1 files changed, 138 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/AutoTrackProtocolDecoder.java b/src/main/java/org/traccar/protocol/AutoTrackProtocolDecoder.java
new file mode 100644
index 000000000..3c1fd256b
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/AutoTrackProtocolDecoder.java
@@ -0,0 +1,138 @@
+/*
+ * Copyright 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.ByteBufUtil;
+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.Checksum;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.util.Date;
+
+public class AutoTrackProtocolDecoder extends BaseProtocolDecoder {
+
+    public AutoTrackProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_LOGIN_REQUEST = 51;
+    public static final int MSG_LOGIN_CONFIRM = 101;
+    public static final int MSG_TELEMETRY_1 = 52;
+    public static final int MSG_TELEMETRY_2 = 66;
+    public static final int MSG_TELEMETRY_3 = 67;
+    public static final int MSG_KEEP_ALIVE = 114;
+    public static final int MSG_TELEMETRY_CONFIRM = 123;
+
+    private Position decodeTelemetry(
+            Channel channel, SocketAddress remoteAddress, DeviceSession deviceSession, ByteBuf buf) {
+
+        Position position = new Position(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        position.setTime(new Date(1009843200000L + buf.readUnsignedIntLE() * 1000)); // seconds since 2002
+        position.setLatitude(buf.readIntLE() * 0.0000001);
+        position.setLongitude(buf.readIntLE() * 0.0000001);
+
+        position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
+        position.set(Position.KEY_FUEL_USED, buf.readUnsignedIntLE());
+
+        position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE()));
+        buf.readUnsignedShortLE(); // max speed
+
+        position.set(Position.KEY_INPUT, buf.readUnsignedShortLE());
+        buf.readUnsignedIntLE(); // di 3 count
+        buf.readUnsignedIntLE(); // di 4 count
+
+        for (int i = 0; i < 5; i++) {
+            position.set(Position.PREFIX_ADC + (i + 1), buf.readUnsignedShortLE());
+        }
+
+        position.setCourse(buf.readUnsignedShortLE());
+
+        position.set(Position.KEY_STATUS, buf.readUnsignedShortLE());
+        position.set(Position.KEY_EVENT, buf.readUnsignedShortLE());
+        position.set(Position.KEY_DRIVER_UNIQUE_ID, buf.readLongLE());
+
+        int index = buf.readUnsignedShortLE();
+
+        buf.readUnsignedShortLE(); // checksum
+
+        if (channel != null) {
+            ByteBuf response = Unpooled.buffer();
+            response.writeInt(0xF1F1F1F1); // sync
+            response.writeByte(MSG_TELEMETRY_CONFIRM);
+            response.writeShortLE(2); // length
+            response.writeShortLE(index);
+            response.writeShort(Checksum.crc16(Checksum.CRC16_XMODEM, response.nioBuffer()));
+            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+        }
+
+        return position;
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(4); // sync
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedShortLE(); // length
+
+        switch (type) {
+            case MSG_LOGIN_REQUEST:
+                String imei = ByteBufUtil.hexDump(buf.readBytes(8));
+                DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+                if (deviceSession == null) {
+                    return null;
+                }
+                int fuelConst = buf.readUnsignedShortLE();
+                int tripConst = buf.readUnsignedShortLE();
+                if (channel != null) {
+                    ByteBuf response = Unpooled.buffer();
+                    response.writeInt(0xF1F1F1F1); // sync
+                    response.writeByte(MSG_LOGIN_CONFIRM);
+                    response.writeShortLE(12); // length
+                    response.writeBytes(ByteBufUtil.decodeHexDump(imei));
+                    response.writeShortLE(fuelConst);
+                    response.writeShortLE(tripConst);
+                    response.writeShort(Checksum.crc16(Checksum.CRC16_XMODEM, response.nioBuffer()));
+                    channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+                }
+                return null;
+            case MSG_TELEMETRY_1:
+            case MSG_TELEMETRY_2:
+            case MSG_TELEMETRY_3:
+                deviceSession = getDeviceSession(channel, remoteAddress);
+                if (deviceSession == null) {
+                    return null;
+                }
+                return decodeTelemetry(channel, remoteAddress, deviceSession, buf);
+            default:
+                return null;
+        }
+    }
+
+}