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/*
* Copyright 2012 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.util.Calendar;
import java.util.TimeZone;
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.GenericProtocolDecoder;
import org.traccar.helper.Crc;
import org.traccar.helper.Log;
import org.traccar.model.DataManager;
import org.traccar.model.Position;
/**
* T55 tracker protocol decoder
*/
public class Gt06ProtocolDecoder extends GenericProtocolDecoder {
private Long deviceId;
/**
* Initialize
*/
public Gt06ProtocolDecoder(DataManager dataManager) {
super(dataManager);
}
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_LOGIN = 0x01;
private static final int MSG_DATA = 0x12;
private static final int MSG_HEARTBEAT = 0x13;
private static final int MSG_STRING = 0x15;
private static final int MSG_ALARM = 0x16;
private static void sendResponse(Channel channel, int type, int index) {
if (channel == null) {
ChannelBuffer response = ChannelBuffers.directBuffer(10);
response.writeByte(0x78); response.writeByte(0x78); // header
response.writeByte(0x05); // size
response.writeByte(type);
response.writeShort(index);
response.writeShort(Crc.crc16Ccitt(response.toByteBuffer(2, 4)));
response.writeByte(0x0D); response.writeByte(0x0A); // ending
channel.write(response);
}
}
/**
* Decode message
*/
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
buf.readByte(); // size
int type = buf.readUnsignedByte();
if (type == MSG_LOGIN) {
String imei = readImei(buf);
try {
deviceId = getDataManager().getDeviceByImei(imei).getId();
sendResponse(channel, type, buf.readUnsignedShort());
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
}
}
else if (type == MSG_HEARTBEAT) {
buf.skipBytes(5);
sendResponse(channel, type, buf.readUnsignedShort());
}
else if (type == MSG_DATA) {
// Create new position
Position position = new Position();
position.setDeviceId(deviceId);
StringBuilder extendedInfo = new StringBuilder("<protocol>gt06</protocol>");
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.HOUR, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
position.setTime(time.getTime());
// Satellites count
extendedInfo.append("<satellites>");
extendedInfo.append(buf.readUnsignedByte());
extendedInfo.append("</satellites>");
// Latitude
double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
// Longitude
double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);
// Speed
position.setSpeed((double) buf.readUnsignedByte());
// Course and flags
int union = buf.readUnsignedShort();
position.setCourse((double) (union & 0x03FF));
position.setValid((union & 0x1000) != 0);
if ((union & 0x0400) == 0) latitude = -latitude;
if ((union & 0x0800) == 0) longitude = -longitude;
position.setLatitude(latitude);
position.setLongitude(longitude);
position.setAltitude(0.0);
// Cell information
extendedInfo.append("<mcc>");
extendedInfo.append(buf.readUnsignedShort());
extendedInfo.append("</mcc>");
extendedInfo.append("<mnc>");
extendedInfo.append(buf.readUnsignedByte());
extendedInfo.append("</mnc>");
extendedInfo.append("<lac>");
extendedInfo.append(buf.readUnsignedShort());
extendedInfo.append("</lac>");
extendedInfo.append("<cell>");
extendedInfo.append(buf.readUnsignedShort() << 8 + buf.readUnsignedByte());
extendedInfo.append("</cell>");
// Index
position.setId((long) buf.readUnsignedShort());
position.setExtendedInfo(extendedInfo.toString());
return position;
}
return null;
}
}
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