Implement VNET TG102 protocol

1 files changed, 105 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/protocol/VnetProtocolDecoder.java b/src/main/java/org/traccar/protocol/VnetProtocolDecoder.java
new file mode 100644
index 000000000..1ee00bd3f
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/VnetProtocolDecoder.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2019 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.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.NetworkMessage;
+import org.traccar.Protocol;
+import org.traccar.helper.BcdUtil;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+
+public class VnetProtocolDecoder extends BaseProtocolDecoder {
+
+    public VnetProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_LOGIN = 0x0000;
+    public static final int MSG_LBS = 0x32;
+    public static final int MSG_GPS = 0x33;
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(2); // header
+        int type = BitUtil.to(buf.readUnsignedShortLE(), 15);
+        buf.readUnsignedShortLE(); // length
+
+        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));
+
+        if (type == MSG_LOGIN) {
+
+            String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(0, 15);
+            getDeviceSession(channel, remoteAddress, imei);
+            if (channel != null) {
+                channel.writeAndFlush(new NetworkMessage(
+                        buf.retainedSlice(0, buf.writerIndex()), channel.remoteAddress()));
+            }
+
+        } else if (type == MSG_GPS) {
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+            if (deviceSession == null) {
+                return null;
+            }
+
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+            position.setTime(dateBuilder.getDate());
+
+            int value;
+            int degrees;
+
+            value = BcdUtil.readInteger(buf, 8);
+            degrees = value / 1000000;
+            double lat = degrees + value % 1000000 * 0.0001 / 60;
+
+            value = BcdUtil.readInteger(buf, 10);
+            degrees = value / 10000000;
+            double lon = degrees + value % 10000000 * 0.00001 / 60;
+
+            int flags = buf.readUnsignedByte();
+            position.setValid(BitUtil.check(flags, 0));
+            position.setLatitude(BitUtil.check(flags, 1) ? lat : -lat);
+            position.setLongitude(BitUtil.check(flags, 2) ? lon : -lon);
+
+            position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+            position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
+            position.setCourse(buf.readUnsignedByte() * 2);
+
+            return position;
+
+        }
+
+        return null;
+    }
+
+}