1 files changed, 125 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/Gt02ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt02ProtocolDecoder.java
new file mode 100644
index 000000000..78a3fd3ee
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/Gt02ProtocolDecoder.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2012 - 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.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+
+public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
+
+    public Gt02ProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_DATA = 0x10;
+    public static final int MSG_HEARTBEAT = 0x1A;
+    public static final int MSG_RESPONSE = 0x1C;
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(2); // header
+        buf.readByte(); // size
+
+        Position position = new Position(getProtocolName());
+
+        // Zero for location messages
+        int power = buf.readUnsignedByte();
+        int gsm = buf.readUnsignedByte();
+
+        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+        if (deviceSession == null) {
+            return null;
+        }
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        position.set(Position.KEY_INDEX, buf.readUnsignedShort());
+
+        int type = buf.readUnsignedByte();
+
+        if (type == MSG_HEARTBEAT) {
+
+            getLastLocation(position, null);
+
+            position.set(Position.KEY_POWER, power);
+            position.set(Position.KEY_RSSI, gsm);
+
+            if (channel != null) {
+                byte[] response = {0x54, 0x68, 0x1A, 0x0D, 0x0A};
+                channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(response), remoteAddress));
+            }
+
+        } else if (type == MSG_DATA) {
+
+            DateBuilder dateBuilder = new DateBuilder()
+                    .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
+                    .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+            position.setTime(dateBuilder.getDate());
+
+            double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
+            double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);
+
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+            position.setCourse(buf.readUnsignedShort());
+
+            buf.skipBytes(3); // reserved
+
+            long flags = buf.readUnsignedInt();
+            position.setValid(BitUtil.check(flags, 0));
+            if (!BitUtil.check(flags, 1)) {
+                latitude = -latitude;
+            }
+            if (!BitUtil.check(flags, 2)) {
+                longitude = -longitude;
+            }
+
+            position.setLatitude(latitude);
+            position.setLongitude(longitude);
+
+        } else if (type == MSG_RESPONSE) {
+
+            getLastLocation(position, null);
+
+            position.set(Position.KEY_RESULT,
+                    buf.readSlice(buf.readUnsignedByte()).toString(StandardCharsets.US_ASCII));
+
+        } else {
+
+            return null;
+
+        }
+
+        return position;
+    }
+
+}