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/*
* Copyright 2012 - 2018 Anton Tananaev (anton@traccar.org)
*
* 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 io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
public Gt02ProtocolDecoder(Gt02Protocol protocol) {
super(protocol);
}
public static final int MSG_DATA = 0x10;
public static final int MSG_HEARTBEAT = 0x1A;
public static final int MSG_RESPONSE = 0x1C;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.readByte(); // size
Position position = new Position(getProtocolName());
// Zero for location messages
int power = buf.readUnsignedByte();
int gsm = buf.readUnsignedByte();
String imei = ByteBufUtil.hexDump(buf.readBytes(8)).substring(1);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
int type = buf.readUnsignedByte();
if (type == MSG_HEARTBEAT) {
getLastLocation(position, null);
position.set(Position.KEY_POWER, power);
position.set(Position.KEY_RSSI, gsm);
if (channel != null) {
byte[] response = {0x54, 0x68, 0x1A, 0x0D, 0x0A};
channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(response), remoteAddress));
}
} else if (type == MSG_DATA) {
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedShort());
buf.skipBytes(3); // reserved
long flags = buf.readUnsignedInt();
position.setValid(BitUtil.check(flags, 0));
if (!BitUtil.check(flags, 1)) {
latitude = -latitude;
}
if (!BitUtil.check(flags, 2)) {
longitude = -longitude;
}
position.setLatitude(latitude);
position.setLongitude(longitude);
} else if (type == MSG_RESPONSE) {
getLastLocation(position, null);
position.set(Position.KEY_RESULT,
buf.readBytes(buf.readUnsignedByte()).toString(StandardCharsets.US_ASCII));
} else {
return null;
}
return position;
}
}
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