1 files changed, 145 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/Avl301ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Avl301ProtocolDecoder.java
new file mode 100644
index 000000000..f6b7db2d6
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/Avl301ProtocolDecoder.java
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2015 - 2018 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 io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.NetworkMessage;
+import org.traccar.Protocol;
+import org.traccar.helper.DateBuilder;
+import org.traccar.model.CellTower;
+import org.traccar.model.Network;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+
+public class Avl301ProtocolDecoder extends BaseProtocolDecoder {
+
+    public Avl301ProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    private String readImei(ByteBuf buf) {
+        int b = buf.readUnsignedByte();
+        StringBuilder imei = new StringBuilder();
+        imei.append(b & 0x0F);
+        for (int i = 0; i < 7; i++) {
+            b = buf.readUnsignedByte();
+            imei.append((b & 0xF0) >> 4);
+            imei.append(b & 0x0F);
+        }
+        return imei.toString();
+    }
+
+    public static final int MSG_LOGIN = 'L';
+    public static final int MSG_STATUS = 'H';
+    public static final int MSG_GPS_LBS_STATUS = '$';
+
+    private void sendResponse(Channel channel, int type) {
+        if (channel != null) {
+            ByteBuf response = Unpooled.buffer(5);
+            response.writeByte('$');
+            response.writeByte(type);
+            response.writeByte('#');
+            response.writeByte('\r'); response.writeByte('\n');
+            channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(1); // header
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedByte(); // length
+
+        if (type == MSG_LOGIN) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, readImei(buf));
+            if (deviceSession == null) {
+                sendResponse(channel, type);
+            }
+
+        } else if (type == MSG_STATUS) {
+
+            sendResponse(channel, type);
+
+        } else if (type == MSG_GPS_LBS_STATUS) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+            if (deviceSession == null) {
+                return null;
+            }
+
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            DateBuilder dateBuilder = new DateBuilder()
+                    .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
+                    .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+            position.setTime(dateBuilder.getDate());
+
+            int gpsLength = buf.readUnsignedByte(); // gps len and sat
+            position.set(Position.KEY_SATELLITES, gpsLength & 0xf);
+
+            position.set(Position.KEY_SATELLITES_VISIBLE, buf.readUnsignedByte()); // satellites
+
+            double latitude = buf.readUnsignedInt() / 600000.0;
+            double longitude = buf.readUnsignedInt() / 600000.0;
+            position.setSpeed(buf.readUnsignedByte());
+
+            int union = buf.readUnsignedShort(); // course and flags
+            position.setCourse(union & 0x03FF);
+            position.setValid((union & 0x1000) != 0);
+            if ((union & 0x0400) != 0) {
+                latitude = -latitude;
+            }
+            if ((union & 0x0800) != 0) {
+                longitude = -longitude;
+            }
+
+            position.setLatitude(latitude);
+            position.setLongitude(longitude);
+
+            if ((union & 0x4000) != 0) {
+                position.set("acc", (union & 0x8000) != 0);
+            }
+
+            position.setNetwork(new Network(
+                    CellTower.fromLacCid(buf.readUnsignedShort(), buf.readUnsignedMedium())));
+
+            position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
+            int flags = buf.readUnsignedByte();
+            position.set("acc", (flags & 0x2) != 0);
+
+            // parse other flags
+
+            position.set(Position.KEY_POWER, buf.readUnsignedByte());
+            position.set(Position.KEY_RSSI, buf.readUnsignedByte());
+
+            return position;
+        }
+
+        return null;
+    }
+
+}