Add support for CalAmp protocol

1 files changed, 240 insertions, 0 deletions

diff --git a/src/org/traccar/protocol/CalAmpProtocolDecoder.java b/src/org/traccar/protocol/CalAmpProtocolDecoder.java
new file mode 100644
index 000000000..7850de1ca
--- /dev/null
+++ b/src/org/traccar/protocol/CalAmpProtocolDecoder.java
@@ -0,0 +1,240 @@
+package org.traccar.protocol;
+
+import java.net.SocketAddress;
+import java.util.Date;
+import java.util.Properties;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelEvent;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.channel.Channels;
+import org.jboss.netty.channel.MessageEvent;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.database.DataManager;
+import org.traccar.helper.Log;
+import org.traccar.model.ExtendedInfoFormatter;
+import org.traccar.model.Position;
+
+public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
+
+    public CalAmpProtocolDecoder(DataManager dataManager, String protocol, Properties properties) {
+        super(dataManager, protocol, properties);
+    }
+
+    private static final int MSG_NULL = 0;
+    private static final int MSG_ACK = 1;
+    private static final int MSG_EVENT_REPORT = 2;
+    private static final int MSG_ID_REPORT = 3;
+    private static final int MSG_USER_DATA = 4;
+    private static final int MSG_APP_DATA = 5;
+    private static final int MSG_CONFIG = 6;
+    private static final int MSG_UNIT_REQUEST = 7;
+    private static final int MSG_LOCATE_REPORT = 8;
+    private static final int MSG_USER_DATA_ACC = 9;
+    private static final int MSG_MINI_EVENT_REPORT = 10;
+    private static final int MSG_MINI_USER_DATA = 11;
+
+    private static final int SERVICE_UNACKNOWLEDGED = 0;
+    private static final int SERVICE_ACKNOWLEDGED = 1;
+    private static final int SERVICE_RESPONSE = 2;
+
+    @Override
+    public void handleUpstream(
+            ChannelHandlerContext ctx, ChannelEvent evt)
+            throws Exception {
+
+        if (!(evt instanceof MessageEvent)) {
+            ctx.sendUpstream(evt);
+            return;
+        }
+
+        MessageEvent e = (MessageEvent) evt;
+        Object decodedMessage = decode(ctx, e.getChannel(), e.getMessage(), e.getRemoteAddress());
+        if (decodedMessage != null) {
+            Channels.fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
+        }
+    }
+
+    private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int index, int result) {
+        if (channel != null) {
+            ChannelBuffer response = ChannelBuffers.directBuffer(10);
+            response.writeByte(SERVICE_RESPONSE);
+            response.writeByte(MSG_ACK);
+            response.writeShort(index);
+            response.writeByte(type);
+            response.writeByte(result);
+            response.writeByte(0);
+            response.writeMedium(0);
+            channel.write(response, remoteAddress);
+        }
+    }
+
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, Object msg, SocketAddress remoteAddress)
+            throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        Long deviceId = null;
+
+        // Check options header
+        if ((buf.getByte(buf.readerIndex()) & 0x80) != 0) {
+
+            int content = buf.readUnsignedByte();
+
+            // Identifier
+            if ((content & 0x01) != 0) {
+
+                // Read identifier
+                int length = buf.readUnsignedByte();
+                long id = 0;
+                for (int i = 0; i < length; i++) {
+                    int b = buf.readUnsignedByte();
+                    id = id * 10 + (b >> 4);
+                    if ((b & 0xf) != 0xf) {
+                        id = id * 10 + (b & 0xf);
+                    }
+                }
+
+                // Find device in database
+                String stringId = String.valueOf(id);
+                try {
+                    deviceId = getDataManager().getDeviceByImei(stringId).getId();
+                } catch(Exception error) {
+                    Log.warning("Unknown device - " + stringId);
+                }
+
+            }
+
+            // Identifier type
+            if ((content & 0x02) != 0) {
+                buf.skipBytes(buf.readUnsignedByte());
+            }
+
+            // Authentication
+            if ((content & 0x04) != 0) {
+                buf.skipBytes(buf.readUnsignedByte());
+            }
+
+            // Routing
+            if ((content & 0x08) != 0) {
+                buf.skipBytes(buf.readUnsignedByte());
+            }
+
+            // Forwarding
+            if ((content & 0x10) != 0) {
+                buf.skipBytes(buf.readUnsignedByte());
+            }
+
+            // Responce redirection
+            if ((content & 0x20) != 0) {
+                buf.skipBytes(buf.readUnsignedByte());
+            }
+
+        }
+
+        // Unidentified device
+        if (deviceId == null) {
+            Log.warning("Unknown device");
+            return null;
+        }
+
+        int service = buf.readUnsignedByte();
+        int type = buf.readUnsignedByte();
+        int index = buf.readUnsignedShort();
+
+        // Send acknowledgement
+        if (service == SERVICE_ACKNOWLEDGED) {
+            sendResponse(channel, remoteAddress, type, index, 0);
+        }
+
+        if (type == MSG_EVENT_REPORT ||
+            type == MSG_LOCATE_REPORT ||
+            type == MSG_MINI_EVENT_REPORT) {
+
+            // Create new position
+            Position position = new Position();
+            position.setDeviceId(deviceId);
+            ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("calamp");
+
+            // Location data
+            position.setTime(new Date(buf.readUnsignedInt() * 1000));
+            if (type != MSG_MINI_EVENT_REPORT) {
+                buf.readUnsignedInt(); // fix time
+            }
+            position.setLatitude(buf.readInt() * 0.0000001);
+            position.setLongitude(buf.readInt() * 0.0000001);
+            if (type != MSG_MINI_EVENT_REPORT) {
+                position.setAltitude(buf.readInt() * 0.01);
+                position.setSpeed(buf.readUnsignedInt() * 0.0194384449); // cm/s
+            }
+            position.setCourse((double) buf.readShort());
+            if (type == MSG_MINI_EVENT_REPORT) {
+                position.setAltitude(0.0);
+                position.setSpeed(buf.readUnsignedByte() * 0.539957); // km/h
+            }
+
+            // Fix status
+            if (type == MSG_MINI_EVENT_REPORT) {
+                extendedInfo.set("satellites", buf.getUnsignedByte(buf.readerIndex()) & 0xf);
+                position.setValid((buf.readUnsignedByte() & 0x20) == 0);
+            } else {
+                extendedInfo.set("satellites", buf.readUnsignedByte());
+                position.setValid((buf.readUnsignedByte() & 0x08) == 0);
+            }
+
+            if (type != MSG_MINI_EVENT_REPORT) {
+
+                // Carrier
+                extendedInfo.set("carrier", buf.readUnsignedShort());
+
+                // Cell signal
+                extendedInfo.set("gsm", buf.readShort());
+
+            }
+
+            // Modem state
+            extendedInfo.set("modem", buf.readUnsignedByte());
+
+            // HDOP
+            if (type != MSG_MINI_EVENT_REPORT) {
+                extendedInfo.set("hdop", buf.readUnsignedByte());
+            }
+
+            // Inputs
+            extendedInfo.set("input", buf.readUnsignedByte());
+
+            // Unit status
+            if (type != MSG_MINI_EVENT_REPORT) {
+                extendedInfo.set("status", buf.readUnsignedByte());
+            }
+
+            // Event code and status
+            if (type == MSG_EVENT_REPORT || type == MSG_MINI_EVENT_REPORT) {
+                extendedInfo.set("event", buf.readUnsignedByte());
+            }
+
+            // Accumulators
+            /*int accCount = buf.readUnsignedByte();
+            int accType = accCount >> 6;
+            accCount &= 0x3f;
+
+            if (accType == 1) {
+                buf.readUnsignedInt(); // threshold
+                buf.readUnsignedInt(); // mask
+            }
+
+            for (int i = 0; i < accCount; i++) {
+                extendedInfo.set("acc" + i, buf.readUnsignedInt());
+            }*/
+
+            position.setExtendedInfo(extendedInfo.toString());
+            return position;
+
+        }
+
+        return null;
+    }
+
+}