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/*
* Copyright 2022 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.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Position;
import org.traccar.session.DeviceSession;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.LinkedList;
import java.util.List;
public class ThurayaProtocolDecoder extends BaseProtocolDecoder {
public ThurayaProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_EVENT = 0x5101;
public static final int MSG_PERIODIC_REPORT = 0x7101;
public static final int MSG_SETTING_RESPONSE = 0x8115;
public static final int MSG_ACK = 0x9901;
private static int checksum(ByteBuffer buf) {
int crc = 0;
while (buf.hasRemaining()) {
crc += buf.get();
}
crc = ~crc;
crc += 1;
return crc;
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, long id, int type) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeCharSequence("#T", StandardCharsets.US_ASCII);
response.writeShort(15); // length
response.writeShort(MSG_ACK);
response.writeInt((int) id);
response.writeShort(type);
response.writeShort(1); // server ok
response.writeShort(checksum(response.nioBuffer()));
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private void decodeLocation(ByteBuf buf, Position position) {
position.setValid(true);
DateBuilder dateBuilder = new DateBuilder();
int date = buf.readInt();
dateBuilder.setDay(date % 100);
date /= 100;
dateBuilder.setMonth(date % 100);
date /= 100;
dateBuilder.setYear(date);
int time = buf.readInt();
dateBuilder.setSecond(time % 100);
time /= 100;
dateBuilder.setMinute(time % 100);
time /= 100;
dateBuilder.setHour(time);
position.setTime(dateBuilder.getDate());
position.setLongitude(buf.readInt() / 1000000.0);
position.setLatitude(buf.readInt() / 1000000.0);
int data = buf.readUnsignedShort();
int ignition = BitUtil.from(data, 12);
if (ignition == 1) {
position.set(Position.KEY_IGNITION, true);
} else if (ignition == 2) {
position.set(Position.KEY_IGNITION, false);
}
position.setCourse(BitUtil.to(data, 12));
position.setSpeed(buf.readShort());
position.set(Position.KEY_RPM, buf.readShort());
position.set("data", readString(buf));
}
private String decodeAlarm(int event) {
return switch (event) {
case 10 -> Position.ALARM_VIBRATION;
case 11 -> Position.ALARM_OVERSPEED;
case 12 -> Position.ALARM_POWER_CUT;
case 13 -> Position.ALARM_LOW_BATTERY;
case 18 -> Position.ALARM_GPS_ANTENNA_CUT;
case 20 -> Position.ALARM_ACCELERATION;
case 21 -> Position.ALARM_BRAKING;
default -> null;
};
}
private String readString(ByteBuf buf) {
int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
CharSequence value = buf.readCharSequence(endIndex - buf.readerIndex(), StandardCharsets.US_ASCII);
buf.readUnsignedByte(); // delimiter
return value.toString();
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // service
buf.readUnsignedShort(); // length
int type = buf.readUnsignedShort();
long id = buf.readUnsignedInt();
sendResponse(channel, remoteAddress, id, type);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(id));
if (deviceSession == null) {
return null;
}
if (type == MSG_EVENT) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
decodeLocation(buf, position);
int event = buf.readUnsignedByte();
position.set(Position.KEY_ALARM, decodeAlarm(event));
position.set(Position.KEY_EVENT, event);
position.set("eventData", readString(buf));
return position;
} else if (type == MSG_PERIODIC_REPORT) {
List<Position> positions = new LinkedList<>();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
decodeLocation(buf, position);
positions.add(position);
}
return positions;
}
return null;
}
}
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