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/*
* Copyright 2015 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 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.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class ThinkRaceProtocolDecoder extends BaseProtocolDecoder {
public ThinkRaceProtocolDecoder(ThinkRaceProtocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN = 0x80;
public static final int MSG_GPS = 0x90;
private static double convertCoordinate(long raw, boolean negative) {
long degrees = raw / 1000000;
double minutes = (raw % 1000000) * 0.0001;
double result = degrees + minutes / 60;
if (negative) {
result = -result;
}
return result;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
ChannelBuffer id = buf.readBytes(12);
buf.readUnsignedByte(); // separator
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
if (type == MSG_LOGIN) {
int command = buf.readUnsignedByte(); // 0x00 - heartbeat
if (command == 0x01) {
String imei = buf.toString(buf.readerIndex(), 15, StandardCharsets.US_ASCII);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession != null && channel != null) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer();
response.writeByte(0x48); response.writeByte(0x52); // header
response.writeBytes(id);
response.writeByte(0x2c); // separator
response.writeByte(type);
response.writeShort(0x0002); // length
response.writeShort(0x8000);
response.writeShort(0x0000); // checksum
channel.write(response);
}
}
} else if (type == MSG_GPS) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedInt() * 1000));
int flags = buf.readUnsignedByte();
position.setValid(true);
position.setLatitude(convertCoordinate(buf.readUnsignedInt(), !BitUtil.check(flags, 0)));
position.setLongitude(convertCoordinate(buf.readUnsignedInt(), !BitUtil.check(flags, 1)));
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedByte());
position.setNetwork(new Network(
CellTower.fromLacCid(buf.readUnsignedShort(), buf.readUnsignedShort())));
return position;
}
return null;
}
}
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