Implement OBD dongle protocol

1 files changed, 128 insertions, 0 deletions

diff --git a/src/org/traccar/protocol/ObdDongleProtocolDecoder.java b/src/org/traccar/protocol/ObdDongleProtocolDecoder.java
new file mode 100644
index 000000000..84ff1450a
--- /dev/null
+++ b/src/org/traccar/protocol/ObdDongleProtocolDecoder.java
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+public class ObdDongleProtocolDecoder extends BaseProtocolDecoder {
+
+    public ObdDongleProtocolDecoder(ObdDongleProtocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_TYPE_CONNECT = 0x01;
+    public static final int MSG_TYPE_CONNACK = 0x02;
+    public static final int MSG_TYPE_PUBLISH = 0x03;
+    public static final int MSG_TYPE_PUBACK = 0x04;
+    public static final int MSG_TYPE_PINGREQ = 0x0C;
+    public static final int MSG_TYPE_PINGRESP = 0x0D;
+    public static final int MSG_TYPE_DISCONNECT = 0x0E;
+
+    private static void sendResponse(Channel channel, int type, int index, String imei, ChannelBuffer content) {
+        if (channel != null) {
+            ChannelBuffer response = ChannelBuffers.dynamicBuffer();
+            response.writeShort(0x5555); // header
+            response.writeShort(index);
+            response.writeBytes(imei.getBytes(StandardCharsets.US_ASCII));
+            response.writeByte(type);
+            response.writeShort(content.readableBytes());
+            response.writeBytes(content);
+            response.writeByte(0); // checksum
+            response.writeShort(0xAAAA);
+            channel.write(response);
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.skipBytes(2); // header
+        int index = buf.readUnsignedShort();
+
+        String imei = buf.readBytes(15).toString(StandardCharsets.US_ASCII);
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        int type = buf.readUnsignedByte();
+
+        buf.readUnsignedShort(); // data length
+
+        if (type == MSG_TYPE_CONNECT) {
+
+            ChannelBuffer response = ChannelBuffers.dynamicBuffer();
+            response.writeByte(1);
+            response.writeShort(0);
+            response.writeInt(0);
+            sendResponse(channel, MSG_TYPE_CONNACK, index, imei, response);
+
+        } else if (type == MSG_TYPE_PUBLISH) {
+
+            int typeMajor = buf.readUnsignedByte();
+            int typeMinor = buf.readUnsignedByte();
+
+            buf.readUnsignedByte(); // event id
+
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setTime(new Date(buf.readUnsignedInt() * 1000));
+
+            int flags = buf.readUnsignedByte();
+
+            position.setValid(!BitUtil.check(flags, 6));
+
+            position.set(Position.KEY_SATELLITES, BitUtil.to(flags, 4));
+
+            double longitude = ((BitUtil.to(buf.readUnsignedShort(), 1) << 24) + buf.readUnsignedMedium()) * 0.00001;
+            position.setLongitude(BitUtil.check(flags, 5) ? longitude : -longitude);
+
+            double latitude = buf.readUnsignedMedium() * 0.00001;
+            position.setLatitude(BitUtil.check(flags, 4) ? latitude : -latitude);
+
+            int speedCourse = buf.readUnsignedMedium();
+            position.setSpeed(UnitsConverter.knotsFromMph(BitUtil.from(speedCourse, 10) * 0.1));
+            position.setCourse(BitUtil.to(speedCourse, 10));
+
+            ChannelBuffer response = ChannelBuffers.dynamicBuffer();
+            response.writeByte(typeMajor);
+            response.writeByte(typeMinor);
+            sendResponse(channel, MSG_TYPE_PUBACK, index, imei, response);
+
+            return position;
+
+        }
+
+        return null;
+    }
+
+}