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Diffstat (limited to 'src/org/traccar/protocol/ObdDongleProtocolDecoder.java')
-rw-r--r--src/org/traccar/protocol/ObdDongleProtocolDecoder.java128
1 files changed, 128 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/ObdDongleProtocolDecoder.java b/src/org/traccar/protocol/ObdDongleProtocolDecoder.java
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+++ b/src/org/traccar/protocol/ObdDongleProtocolDecoder.java
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+/*
+ * 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;
+ }
+
+}