -23,7 +23,6 @@ import org.traccar.helper.BitUtil;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
 import org.traccar.helper.PatternBuilder;
-import org.traccar.helper.UnitsConverter;
 import org.traccar.model.CellTower;
 import org.traccar.model.Network;
 import org.traccar.model.Position;
@@ -33,8 +32,11 @@ import java.util.regex.Pattern;
 
 public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
 
+    private boolean decodeLow;
+
     public Tk103ProtocolDecoder(Tk103Protocol protocol) {
         super(protocol);
+        decodeLow = Context.getConfig().getBoolean(getProtocolName() + ".decodeLow");
     }
 
     private static final Pattern PATTERN = new PatternBuilder()
@@ -50,7 +52,14 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
             .number("(d+.d)(?:d*,)?")            // speed
             .number("(dd)(dd)(dd),?")            // time (hhmmss)
             .number("(d+.?d{1,2}),?")            // course
-            .number("(?:([01]{8})|(x{8}))?,?")   // state
+            .groupBegin()
+            .number("([01])")                    // charge
+            .number("([01])")                    // ignition
+            .number("(x)")                       // io
+            .number("(x)")                       // io
+            .number("(x)")                       // io
+            .number("(xxx),?")                   // fuel
+            .groupEnd("?")
             .number("(?:L(x+))?")                // odometer
             .any()
             .number("([+-]ddd.d)?")              // temperature
@@ -200,17 +209,11 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
         if (channel != null) {
             String id = sentence.substring(0, 12);
             String type = sentence.substring(12, 16);
-            if (type.equals("BP00") || type.equals("BP05")) {
-                String content = sentence.substring(16);
-                if (content.length() >= 15) {
-                    getDeviceSession(channel, remoteAddress, content.substring(0, 15));
-                }
-                if (type.equals("BP00")) {
-                    channel.write("(" + id + "AP01HSO)");
-                    return null;
-                } else if (type.equals("BP05")) {
-                    channel.write("(" + id + "AP05)");
-                }
+            if (type.equals("BP00")) {
+                channel.write("(" + id + "AP01HSO)");
+                return null;
+            } else if (type.equals("BP05")) {
+                channel.write("(" + id + "AP05)");
             }
         }
 
@@ -249,32 +252,44 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
         position.setLatitude(parser.nextCoordinate());
         position.setLongitude(parser.nextCoordinate());
 
-        switch (Context.getConfig().getString(getProtocolName() + ".speed", "kmh")) {
-            case "kn":
-                position.setSpeed(parser.nextDouble(0));
-                break;
-            case "mph":
-                position.setSpeed(UnitsConverter.knotsFromMph(parser.nextDouble(0)));
-                break;
-            default:
-                position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
-                break;
-        }
+        position.setSpeed(convertSpeed(parser.nextDouble(0), "kmh"));
 
         dateBuilder.setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
         position.setTime(dateBuilder.getDate());
 
         position.setCourse(parser.nextDouble(0));
 
-        String status = parser.next();
-        if (status != null) {
-            position.set(Position.KEY_STATUS, status); // binary status
+        if (parser.hasNext(6)) {
+            position.set(Position.KEY_CHARGE, parser.nextInt() == 0);
+            position.set(Position.KEY_IGNITION, parser.nextInt() == 1);
+
+            int mask1 = parser.nextHexInt();
+            position.set(Position.PREFIX_IN + 2, BitUtil.check(mask1, 0) ? 1 : 0);
+            position.set("panic", BitUtil.check(mask1, 1) ? 1 : 0);
+            position.set(Position.PREFIX_OUT + 2, BitUtil.check(mask1, 2) ? 1 : 0);
+            if (decodeLow || BitUtil.check(mask1, 3)) {
+                position.set(Position.KEY_BLOCKED, BitUtil.check(mask1, 3) ? 1 : 0);
+            }
+
+            int mask2 = parser.nextHexInt();
+            for (int i = 0; i < 3; i++) {
+                if (decodeLow || BitUtil.check(mask2, i)) {
+                    position.set("hs" + (3 - i), BitUtil.check(mask2, i) ? 1 : 0);
+                }
+            }
+            if (decodeLow || BitUtil.check(mask2, 3)) {
+                position.set(Position.KEY_DOOR, BitUtil.check(mask2, 3) ? 1 : 0);
+            }
+
+            int mask3 = parser.nextHexInt();
+            for (int i = 1; i <= 3; i++) {
+                if (decodeLow || BitUtil.check(mask3, i)) {
+                    position.set("ls" + (3 - i + 1), BitUtil.check(mask3, i) ? 1 : 0);
+                }
+            }
 
-            int value = Integer.parseInt(new StringBuilder(status).reverse().toString(), 2);
-            position.set(Position.KEY_CHARGE, !BitUtil.check(value, 0));
-            position.set(Position.KEY_IGNITION, BitUtil.check(value, 1));
+            position.set(Position.KEY_FUEL_LEVEL, parser.nextHexInt());
         }
-        position.set(Position.KEY_STATUS, parser.next()); // hex status
 
         if (parser.hasNext()) {
             position.set(Position.KEY_ODOMETER, parser.nextLong(16, 0));
diff --git a/src/org/traccar/protocol/TlvProtocol.java b/src/org/traccar/protocol/TlvProtocol.java
new file mode 100644
index 000000000..da8d88b8a
--- /dev/null
+++ b/src/org/traccar/protocol/TlvProtocol.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.bootstrap.ServerBootstrap;
+import org.jboss.netty.channel.ChannelPipeline;
+import org.traccar.BaseProtocol;
+import org.traccar.CharacterDelimiterFrameDecoder;
+import org.traccar.TrackerServer;
+
+import java.util.List;
+
+public class TlvProtocol extends BaseProtocol {
+
+    public TlvProtocol() {
+        super("tlv");
+    }
+
+    @Override
+    public void initTrackerServers(List<TrackerServer> serverList) {
+        serverList.add(new TrackerServer(new ServerBootstrap(), getName()) {
+            @Override
+            protected void addSpecificHandlers(ChannelPipeline pipeline) {
+                pipeline.addLast("frameDecoder", new CharacterDelimiterFrameDecoder('\0'));
+                pipeline.addLast("objectDecoder", new TlvProtocolDecoder(TlvProtocol.this));
+            }
+        });
+    }
+
+}
diff --git a/src/org/traccar/protocol/TlvProtocolDecoder.java b/src/org/traccar/protocol/TlvProtocolDecoder.java
new file mode 100644
index 000000000..41d65be09
--- /dev/null
+++ b/src/org/traccar/protocol/TlvProtocolDecoder.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+public class TlvProtocolDecoder extends BaseProtocolDecoder {
+
+    public TlvProtocolDecoder(TlvProtocol protocol) {
+        super(protocol);
+    }
+
+    private void sendResponse(Channel channel, String type, String... arguments) {
+        if (channel != null) {
+            ChannelBuffer response = ChannelBuffers.dynamicBuffer();
+            response.writeBytes(ChannelBuffers.copiedBuffer(type, StandardCharsets.US_ASCII));
+            for (String argument : arguments) {
+                response.writeByte(argument.length());
+                response.writeBytes(ChannelBuffers.copiedBuffer(argument, StandardCharsets.US_ASCII));
+            }
+            response.writeByte(0);
+            channel.write(response);
+        }
+    }
+
+    private String readArgument(ChannelBuffer buf) {
+        return buf.readBytes(buf.readUnsignedByte()).toString(StandardCharsets.US_ASCII);
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        String type = buf.readBytes(2).toString(StandardCharsets.US_ASCII);
+
+        if (channel != null) {
+            switch (type) {
+                case "0A":
+                case "0C":
+                    sendResponse(channel, type);
+                    break;
+                case "0B":
+                    sendResponse(channel, type, "1482202689", "10", "20", "15");
+                    break;
+                case "0E":
+                case "0F":
+                    sendResponse(channel, type, "30", "Unknown");
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        if (type.equals("0E")) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, readArgument(buf));
+            if (deviceSession == null) {
+                return null;
+            }
+
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setValid(true);
+            position.setTime(new Date(Long.parseLong(readArgument(buf)) * 1000));
+
+            readArgument(buf); // location identifier
+
+            position.setLongitude(Double.parseDouble(readArgument(buf)));
+            position.setLatitude(Double.parseDouble(readArgument(buf)));
+            position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(readArgument(buf))));
+            position.setCourse(Double.parseDouble(readArgument(buf)));
+
+            position.set(Position.KEY_SATELLITES, Integer.parseInt(readArgument(buf)));
+
+            return position;
+
+        }
+
+        return null;
+    }
+
+}
diff --git a/src/org/traccar/protocol/TmgProtocolDecoder.java b/src/org/traccar/protocol/TmgProtocolDecoder.java
index c10523117..b8458dd52 100644
--- a/src/org/traccar/protocol/TmgProtocolDecoder.java
+++ b/src/org/traccar/protocol/TmgProtocolDecoder.java
@@ -144,7 +144,7 @@ public class TmgProtocolDecoder extends BaseProtocolDecoder {
         position.set(Position.PREFIX_ADC + 1, parser.nextDouble(0));
         position.set(Position.PREFIX_ADC + 2, parser.nextDouble(0));
         position.set(Position.KEY_VERSION_FW, parser.next());
-        position.set(Position.KEY_RFID, parser.next());
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
 
         return position;
     }
diff --git a/src/org/traccar/protocol/TotemProtocolDecoder.java b/src/org/traccar/protocol/TotemProtocolDecoder.java
index a4ae4cb8f..3c2dee8ec 100644
--- a/src/org/traccar/protocol/TotemProtocolDecoder.java
+++ b/src/org/traccar/protocol/TotemProtocolDecoder.java
@@ -171,6 +171,8 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
                 return Position.ALARM_LOW_BATTERY;
             case 0x11:
                 return Position.ALARM_OVERSPEED;
+            case 0x30:
+                return Position.ALARM_PARKING;
             case 0x42:
                 return Position.ALARM_GEOFENCE_EXIT;
             case 0x43:
diff --git a/src/org/traccar/protocol/TramigoProtocolDecoder.java b/src/org/traccar/protocol/TramigoProtocolDecoder.java
index b39e3eab1..b1e28e17d 100644
--- a/src/org/traccar/protocol/TramigoProtocolDecoder.java
+++ b/src/org/traccar/protocol/TramigoProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2014 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -130,12 +130,13 @@ public class TramigoProtocolDecoder extends BaseProtocolDecoder {
                 position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(matcher.group(2))));
             }
 
-            pattern = Pattern.compile("(\\d{1,2}:\\d{2} \\w{3} \\d{1,2})");
+            pattern = Pattern.compile("(\\d{1,2}:\\d{2}(:\\d{2})? \\w{3} \\d{1,2})");
             matcher = pattern.matcher(sentence);
             if (!matcher.find()) {
                 return null;
             }
-            DateFormat dateFormat = new SimpleDateFormat("HH:mm MMM d yyyy", Locale.ENGLISH);
+            DateFormat dateFormat = new SimpleDateFormat(
+                    matcher.group(2) != null ? "HH:mm:ss MMM d yyyy" : "HH:mm MMM d yyyy", Locale.ENGLISH);
             position.setTime(DateUtil.correctYear(
                     dateFormat.parse(matcher.group(1) + " " + Calendar.getInstance().get(Calendar.YEAR))));
 
diff --git a/src/org/traccar/protocol/TrvProtocolDecoder.java b/src/org/traccar/protocol/TrvProtocolDecoder.java
index 88ac76134..918748f7b 100644
--- a/src/org/traccar/protocol/TrvProtocolDecoder.java
+++ b/src/org/traccar/protocol/TrvProtocolDecoder.java
@@ -53,8 +53,8 @@ public class TrvProtocolDecoder extends BaseProtocolDecoder {
             .number("(ddd)")                     // satellites
             .number("(ddd)")                     // battery
             .number("(d)")                       // acc
-            .number("dd")                        // arm status
-            .number("dd,")                       // working mode
+            .number("(dd)")                      // arm status
+            .number("(dd),")                     // working mode
             .number("(d+),")                     // mcc
             .number("(d+),")                     // mnc
             .number("(d+),")                     // lac
@@ -71,9 +71,41 @@ public class TrvProtocolDecoder extends BaseProtocolDecoder {
             .number("(d)")                       // acc
             .number("(dd)")                      // arm status
             .number("(dd)")                      // working mode
+            .groupBegin()
+            .number("(ddd)")                     // interval
+            .number("d")                         // vibration alarm
+            .number("ddd")                       // vibration sensitivity
+            .number("d")                         // automatic arm
+            .number("dddd")                      // automatic arm time
+            .number("(d)")                       // blocked
+            .number("(d)")                       // power status
+            .number("(d)")                       // movement status
+            .groupEnd("?")
             .any()
             .compile();
 
+    private Boolean decodeOptionalValue(Parser parser, int activeValue) {
+        int value = parser.nextInt();
+        if (value != 0) {
+            return value == activeValue;
+        }
+        return null;
+    }
+
+    private void decodeCommon(Position position, Parser parser) {
+
+        position.set(Position.KEY_RSSI, parser.nextInt());
+        position.set(Position.KEY_SATELLITES, parser.nextInt());
+        position.set(Position.KEY_BATTERY, parser.nextInt());
+        position.set(Position.KEY_IGNITION, decodeOptionalValue(parser, 1));
+        position.set(Position.KEY_ARMED, decodeOptionalValue(parser, 1));
+
+        int mode = parser.nextInt();
+        if (mode != 0) {
+            position.set("mode", mode);
+        }
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
@@ -84,11 +116,14 @@ public class TrvProtocolDecoder extends BaseProtocolDecoder {
         String type = sentence.substring(id.length(), id.length() + 4);
 
         if (channel != null) {
+            String responseHeader = id + (char) (type.charAt(0) + 1) + type.substring(1);
             if (type.equals("AP00") && id.equals("IW")) {
                 String time = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
-                channel.write(id + (char) (type.charAt(0) + 1) + type.substring(1) + "," + time + ",0#");
+                channel.write(responseHeader + "," + time + ",0#");
+            } else if (type.equals("AP14")) {
+                channel.write(responseHeader + ",0.000,0.000#");
             } else {
-                channel.write(id + (char) (type.charAt(0) + 1) + type.substring(1) + "#");
+                channel.write(responseHeader + "#");
             }
         }
 
@@ -115,13 +150,13 @@ public class TrvProtocolDecoder extends BaseProtocolDecoder {
 
             getLastLocation(position, null);
 
-            position.set(Position.KEY_RSSI, parser.nextInt(0));
-            position.set(Position.KEY_SATELLITES, parser.nextInt(0));
-            position.set(Position.KEY_BATTERY, parser.nextInt(0));
-            position.set(Position.KEY_IGNITION, parser.nextInt(0) != 0);
+            decodeCommon(position, parser);
 
-            position.set("arm", parser.nextInt(0));
-            position.set("mode", parser.nextInt(0));
+            if (parser.hasNext(3)) {
+                position.set(Position.KEY_BLOCKED, decodeOptionalValue(parser, 2));
+                position.set(Position.KEY_CHARGE, decodeOptionalValue(parser, 1));
+                position.set(Position.KEY_MOTION, decodeOptionalValue(parser, 1));
+            }
 
             return position;
 
@@ -137,31 +172,25 @@ public class TrvProtocolDecoder extends BaseProtocolDecoder {
             position.setDeviceId(deviceSession.getDeviceId());
 
             DateBuilder dateBuilder = new DateBuilder()
-                    .setDate(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
+                    .setDate(parser.nextInt(), parser.nextInt(), parser.nextInt());
 
             position.setValid(parser.next().equals("A"));
             position.setLatitude(parser.nextCoordinate());
             position.setLongitude(parser.nextCoordinate());
-            position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
+            position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble()));
 
-            dateBuilder.setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
+            dateBuilder.setTime(parser.nextInt(), parser.nextInt(), parser.nextInt());
             position.setTime(dateBuilder.getDate());
 
-            position.setCourse(parser.nextDouble(0));
+            position.setCourse(parser.nextDouble());
 
-            int rssi = parser.nextInt(0);
-            position.set(Position.KEY_SATELLITES, parser.nextInt(0));
-            position.set(Position.KEY_BATTERY, parser.nextInt(0));
-
-            int acc = parser.nextInt(0);
-            if (acc != 0) {
-                position.set(Position.KEY_IGNITION, acc == 1);
-            }
+            decodeCommon(position, parser);
 
             position.setNetwork(new Network(CellTower.from(
-                    parser.nextInt(0), parser.nextInt(0), parser.nextInt(0), parser.nextInt(0), rssi)));
+                    parser.nextInt(), parser.nextInt(), parser.nextInt(), parser.nextInt())));
 
             return position;
+
         }
 
         return null;
diff --git a/src/org/traccar/protocol/TytanProtocolDecoder.java b/src/org/traccar/protocol/TytanProtocolDecoder.java
index 030fbce78..0ae669784 100644
--- a/src/org/traccar/protocol/TytanProtocolDecoder.java
+++ b/src/org/traccar/protocol/TytanProtocolDecoder.java
@@ -111,7 +111,7 @@ public class TytanProtocolDecoder extends BaseProtocolDecoder {
                     position.set(Position.KEY_OBD_ODOMETER, buf.readUnsignedInt() * 5);
                     break;
                 case 150:
-                    position.set("door", buf.readUnsignedByte());
+                    position.set(Position.KEY_DOOR, buf.readUnsignedByte());
                     break;
                 default:
                     buf.skipBytes(length);
diff --git a/src/org/traccar/protocol/TzoneProtocolDecoder.java b/src/org/traccar/protocol/TzoneProtocolDecoder.java
index 69aa916df..079ad3126 100644
--- a/src/org/traccar/protocol/TzoneProtocolDecoder.java
+++ b/src/org/traccar/protocol/TzoneProtocolDecoder.java
@@ -43,7 +43,7 @@ public class TzoneProtocolDecoder extends BaseProtocolDecoder {
             case 0x11:
                 return Position.ALARM_OVERSPEED;
             case 0x14:
-                return Position.ALARM_BREAKING;
+                return Position.ALARM_BRAKING;
             case 0x15:
                 return Position.ALARM_ACCELERATION;
             case 0x30:
@@ -203,7 +203,16 @@ public class TzoneProtocolDecoder extends BaseProtocolDecoder {
         if (blockLength >= 13) {
             position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
             position.set("terminalInfo", buf.readUnsignedByte());
-            position.set(Position.PREFIX_IO + 1, buf.readUnsignedShort());
+
+            int status = buf.readUnsignedByte();
+            position.set(Position.PREFIX_OUT + 1, BitUtil.check(status, 0));
+            position.set(Position.PREFIX_OUT + 2, BitUtil.check(status, 1));
+            status = buf.readUnsignedByte();
+            position.set(Position.PREFIX_IN + 1, BitUtil.check(status, 4));
+            if (BitUtil.check(status, 0)) {
+                position.set(Position.KEY_ALARM, Position.ALARM_SOS);
+            }
+
             position.set(Position.KEY_RSSI, buf.readUnsignedByte());
             position.set("gsmStatus", buf.readUnsignedByte());
             position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
diff --git a/src/org/traccar/protocol/UlbotechProtocolDecoder.java b/src/org/traccar/protocol/UlbotechProtocolDecoder.java
index 1b22eeb75..31a3d2cfe 100644
--- a/src/org/traccar/protocol/UlbotechProtocolDecoder.java
+++ b/src/org/traccar/protocol/UlbotechProtocolDecoder.java
@@ -308,7 +308,8 @@ public class UlbotechProtocolDecoder extends BaseProtocolDecoder {
                     break;
 
                 case DATA_RFID:
-                    position.set(Position.KEY_RFID, buf.readBytes(length - 1).toString(StandardCharsets.US_ASCII));
+                    position.set(Position.KEY_DRIVER_UNIQUE_ID,
+                            buf.readBytes(length - 1).toString(StandardCharsets.US_ASCII));
                     position.set("authorized", buf.readUnsignedByte() != 0);
                     break;
 
diff --git a/src/org/traccar/protocol/VisiontekProtocolDecoder.java b/src/org/traccar/protocol/VisiontekProtocolDecoder.java
index 636a3d640..f32c9fbfe 100644
--- a/src/org/traccar/protocol/VisiontekProtocolDecoder.java
+++ b/src/org/traccar/protocol/VisiontekProtocolDecoder.java
@@ -130,7 +130,7 @@ public class VisiontekProtocolDecoder extends BaseProtocolDecoder {
 
         position.setValid(parser.next().equals("A"));
 
-        position.set(Position.KEY_RFID, parser.next());
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
 
         return position;
     }
diff --git a/src/org/traccar/protocol/Vt200ProtocolDecoder.java b/src/org/traccar/protocol/Vt200ProtocolDecoder.java
index b9af11b43..2ae24efbb 100644
--- a/src/org/traccar/protocol/Vt200ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Vt200ProtocolDecoder.java
@@ -27,6 +27,8 @@ import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Position;
 
 import java.net.SocketAddress;
+import java.util.Arrays;
+import java.util.Date;
 
 public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
 
@@ -40,6 +42,13 @@ public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
         return degrees + minutes * 0.0001 / 60;
     }
 
+    protected Date decodeDate(ChannelBuffer buf) {
+        DateBuilder dateBuilder = new DateBuilder()
+                .setDateReverse(BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2))
+                .setTime(BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
+        return dateBuilder.getDate();
+    }
+
     @Override
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
@@ -57,7 +66,7 @@ public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
         int type = buf.readUnsignedShort();
         buf.readUnsignedShort(); // length
 
-        if (type == 0x2084) {
+        if (type == 0x2086 || type == 0x2084 || type == 0x2082) {
 
             Position position = new Position();
             position.setProtocol(getProtocolName());
@@ -66,12 +75,7 @@ public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
             buf.readUnsignedByte(); // data type
             buf.readUnsignedShort(); // trip id
 
-            DateBuilder dateBuilder = new DateBuilder();
-            dateBuilder.setDateReverse(
-                    BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
-            dateBuilder.setTime(
-                    BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
-            position.setTime(dateBuilder.getDate());
+            position.setTime(decodeDate(buf));
 
             position.setLatitude(decodeCoordinate(BcdUtil.readInteger(buf, 8)));
             position.setLongitude(decodeCoordinate(BcdUtil.readInteger(buf, 9)));
@@ -97,6 +101,48 @@ public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
 
             return position;
 
+        } else if (type == 0x3088) {
+
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            getLastLocation(position, null);
+
+            buf.readUnsignedShort(); // trip id
+            buf.skipBytes(8); // imei
+            buf.skipBytes(8); // imsi
+
+            position.set("tripStart", decodeDate(buf).getTime());
+            position.set("tripEnd", decodeDate(buf).getTime());
+            position.set("drivingTime", buf.readUnsignedShort());
+
+            position.set(Position.KEY_FUEL_CONSUMPTION, buf.readUnsignedInt());
+            position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt());
+
+            position.set("maxSpeed", UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+            position.set("maxRpm", buf.readUnsignedShort());
+            position.set("maxTemp", buf.readUnsignedByte() - 40);
+            position.set("hardAccelerationCount", buf.readUnsignedByte());
+            position.set("hardBrakingCount", buf.readUnsignedByte());
+
+            for (String speedType : Arrays.asList("over", "high", "normal", "low")) {
+                position.set(speedType + "SpeedTime", buf.readUnsignedShort());
+                position.set(speedType + "SpeedDistance", buf.readUnsignedInt());
+                position.set(speedType + "SpeedFuel", buf.readUnsignedInt());
+            }
+
+            position.set("idleTime", buf.readUnsignedShort());
+            position.set("idleFuel", buf.readUnsignedInt());
+
+            position.set("hardCorneringCount", buf.readUnsignedByte());
+            position.set("overspeedCount", buf.readUnsignedByte());
+            position.set("overheatCount", buf.readUnsignedShort());
+            position.set("laneChangeCount", buf.readUnsignedByte());
+            position.set("emergencyRefueling", buf.readUnsignedByte());
+
+            return position;
+
         }
 
         return null;
diff --git a/src/org/traccar/protocol/VtfmsProtocolDecoder.java b/src/org/traccar/protocol/VtfmsProtocolDecoder.java
index 852b9a749..5fb687e6d 100644
--- a/src/org/traccar/protocol/VtfmsProtocolDecoder.java
+++ b/src/org/traccar/protocol/VtfmsProtocolDecoder.java
@@ -84,7 +84,7 @@ public class VtfmsProtocolDecoder extends BaseProtocolDecoder {
             case 15:
                 return Position.ALARM_POWER_RESTORED;
             case 32:
-                return Position.ALARM_BREAKING;
+                return Position.ALARM_BRAKING;
             case 33:
                 return Position.ALARM_ACCELERATION;
             default:
diff --git a/src/org/traccar/protocol/WatchProtocol.java b/src/org/traccar/protocol/WatchProtocol.java
index 42a640b85..2be2dc9ae 100644
--- a/src/org/traccar/protocol/WatchProtocol.java
+++ b/src/org/traccar/protocol/WatchProtocol.java
@@ -29,6 +29,7 @@ public class WatchProtocol extends BaseProtocol {
     public WatchProtocol() {
         super("watch");
         setSupportedDataCommands(
+                Command.TYPE_CUSTOM,
                 Command.TYPE_POSITION_SINGLE,
                 Command.TYPE_POSITION_PERIODIC,
                 Command.TYPE_SOS_NUMBER,
diff --git a/src/org/traccar/protocol/WatchProtocolDecoder.java b/src/org/traccar/protocol/WatchProtocolDecoder.java
index 57f5d7e78..86dc9456d 100644
--- a/src/org/traccar/protocol/WatchProtocolDecoder.java
+++ b/src/org/traccar/protocol/WatchProtocolDecoder.java
@@ -76,8 +76,6 @@ public class WatchProtocolDecoder extends BaseProtocolDecoder {
             return Position.ALARM_GEOFENCE_ENTER;
         } else if (BitUtil.check(status, 3)) {
             return Position.ALARM_OVERSPEED;
-        } else if (BitUtil.check(status, 4)) {
-            return Position.ALARM_MOVEMENT;
         } else if (BitUtil.check(status, 16)) {
             return Position.ALARM_SOS;
         } else if (BitUtil.check(status, 17)) {
@@ -207,9 +205,13 @@ public class WatchProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_RSSI, parser.nextInt(0));
             position.set(Position.KEY_BATTERY_LEVEL, parser.nextInt(0));
 
-            position.set("steps", parser.nextInt(0));
+            position.set(Position.KEY_STEPS, parser.nextInt(0));
 
-            position.set(Position.KEY_ALARM, decodeAlarm(parser.nextHexInt(0)));
+            int status = parser.nextHexInt(0);
+            position.set(Position.KEY_ALARM, decodeAlarm(status));
+            if (BitUtil.check(status, 4)) {
+                position.set(Position.KEY_MOTION, true);
+            }
 
             decodeTail(position, parser.next());
 
diff --git a/src/org/traccar/protocol/WatchProtocolEncoder.java b/src/org/traccar/protocol/WatchProtocolEncoder.java
index c5d8fad86..d2d3b52d1 100644
--- a/src/org/traccar/protocol/WatchProtocolEncoder.java
+++ b/src/org/traccar/protocol/WatchProtocolEncoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,13 +26,14 @@ import java.text.DecimalFormatSymbols;
 import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
+import java.util.TimeZone;
 
 public class WatchProtocolEncoder extends StringProtocolEncoder implements StringProtocolEncoder.ValueFormatter {
 
     @Override
     public String formatValue(String key, Object value) {
         if (key.equals(Command.KEY_TIMEZONE)) {
-            double offset = ((Number) value).longValue() / 3600.0;
+            double offset = TimeZone.getTimeZone((String) value).getRawOffset() / 3600000.0;
             DecimalFormat fmt = new DecimalFormat("+#.##;-#.##", DecimalFormatSymbols.getInstance(Locale.US));
             return fmt.format(offset);
         }
@@ -41,8 +42,9 @@ public class WatchProtocolEncoder extends StringProtocolEncoder implements Strin
     }
 
 
+    @Override
     protected String formatCommand(Command command, String format, String... keys) {
-        String content = super.formatCommand(command, format, this, keys);
+        String content = formatCommand(command, format, this, keys);
         return String.format("[CS*%s*%04x*%s]",
                 getUniqueId(command.getDeviceId()), content.length(), content);
     }
@@ -97,6 +99,8 @@ public class WatchProtocolEncoder extends StringProtocolEncoder implements Strin
     protected Object encodeCommand(Command command) {
 
         switch (command.getType()) {
+            case Command.TYPE_CUSTOM:
+                return formatCommand(command, command.getString(Command.KEY_DATA));
             case Command.TYPE_POSITION_SINGLE:
                 return formatCommand(command, "RG");
             case Command.TYPE_SOS_NUMBER:
diff --git a/src/org/traccar/protocol/WialonProtocolDecoder.java b/src/org/traccar/protocol/WialonProtocolDecoder.java
index 82098413b..4eb3b9b8e 100644
--- a/src/org/traccar/protocol/WialonProtocolDecoder.java
+++ b/src/org/traccar/protocol/WialonProtocolDecoder.java
@@ -109,7 +109,7 @@ public class WialonProtocolDecoder extends BaseProtocolDecoder {
             }
         }
 
-        position.set(Position.KEY_RFID, parser.next());
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next());
 
         if (parser.hasNext()) {
             String[] values = parser.next().split(",");
diff --git a/src/org/traccar/protocol/XexunProtocolDecoder.java b/src/org/traccar/protocol/XexunProtocolDecoder.java
index 20804bbb4..bb4b4f48c 100644
--- a/src/org/traccar/protocol/XexunProtocolDecoder.java
+++ b/src/org/traccar/protocol/XexunProtocolDecoder.java
@@ -17,13 +17,11 @@ package org.traccar.protocol;
 
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
-import org.traccar.Context;
 import org.traccar.DeviceSession;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
 import org.traccar.helper.PatternBuilder;
 import org.traccar.model.Position;
-import org.traccar.helper.UnitsConverter;
 
 import java.net.SocketAddress;
 import java.util.regex.Pattern;
@@ -70,9 +68,11 @@ public class XexunProtocolDecoder extends BaseProtocolDecoder {
         if (value != null) {
             switch (value.toLowerCase()) {
                 case "acc on":
+                case "accstart":
                     position.set(Position.KEY_IGNITION, true);
                     break;
                 case "acc off":
+                case "accstop":
                     position.set(Position.KEY_IGNITION, false);
                     break;
                 case "help me!":
@@ -121,14 +121,7 @@ public class XexunProtocolDecoder extends BaseProtocolDecoder {
         position.setLatitude(parser.nextCoordinate());
         position.setLongitude(parser.nextCoordinate());
 
-        switch (Context.getConfig().getString(getProtocolName() + ".speed", "kn")) {
-            case "kmh":
-                position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
-                break;
-            default:
-                position.setSpeed(parser.nextDouble(0));
-                break;
-        }
+        position.setSpeed(convertSpeed(parser.nextDouble(0), "kn"));
 
         position.setCourse(parser.nextDouble(0));
 
diff --git a/src/org/traccar/protocol/Xt2400ProtocolDecoder.java b/src/org/traccar/protocol/Xt2400ProtocolDecoder.java
index a42c6175f..15e8558be 100644
--- a/src/org/traccar/protocol/Xt2400ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Xt2400ProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.traccar.model.Position;
 
 import javax.xml.bind.DatatypeConverter;
 import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
@@ -77,8 +78,6 @@ public class Xt2400ProtocolDecoder extends BaseProtocolDecoder {
         for (int i : l4) {
             TAG_LENGTH_MAP.put(i, 4);
         }
-        TAG_LENGTH_MAP.put(0x65, 17);
-        TAG_LENGTH_MAP.put(0x73, 16);
         TAG_LENGTH_MAP.put(0x95, 24);
     }
 
@@ -163,12 +162,24 @@ public class Xt2400ProtocolDecoder extends BaseProtocolDecoder {
                 case 0x13:
                     position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
                     break;
+                case 0x14:
+                    position.set(Position.KEY_RSSI, buf.readShort());
+                    break;
                 case 0x16:
                     position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 0.1);
                     break;
                 case 0x17:
                     position.set(Position.KEY_POWER, buf.readUnsignedByte() * 0.1);
                     break;
+                case 0x57:
+                    position.set(Position.KEY_OBD_SPEED, UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
+                    break;
+                case 0x65:
+                    position.set(Position.KEY_VIN, buf.readBytes(17).toString(StandardCharsets.US_ASCII));
+                    break;
+                case 0x73:
+                    position.set(Position.KEY_VERSION_FW, buf.readBytes(16).toString(StandardCharsets.US_ASCII).trim());
+                    break;
                 default:
                     buf.skipBytes(getTagLength(tag));
                     break;
diff --git a/src/org/traccar/reports/Events.java b/src/org/traccar/reports/Events.java
index 0706f1382..a13aeeeb4 100644
--- a/src/org/traccar/reports/Events.java
+++ b/src/org/traccar/reports/Events.java
@@ -42,6 +42,7 @@ public final class Events {
 
     public static Collection<Event> getObjects(long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Collection<String> types, Date from, Date to) throws SQLException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<Event> result = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
@@ -50,7 +51,7 @@ public final class Events {
             for (Event event : events) {
                 if (all || types.contains(event.getType())) {
                     long geofenceId = event.getGeofenceId();
-                    if (geofenceId == 0 || Context.getGeofenceManager().checkGeofence(userId, geofenceId)) {
+                    if (geofenceId == 0 || Context.getGeofenceManager().checkItemPermission(userId, geofenceId)) {
                        result.add(event);
                     }
                 }
@@ -62,6 +63,7 @@ public final class Events {
     public static void getExcel(OutputStream outputStream,
             long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Collection<String> types, Date from, Date to) throws SQLException, IOException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<DeviceReport> devicesEvents = new ArrayList<>();
         ArrayList<String> sheetNames = new ArrayList<>();
         HashMap<Long, String> geofenceNames = new HashMap<>();
@@ -74,8 +76,8 @@ public final class Events {
                 if (all || types.contains(event.getType())) {
                     long geofenceId = event.getGeofenceId();
                     if (geofenceId != 0) {
-                        if (Context.getGeofenceManager().checkGeofence(userId, geofenceId)) {
-                            Geofence geofence = Context.getGeofenceManager().getGeofence(geofenceId);
+                        if (Context.getGeofenceManager().checkItemPermission(userId, geofenceId)) {
+                            Geofence geofence = (Geofence) Context.getGeofenceManager().getById(geofenceId);
                             if (geofence != null) {
                                 geofenceNames.put(geofenceId, geofence.getName());
                             }
@@ -88,11 +90,11 @@ public final class Events {
                 }
             }
             DeviceReport deviceEvents = new DeviceReport();
-            Device device = Context.getIdentityManager().getDeviceById(deviceId);
+            Device device = Context.getIdentityManager().getById(deviceId);
             deviceEvents.setDeviceName(device.getName());
             sheetNames.add(WorkbookUtil.createSafeSheetName(deviceEvents.getDeviceName()));
             if (device.getGroupId() != 0) {
-                Group group = Context.getDeviceManager().getGroupById(device.getGroupId());
+                Group group = Context.getGroupsManager().getById(device.getGroupId());
                 if (group != null) {
                     deviceEvents.setGroupName(group.getName());
                 }
diff --git a/src/org/traccar/reports/ReportUtils.java b/src/org/traccar/reports/ReportUtils.java
index 71c567c29..f6f386e99 100644
--- a/src/org/traccar/reports/ReportUtils.java
+++ b/src/org/traccar/reports/ReportUtils.java
@@ -26,6 +26,10 @@ import org.jxls.transform.Transformer;
 import org.jxls.transform.poi.PoiTransformer;
 import org.jxls.util.TransformerFactory;
 import org.traccar.Context;
+import org.traccar.events.MotionEventHandler;
+import org.traccar.model.DeviceState;
+import org.traccar.model.Driver;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 import org.traccar.reports.model.BaseReport;
 import org.traccar.reports.model.StopReport;
@@ -39,8 +43,10 @@ import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Date;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.TimeZone;
 
 public final class ReportUtils {
@@ -48,16 +54,27 @@ public final class ReportUtils {
     private ReportUtils() {
     }
 
+    public static void checkPeriodLimit(Date from, Date to) {
+        long limit = Context.getConfig().getLong("report.periodLimit") * 1000;
+        if (limit > 0 && to.getTime() - from.getTime() > limit) {
+            throw new IllegalArgumentException("Time period exceeds the limit");
+        }
+    }
+
     public static String getDistanceUnit(long userId) {
-        return (String) Context.getPermissionsManager().lookupPreference(userId, "distanceUnit", "km");
+        return (String) Context.getPermissionsManager().lookupAttribute(userId, "distanceUnit", "km");
     }
 
     public static String getSpeedUnit(long userId) {
-        return (String) Context.getPermissionsManager().lookupPreference(userId, "speedUnit", "kn");
+        return (String) Context.getPermissionsManager().lookupAttribute(userId, "speedUnit", "kn");
+    }
+
+    public static String getVolumeUnit(long userId) {
+        return (String) Context.getPermissionsManager().lookupAttribute(userId, "volumeUnit", "ltr");
     }
 
     public static TimeZone getTimezone(long userId) {
-        String timezone = (String) Context.getPermissionsManager().lookupPreference(userId, "timezone", null);
+        String timezone = (String) Context.getPermissionsManager().lookupAttribute(userId, "timezone", null);
         return timezone != null ? TimeZone.getTimeZone(timezone) : TimeZone.getDefault();
     }
 
@@ -101,10 +118,30 @@ public final class ReportUtils {
         return 0;
     }
 
+    public static String findDriver(Position firstPosition, Position lastPosition) {
+        if (firstPosition.getAttributes().containsKey(Position.KEY_DRIVER_UNIQUE_ID)) {
+            return firstPosition.getString(Position.KEY_DRIVER_UNIQUE_ID);
+        } else if (lastPosition.getAttributes().containsKey(Position.KEY_DRIVER_UNIQUE_ID)) {
+            return lastPosition.getString(Position.KEY_DRIVER_UNIQUE_ID);
+        }
+        return null;
+    }
+
+    public static String findDriverName(String driverUniqueId) {
+        if (driverUniqueId != null && Context.getDriversManager() != null) {
+            Driver driver = Context.getDriversManager().getDriverByUniqueId(driverUniqueId);
+            if (driver != null) {
+                return driver.getName();
+            }
+        }
+        return null;
+    }
+
     public static org.jxls.common.Context initializeContext(long userId) {
         org.jxls.common.Context jxlsContext = PoiTransformer.createInitialContext();
         jxlsContext.putVar("distanceUnit", getDistanceUnit(userId));
         jxlsContext.putVar("speedUnit", getSpeedUnit(userId));
+        jxlsContext.putVar("volumeUnit", getVolumeUnit(userId));
         jxlsContext.putVar("webUrl", Context.getVelocityEngine().getProperty("web.url"));
         jxlsContext.putVar("dateTool", new DateTool());
         jxlsContext.putVar("numberTool", new NumberTool());
@@ -127,15 +164,6 @@ public final class ReportUtils {
         transformer.write();
     }
 
-    public static TripsConfig initTripsConfig() {
-        return new TripsConfig(
-                Context.getConfig().getLong("report.trip.minimalTripDuration", 300) * 1000,
-                Context.getConfig().getLong("report.trip.minimalTripDistance", 500),
-                Context.getConfig().getLong("report.trip.minimalParkingDuration", 300) * 1000,
-                Context.getConfig().getBoolean("report.trip.greedyParking"),
-                Context.getConfig().getLong("report.trip.minimalNoDataDuration", 3600) * 1000);
-    }
-
     private static TripReport calculateTrip(
             ArrayList<Position> positions, int startIndex, int endIndex, boolean ignoreOdometer) {
         Position startTrip = positions.get(startIndex);
@@ -156,7 +184,7 @@ public final class ReportUtils {
         long tripDuration = endTrip.getFixTime().getTime() - startTrip.getFixTime().getTime();
         long deviceId = startTrip.getDeviceId();
         trip.setDeviceId(deviceId);
-        trip.setDeviceName(Context.getIdentityManager().getDeviceById(deviceId).getName());
+        trip.setDeviceName(Context.getIdentityManager().getById(deviceId).getName());
 
         trip.setStartPositionId(startTrip.getId());
         trip.setStartLat(startTrip.getLatitude());
@@ -176,6 +204,9 @@ public final class ReportUtils {
         trip.setMaxSpeed(speedMax);
         trip.setSpentFuel(calculateFuel(startTrip, endTrip));
 
+        trip.setDriverUniqueId(findDriver(startTrip, endTrip));
+        trip.setDriverName(findDriverName(trip.getDriverUniqueId()));
+
         return trip;
     }
 
@@ -187,7 +218,7 @@ public final class ReportUtils {
 
         long deviceId = startStop.getDeviceId();
         stop.setDeviceId(deviceId);
-        stop.setDeviceName(Context.getIdentityManager().getDeviceById(deviceId).getName());
+        stop.setDeviceName(Context.getIdentityManager().getById(deviceId).getName());
 
         stop.setPositionId(startStop.getId());
         stop.setLatitude(startStop.getLatitude());
@@ -213,115 +244,79 @@ public final class ReportUtils {
 
     }
 
-    private static boolean isMoving(ArrayList<Position> positions, int index,
-            TripsConfig tripsConfig, double speedThreshold) {
-        if (tripsConfig.getMinimalNoDataDuration() > 0 && index < positions.size() - 1
-                && positions.get(index + 1).getFixTime().getTime() - positions.get(index).getFixTime().getTime()
-                >= tripsConfig.getMinimalNoDataDuration()) {
-            return false;
+    private static <T extends BaseReport> T calculateTripOrStop(ArrayList<Position> positions, int startIndex,
+            int endIndex, boolean ignoreOdometer, Class<T> reportClass) {
+        if (reportClass.equals(TripReport.class)) {
+            return (T) calculateTrip(positions, startIndex, endIndex, ignoreOdometer);
+        } else {
+            return (T) calculateStop(positions, startIndex, endIndex);
+        }
+    }
+
+    private static boolean isMoving(ArrayList<Position> positions, int index, TripsConfig tripsConfig) {
+        if (tripsConfig.getMinimalNoDataDuration() > 0) {
+            boolean beforeGap = index < positions.size() - 1
+                    && positions.get(index + 1).getFixTime().getTime() - positions.get(index).getFixTime().getTime()
+                    >= tripsConfig.getMinimalNoDataDuration();
+            boolean afterGap = index > 0
+                    && positions.get(index).getFixTime().getTime() - positions.get(index - 1).getFixTime().getTime()
+                    >= tripsConfig.getMinimalNoDataDuration();
+            if (beforeGap || afterGap) {
+                return false;
+            }
         }
         if (positions.get(index).getAttributes().containsKey(Position.KEY_MOTION)
                 && positions.get(index).getAttributes().get(Position.KEY_MOTION) instanceof Boolean) {
             return positions.get(index).getBoolean(Position.KEY_MOTION);
         } else {
-            return positions.get(index).getSpeed() > speedThreshold;
+            return positions.get(index).getSpeed() > tripsConfig.getSpeedThreshold();
         }
     }
 
-    public static Collection<BaseReport> detectTripsAndStops(TripsConfig tripsConfig, boolean ignoreOdometer,
-            double speedThreshold, Collection<Position> positionCollection, boolean trips) {
-
-        Collection<BaseReport> result = new ArrayList<>();
+    public static <T extends BaseReport> Collection<T> detectTripsAndStops(Collection<Position> positionCollection,
+            TripsConfig tripsConfig, boolean ignoreOdometer, Class<T> reportClass) {
+        Collection<T> result = new ArrayList<>();
 
         ArrayList<Position> positions = new ArrayList<>(positionCollection);
         if (positions != null && !positions.isEmpty()) {
-            int previousStartParkingIndex = 0;
-            int startParkingIndex = -1;
-            int previousEndParkingIndex = 0;
-            int endParkingIndex = 0;
-
-            boolean isMoving = false;
-            boolean isLast = false;
-            boolean skipped = false;
-            boolean tripFiltered = false;
-
+            boolean trips = reportClass.equals(TripReport.class);
+            MotionEventHandler  motionHandler = new MotionEventHandler(tripsConfig);
+            DeviceState deviceState = new DeviceState();
+            deviceState.setMotionState(isMoving(positions, 0, tripsConfig));
+            int startEventIndex = trips == deviceState.getMotionState() ? 0 : -1;
+            int startNoEventIndex = -1;
             for (int i = 0; i < positions.size(); i++) {
-                isMoving = isMoving(positions, i, tripsConfig, speedThreshold);
-                isLast = i == positions.size() - 1;
-
-                if ((isMoving || isLast) && startParkingIndex != -1) {
-                    if (!skipped || previousEndParkingIndex == 0) {
-                        previousEndParkingIndex = endParkingIndex;
-                    }
-                    endParkingIndex = i;
+                Map<Event, Position> event = motionHandler.updateMotionState(deviceState, positions.get(i),
+                        isMoving(positions, i, tripsConfig));
+                if (startEventIndex == -1
+                        && (trips != deviceState.getMotionState() && deviceState.getMotionPosition() != null
+                        || trips == deviceState.getMotionState() && event != null)) {
+                    startEventIndex = i;
+                    startNoEventIndex = -1;
+                } else if (trips != deviceState.getMotionState() && startEventIndex != -1
+                        && deviceState.getMotionPosition() == null && event == null) {
+                    startEventIndex = -1;
                 }
-                if (!isMoving && startParkingIndex == -1) {
-                    if (tripsConfig.getGreedyParking()) {
-                        long tripDuration = positions.get(i).getFixTime().getTime()
-                                - positions.get(endParkingIndex).getFixTime().getTime();
-                        double tripDistance = ReportUtils.calculateDistance(positions.get(endParkingIndex),
-                                positions.get(i), false);
-                        tripFiltered = tripDuration < tripsConfig.getMinimalTripDuration()
-                                && tripDistance < tripsConfig.getMinimalTripDistance();
-                        if (tripFiltered) {
-                            startParkingIndex = previousStartParkingIndex;
-                            endParkingIndex = previousEndParkingIndex;
-                            tripFiltered = false;
-                        } else {
-                            previousStartParkingIndex = i;
-                            startParkingIndex = i;
-                        }
-                    } else {
-                        long tripDuration = positions.get(i).getFixTime().getTime()
-                                - positions.get(previousEndParkingIndex).getFixTime().getTime();
-                        double tripDistance = ReportUtils.calculateDistance(positions.get(previousEndParkingIndex),
-                                positions.get(i), false);
-                        tripFiltered = tripDuration < tripsConfig.getMinimalTripDuration()
-                                && tripDistance < tripsConfig.getMinimalTripDistance();
-                        startParkingIndex = i;
-                    }
+                if (startNoEventIndex == -1
+                        && (trips == deviceState.getMotionState() && deviceState.getMotionPosition() != null
+                        || trips != deviceState.getMotionState() && event != null)) {
+                    startNoEventIndex = i;
+                } else if (startNoEventIndex != -1 && deviceState.getMotionPosition() == null && event == null) {
+                    startNoEventIndex = -1;
                 }
-                if (startParkingIndex != -1 && (endParkingIndex > startParkingIndex || isLast)) {
-                    long parkingDuration = positions.get(endParkingIndex).getFixTime().getTime()
-                            - positions.get(startParkingIndex).getFixTime().getTime();
-                    if ((parkingDuration >= tripsConfig.getMinimalParkingDuration() || isLast)
-                            && previousEndParkingIndex < startParkingIndex) {
-                        if (!tripFiltered) {
-                            if (trips) {
-                                result.add(calculateTrip(
-                                        positions, previousEndParkingIndex, startParkingIndex, ignoreOdometer));
-                            } else {
-                                if (result.isEmpty() && previousEndParkingIndex > previousStartParkingIndex) {
-                                    long previousParkingDuration = positions.get(previousEndParkingIndex)
-                                            .getFixTime().getTime() - positions.get(previousStartParkingIndex)
-                                            .getFixTime().getTime();
-                                    if (previousParkingDuration >= tripsConfig.getMinimalParkingDuration()) {
-                                        result.add(calculateStop(positions, previousStartParkingIndex,
-                                                previousEndParkingIndex));
-                                    }
-                                }
-                                result.add(calculateStop(positions, startParkingIndex, isLast ? i : endParkingIndex));
-                            }
-                        }
-                        previousEndParkingIndex = endParkingIndex;
-                        skipped = false;
-                    } else {
-                        skipped = true;
-                    }
-                    startParkingIndex = -1;
+                if (startEventIndex != -1 && startNoEventIndex != -1 && event != null
+                        && trips != deviceState.getMotionState()) {
+                    result.add(calculateTripOrStop(positions, startEventIndex, startNoEventIndex,
+                            ignoreOdometer, reportClass));
+                    startEventIndex = -1;
                 }
             }
-            if (result.isEmpty() && !trips) {
-                int end = isMoving && !tripsConfig.getGreedyParking()
-                        ? Math.max(endParkingIndex, previousEndParkingIndex) : positions.size() - 1;
-                long parkingDuration = positions.get(end).getFixTime().getTime()
-                        - positions.get(previousStartParkingIndex).getFixTime().getTime();
-                if (parkingDuration >= tripsConfig.getMinimalParkingDuration()) {
-                    result.add(calculateStop(positions, previousStartParkingIndex, end));
-                }
+            if (startEventIndex != -1 && (startNoEventIndex != -1 || !trips)) {
+                result.add(calculateTripOrStop(positions, startEventIndex,
+                            startNoEventIndex != -1 ? startNoEventIndex : positions.size() - 1,
+                            ignoreOdometer, reportClass));
             }
         }
-
         return result;
     }
 }
diff --git a/src/org/traccar/reports/Route.java b/src/org/traccar/reports/Route.java
index aa6b7105b..6adb00aae 100644
--- a/src/org/traccar/reports/Route.java
+++ b/src/org/traccar/reports/Route.java
@@ -39,6 +39,7 @@ public final class Route {
 
     public static Collection<Position> getObjects(long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<Position> result = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
@@ -50,6 +51,7 @@ public final class Route {
     public static void getExcel(OutputStream outputStream,
             long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException, IOException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<DeviceReport> devicesRoutes = new ArrayList<>();
         ArrayList<String> sheetNames = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
@@ -57,11 +59,11 @@ public final class Route {
             Collection<Position> positions = Context.getDataManager()
                     .getPositions(deviceId, from, to);
             DeviceReport deviceRoutes = new DeviceReport();
-            Device device = Context.getIdentityManager().getDeviceById(deviceId);
+            Device device = Context.getIdentityManager().getById(deviceId);
             deviceRoutes.setDeviceName(device.getName());
             sheetNames.add(WorkbookUtil.createSafeSheetName(deviceRoutes.getDeviceName()));
             if (device.getGroupId() != 0) {
-                Group group = Context.getDeviceManager().getGroupById(device.getGroupId());
+                Group group = Context.getGroupsManager().getById(device.getGroupId());
                 if (group != null) {
                     deviceRoutes.setGroupName(group.getName());
                 }
diff --git a/src/org/traccar/reports/Stops.java b/src/org/traccar/reports/Stops.java
index 64e589be1..14b3a2437 100644
--- a/src/org/traccar/reports/Stops.java
+++ b/src/org/traccar/reports/Stops.java
@@ -30,10 +30,8 @@ import org.apache.poi.ss.util.WorkbookUtil;
 import org.traccar.Context;
 import org.traccar.model.Device;
 import org.traccar.model.Group;
-import org.traccar.reports.model.BaseReport;
 import org.traccar.reports.model.DeviceReport;
 import org.traccar.reports.model.StopReport;
-import org.traccar.reports.model.TripsConfig;
 
 public final class Stops {
 
@@ -41,22 +39,20 @@ public final class Stops {
     }
 
     private static Collection<StopReport> detectStops(long deviceId, Date from, Date to) throws SQLException {
-        double speedThreshold = Context.getConfig().getDouble("event.motion.speedThreshold", 0.01);
-
-        TripsConfig tripsConfig = ReportUtils.initTripsConfig();
-
         boolean ignoreOdometer = Context.getDeviceManager()
                 .lookupAttributeBoolean(deviceId, "report.ignoreOdometer", false, true);
 
-        Collection<? extends BaseReport> result = ReportUtils.detectTripsAndStops(tripsConfig,
-                ignoreOdometer, speedThreshold,
-                Context.getDataManager().getPositions(deviceId, from, to), false);
+        Collection<StopReport> result = ReportUtils.detectTripsAndStops(
+                Context.getDataManager().getPositions(deviceId, from, to),
+                Context.getTripsConfig(), ignoreOdometer, StopReport.class);
 
-        return (Collection<StopReport>) result;
+        return result;
     }
 
-    public static Collection<StopReport> getObjects(long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
+    public static Collection<StopReport> getObjects(
+            long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<StopReport> result = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
@@ -65,20 +61,21 @@ public final class Stops {
         return result;
     }
 
-    public static void getExcel(OutputStream outputStream,
-            long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
+    public static void getExcel(
+            OutputStream outputStream, long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException, IOException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<DeviceReport> devicesStops = new ArrayList<>();
         ArrayList<String> sheetNames = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
             Collection<StopReport> stops = detectStops(deviceId, from, to);
             DeviceReport deviceStops = new DeviceReport();
-            Device device = Context.getIdentityManager().getDeviceById(deviceId);
+            Device device = Context.getIdentityManager().getById(deviceId);
             deviceStops.setDeviceName(device.getName());
             sheetNames.add(WorkbookUtil.createSafeSheetName(deviceStops.getDeviceName()));
             if (device.getGroupId() != 0) {
-                Group group = Context.getDeviceManager().getGroupById(device.getGroupId());
+                Group group = Context.getGroupsManager().getById(device.getGroupId());
                 if (group != null) {
                     deviceStops.setGroupName(group.getName());
                 }
diff --git a/src/org/traccar/reports/Summary.java b/src/org/traccar/reports/Summary.java
index 5aaf33fae..366e40421 100644
--- a/src/org/traccar/reports/Summary.java
+++ b/src/org/traccar/reports/Summary.java
@@ -38,7 +38,7 @@ public final class Summary {
     private static SummaryReport calculateSummaryResult(long deviceId, Date from, Date to) throws SQLException {
         SummaryReport result = new SummaryReport();
         result.setDeviceId(deviceId);
-        result.setDeviceName(Context.getIdentityManager().getDeviceById(deviceId).getName());
+        result.setDeviceName(Context.getIdentityManager().getById(deviceId).getName());
         Collection<Position> positions = Context.getDataManager().getPositions(deviceId, from, to);
         if (positions != null && !positions.isEmpty()) {
             Position firstPosition = null;
@@ -68,6 +68,7 @@ public final class Summary {
 
     public static Collection<SummaryReport> getObjects(long userId, Collection<Long> deviceIds,
             Collection<Long> groupIds, Date from, Date to) throws SQLException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<SummaryReport> result = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
@@ -79,6 +80,7 @@ public final class Summary {
     public static void getExcel(OutputStream outputStream,
             long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException, IOException {
+        ReportUtils.checkPeriodLimit(from, to);
         Collection<SummaryReport> summaries = getObjects(userId, deviceIds, groupIds, from, to);
         String templatePath = Context.getConfig().getString("report.templatesPath",
                 "templates/export/");
diff --git a/src/org/traccar/reports/Trips.java b/src/org/traccar/reports/Trips.java
index 5c26bea54..696defa94 100644
--- a/src/org/traccar/reports/Trips.java
+++ b/src/org/traccar/reports/Trips.java
@@ -29,10 +29,8 @@ import org.apache.poi.ss.util.WorkbookUtil;
 import org.traccar.Context;
 import org.traccar.model.Device;
 import org.traccar.model.Group;
-import org.traccar.reports.model.BaseReport;
 import org.traccar.reports.model.DeviceReport;
 import org.traccar.reports.model.TripReport;
-import org.traccar.reports.model.TripsConfig;
 
 public final class Trips {
 
@@ -40,22 +38,19 @@ public final class Trips {
     }
 
     private static Collection<TripReport> detectTrips(long deviceId, Date from, Date to) throws SQLException {
-        double speedThreshold = Context.getConfig().getDouble("event.motion.speedThreshold", 0.01);
-
-        TripsConfig tripsConfig = ReportUtils.initTripsConfig();
-
         boolean ignoreOdometer = Context.getDeviceManager()
                 .lookupAttributeBoolean(deviceId, "report.ignoreOdometer", false, true);
 
-        Collection<? extends BaseReport> result = ReportUtils.detectTripsAndStops(tripsConfig,
-                ignoreOdometer, speedThreshold,
-                Context.getDataManager().getPositions(deviceId, from, to), true);
+        Collection<TripReport> result = ReportUtils.detectTripsAndStops(
+                Context.getDataManager().getPositions(deviceId, from, to),
+                Context.getTripsConfig(), ignoreOdometer, TripReport.class);
 
-        return (Collection<TripReport>) result;
+        return result;
     }
 
     public static Collection<TripReport> getObjects(long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<TripReport> result = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
@@ -67,17 +62,18 @@ public final class Trips {
     public static void getExcel(OutputStream outputStream,
             long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
             Date from, Date to) throws SQLException, IOException {
+        ReportUtils.checkPeriodLimit(from, to);
         ArrayList<DeviceReport> devicesTrips = new ArrayList<>();
         ArrayList<String> sheetNames = new ArrayList<>();
         for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
             Context.getPermissionsManager().checkDevice(userId, deviceId);
             Collection<TripReport> trips = detectTrips(deviceId, from, to);
             DeviceReport deviceTrips = new DeviceReport();
-            Device device = Context.getIdentityManager().getDeviceById(deviceId);
+            Device device = Context.getIdentityManager().getById(deviceId);
             deviceTrips.setDeviceName(device.getName());
             sheetNames.add(WorkbookUtil.createSafeSheetName(deviceTrips.getDeviceName()));
             if (device.getGroupId() != 0) {
-                Group group = Context.getDeviceManager().getGroupById(device.getGroupId());
+                Group group = Context.getGroupsManager().getById(device.getGroupId());
                 if (group != null) {
                     deviceTrips.setGroupName(group.getName());
                 }
diff --git a/src/org/traccar/reports/model/TripReport.java b/src/org/traccar/reports/model/TripReport.java
index efe556f79..42a4240b7 100644
--- a/src/org/traccar/reports/model/TripReport.java
+++ b/src/org/traccar/reports/model/TripReport.java
@@ -145,4 +145,24 @@ public class TripReport extends BaseReport {
     public void setDuration(long duration) {
         this.duration = duration;
     }
+
+    private String driverUniqueId;
+
+    public String getDriverUniqueId() {
+        return driverUniqueId;
+    }
+
+    public void setDriverUniqueId(String driverUniqueId) {
+        this.driverUniqueId = driverUniqueId;
+    }
+
+    private String driverName;
+
+    public String getDriverName() {
+        return driverName;
+    }
+
+    public void setDriverName(String driverName) {
+        this.driverName = driverName;
+    }
 }
diff --git a/src/org/traccar/reports/model/TripsConfig.java b/src/org/traccar/reports/model/TripsConfig.java
index 7067781d7..0f0c615d3 100644
--- a/src/org/traccar/reports/model/TripsConfig.java
+++ b/src/org/traccar/reports/model/TripsConfig.java
@@ -21,13 +21,15 @@ public class TripsConfig {
     public TripsConfig() {
     }
 
-    public TripsConfig(double minimalTripDistance, long minimalTripDuration,
-            long minimalParkingDuration, boolean greedyParking, long minimalNoDataDuration) {
+    public TripsConfig(double minimalTripDistance, long minimalTripDuration, long minimalParkingDuration,
+            long minimalNoDataDuration, boolean useIgnition, boolean processInvalidPositions, double speedThreshold) {
         this.minimalTripDistance = minimalTripDistance;
         this.minimalTripDuration = minimalTripDuration;
         this.minimalParkingDuration = minimalParkingDuration;
-        this.greedyParking = greedyParking;
         this.minimalNoDataDuration = minimalNoDataDuration;
+        this.useIgnition = useIgnition;
+        this.processInvalidPositions = processInvalidPositions;
+        this.speedThreshold = speedThreshold;
     }
 
     private double minimalTripDistance;
@@ -60,16 +62,6 @@ public class TripsConfig {
         this.minimalParkingDuration = minimalParkingDuration;
     }
 
-    private boolean greedyParking;
-
-    public boolean getGreedyParking() {
-        return greedyParking;
-    }
-
-    public void setGreedyParking(boolean greedyParking) {
-        this.greedyParking = greedyParking;
-    }
-
     private long minimalNoDataDuration;
 
     public long getMinimalNoDataDuration() {
@@ -80,4 +72,34 @@ public class TripsConfig {
         this.minimalNoDataDuration = minimalNoDataDuration;
     }
 
+    private boolean useIgnition;
+
+    public boolean getUseIgnition() {
+        return useIgnition;
+    }
+
+    public void setUseIgnition(boolean useIgnition) {
+        this.useIgnition = useIgnition;
+    }
+
+    private boolean processInvalidPositions;
+
+    public boolean getProcessInvalidPositions() {
+        return processInvalidPositions;
+    }
+
+    public void setProcessInvalidPositions(boolean processInvalidPositions) {
+        this.processInvalidPositions = processInvalidPositions;
+    }
+
+    private double speedThreshold;
+
+    public double getSpeedThreshold() {
+        return speedThreshold;
+    }
+
+    public void setSpeedThreshold(double speedThreshold) {
+        this.speedThreshold = speedThreshold;
+    }
+
 }
diff --git a/src/org/traccar/web/WebServer.java b/src/org/traccar/web/WebServer.java
index 83ead7ad8..e145ff554 100644
--- a/src/org/traccar/web/WebServer.java
+++ b/src/org/traccar/web/WebServer.java
@@ -15,7 +15,10 @@
  */
 package org.traccar.web;
 
+import org.eclipse.jetty.http.HttpMethod;
 import org.eclipse.jetty.http.HttpStatus;
+import org.eclipse.jetty.proxy.AsyncProxyServlet;
+import org.eclipse.jetty.server.Request;
 import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.server.SessionManager;
 import org.eclipse.jetty.server.handler.ErrorHandler;
@@ -29,6 +32,7 @@ import org.glassfish.jersey.jackson.JacksonFeature;
 import org.glassfish.jersey.server.ResourceConfig;
 import org.glassfish.jersey.servlet.ServletContainer;
 import org.traccar.Config;
+import org.traccar.Context;
 import org.traccar.api.AsyncSocketServlet;
 import org.traccar.api.CorsResponseFilter;
 import org.traccar.api.ObjectMapperProvider;
@@ -38,7 +42,9 @@ import org.traccar.api.resource.ServerResource;
 import org.traccar.helper.Log;
 
 import javax.naming.InitialContext;
+import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 import javax.sql.DataSource;
 import java.io.IOException;
 import java.io.Writer;
@@ -86,6 +92,7 @@ public class WebServer {
                 initWebApp();
                 break;
         }
+        initClientProxy();
         server.setHandler(handlers);
 
         server.addBean(new ErrorHandler() {
@@ -98,6 +105,26 @@ public class WebServer {
         }, false);
     }
 
+    private void initClientProxy() {
+        int port = Context.getConfig().getInteger("osmand.port");
+        if (port != 0) {
+            ServletContextHandler servletHandler = new ServletContextHandler() {
+                @Override
+                public void doScope(
+                        String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
+                        throws IOException, ServletException {
+                    if (target.equals("/") && request.getMethod().equals(HttpMethod.POST.asString())) {
+                        super.doScope(target, baseRequest, request, response);
+                    }
+                }
+            };
+            ServletHolder servletHolder = new ServletHolder(new AsyncProxyServlet.Transparent());
+            servletHolder.setInitParameter("proxyTo", "http://localhost:" + port);
+            servletHandler.addServlet(servletHolder, "/");
+            handlers.addHandler(servletHandler);
+        }
+    }
+
     private void initWebApp() {
         ResourceHandler resourceHandler = new ResourceHandler();
         resourceHandler.setResourceBase(config.getString("web.path"));
@@ -105,7 +132,10 @@ public class WebServer {
             resourceHandler.setWelcomeFiles(new String[] {"debug.html", "index.html"});
             resourceHandler.setMinMemoryMappedContentLength(-1); // avoid locking files on Windows
         } else {
-            resourceHandler.setCacheControl("max-age=3600,public");
+            String cache = config.getString("web.cacheControl");
+            if (cache != null && !cache.isEmpty()) {
+                resourceHandler.setCacheControl(cache);
+            }
             resourceHandler.setWelcomeFiles(new String[] {"release.html", "index.html"});
         }
         handlers.addHandler(resourceHandler);