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/*
* Copyright 2013 - 2014 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 java.net.SocketAddress;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class AtrackProtocolDecoder extends BaseProtocolDecoder {
public AtrackProtocolDecoder(String protocol) {
super(protocol);
}
private static final int MSG_HEARTBEAT = 0x1A;
private static final int MSG_DATA = 0x10;
private static final int MIN_DATA_LENGTH = 40;
private static void sendResponse(Channel channel, SocketAddress remoteAddress, long rawId, int index) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(12);
response.writeShort(0xfe02);
response.writeLong(rawId);
response.writeShort(index);
channel.write(response, remoteAddress);
}
}
private static String readString(ChannelBuffer buf) {
String result = null;
int length = 0;
while (buf.getByte(buf.readerIndex() + length) != 0) {
length += 1;
}
if (length != 0) {
result = buf.toString(buf.readerIndex(), length, Charset.defaultCharset());
buf.skipBytes(length);
}
buf.readByte();
return result;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Keep alive message
if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {
if (channel != null) {
channel.write(buf, remoteAddress);
}
return null;
}
buf.skipBytes(2); // prefix
buf.readUnsignedShort(); // checksum
buf.readUnsignedShort(); // length
int index = buf.readUnsignedShort();
// Get device id
long id = buf.readLong();
if (!identify(String.valueOf(id))) {
return null;
}
// Send acknowledgement
sendResponse(channel, remoteAddress, id, index);
List<Position> positions = new LinkedList<Position>();
while (buf.readableBytes() >= MIN_DATA_LENGTH) {
// Create new position
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocol());
// Date and time
position.setTime(new Date(buf.readUnsignedInt() * 1000)); // gps time
buf.readUnsignedInt(); // rtc time
buf.readUnsignedInt(); // send time
// Coordinates
position.setValid(true);
position.setLongitude(buf.readInt() * 0.000001);
position.setLatitude(buf.readInt() * 0.000001);
// Course
position.setCourse(buf.readUnsignedShort());
// Report type
position.set("type", buf.readUnsignedByte());
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt() * 0.1);
// Accuracy
position.set(Event.KEY_HDOP, buf.readUnsignedShort() * 0.1);
// Input
position.set(Event.KEY_INPUT, buf.readUnsignedByte());
// Speed
position.setSpeed(buf.readUnsignedShort() * 0.539957);
// Output
position.set(Event.KEY_OUTPUT, buf.readUnsignedByte());
// ADC
position.set(Event.PREFIX_ADC + 1, buf.readUnsignedShort() * 0.001);
// Driver
position.set("driver", readString(buf));
// Temperature
position.set(Event.PREFIX_TEMP + 1, buf.readShort() * 0.1);
position.set(Event.PREFIX_TEMP + 2, buf.readShort() * 0.1);
// Text Message
position.set("message", readString(buf));
// With AT$FORM Command you can extend atrack protocol.
// For example adding AT$FORM %FC /Fuel used you can add the line in this position:
// position.set("fuelused", buf.readUnsignedInt() * 0.1);
positions.add(position);
}
return positions;
}
}
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