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/*
* Copyright 2013 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.nio.charset.Charset;
import java.util.Date;
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.ServerManager;
import org.traccar.helper.Crc;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class AtrackProtocolDecoder extends BaseProtocolDecoder {
public AtrackProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
private String readImei(ChannelBuffer buf) {
int b = buf.readUnsignedByte();
StringBuilder imei = new StringBuilder();
imei.append(b & 0x0F);
for (int i = 0; i < 7; i++) {
b = buf.readUnsignedByte();
imei.append((b & 0xF0) >> 4);
imei.append(b & 0x0F);
}
return imei.toString();
}
private static final int MSG_HEARTBEAT = 0x1A;
private static final int MSG_DATA = 0x10;
private static void sendResponse(Channel channel, long rawId, int index) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(12);
response.writeShort(0xfe02);
response.writeLong(rawId);
response.writeShort(index);
channel.write(response);
}
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // prefix
buf.readUnsignedShort(); // checksum
buf.readUnsignedShort(); // length
int index = buf.readUnsignedShort();
// Create new position
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("atrack");
// Get device id
long rawId = buf.readLong();
String id = String.valueOf(rawId);
try {
position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + id);
return null;
}
// Send acknowledgement
sendResponse(channel, rawId, index);
// 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);
position.setAltitude(0.0);
// Course
position.setCourse((double) buf.readUnsignedShort());
// Report type
extendedInfo.set("type", buf.readUnsignedByte());
// Milage
extendedInfo.set("milage", buf.readUnsignedInt() * 0.1);
// Accuracy
extendedInfo.set("hdop", buf.readUnsignedShort() * 0.1);
// Input
extendedInfo.set("input", buf.readUnsignedByte());
// Speed
position.setSpeed(buf.readUnsignedShort() * 0.539957);
// Output
extendedInfo.set("output", buf.readUnsignedByte());
// ADC
extendedInfo.set("adc", buf.readUnsignedShort() * 0.001);
// Driver
int length = 0;
while (buf.getByte(buf.readerIndex() + length) != 0) {
length += 1;
}
if (length != 0) {
extendedInfo.set("driver",
buf.toString(buf.readerIndex(), length, Charset.defaultCharset()));
buf.skipBytes(length);
}
buf.readByte();
// Temperature
extendedInfo.set("temperature1", buf.readShort() * 0.1);
extendedInfo.set("temperature2", buf.readShort() * 0.1);
// TODO: text message
position.setExtendedInfo(extendedInfo.toString());
return position;
}
}
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