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/*
* Copyright 2023 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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import org.traccar.session.DeviceSession;
import java.net.SocketAddress;
public class TranSyncProtocolDecoder extends BaseProtocolDecoder {
public TranSyncProtocolDecoder(Protocol protocol) {
super(protocol);
}
private String decodeAlarm(int value) {
return switch (value) {
case 4 -> Position.ALARM_LOW_BATTERY;
case 6 -> Position.ALARM_POWER_RESTORED;
case 10 -> Position.ALARM_SOS;
case 13 -> Position.ALARM_BRAKING;
case 14 -> Position.ALARM_ACCELERATION;
case 17 -> Position.ALARM_OVERSPEED;
case 23 -> Position.ALARM_ACCIDENT;
default -> null;
};
}
@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedShort(); // header
buf.readByte(); // length
int lac = buf.readUnsignedShort();
String deviceId = ByteBufUtil.hexDump(buf.readSlice(8));
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, deviceId);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedShort(); // index
buf.readUnsignedByte(); // type
position.setTime(new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.getDate());
double latitude = buf.readUnsignedInt() / 1800000.0;
double longitude = buf.readUnsignedInt() / 1800000.0;
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedShort());
int mnc = buf.readUnsignedByte();
int cid = buf.readUnsignedShort();
int status0 = buf.readUnsignedByte();
position.setValid(BitUtil.check(status0, 0));
position.setLatitude(BitUtil.check(status0, 1) ? latitude : -latitude);
position.setLongitude(BitUtil.check(status0, 2) ? longitude : -longitude);
position.set(Position.PREFIX_OUT + 1, BitUtil.check(status0, 7));
position.set(Position.PREFIX_OUT + 2, BitUtil.check(status0, 6));
position.set(Position.PREFIX_IN + 3, BitUtil.check(status0, 5));
if (BitUtil.check(status0, 4)) {
position.set(Position.KEY_ALARM, Position.ALARM_POWER_OFF);
}
position.set(Position.KEY_IGNITION, BitUtil.check(status0, 3));
buf.readUnsignedByte(); // reserved
int event = buf.readUnsignedByte();
position.set(Position.KEY_ALARM, decodeAlarm(event));
position.set(Position.KEY_EVENT, event);
int status3 = buf.readUnsignedByte();
if (BitUtil.check(status3, 7)) {
position.set(Position.KEY_ARCHIVE, true);
}
if (BitUtil.check(status3, 5)) {
position.set(Position.KEY_ALARM, Position.ALARM_GPS_ANTENNA_CUT);
}
int rssi = buf.readUnsignedByte();
CellTower cellTower = CellTower.fromLacCid(getConfig(), lac, cid);
cellTower.setMobileNetworkCode(mnc);
cellTower.setSignalStrength(rssi);
position.setNetwork(new Network(cellTower));
position.set(Position.KEY_BATTERY, (double) (buf.readUnsignedByte() / 10));
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_HDOP, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 1, (short) buf.readUnsignedShort());
if (buf.readableBytes() > 5) {
buf.readUnsignedByte(); // odometer id
int length = buf.readUnsignedByte();
if (length > 0) {
position.set(Position.KEY_ODOMETER, buf.readBytes(length).readInt());
}
}
if (buf.readableBytes() > 5) {
buf.readUnsignedByte(); // rfid id
int length = buf.readUnsignedByte();
if (length > 0) {
position.set(Position.KEY_DRIVER_UNIQUE_ID, ByteBufUtil.hexDump(buf.readSlice(length)));
}
}
if (buf.readableBytes() > 5) {
buf.readUnsignedByte(); // adc2 id
int length = buf.readUnsignedByte();
if (length > 0) {
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
}
}
if (buf.readableBytes() > 5) {
buf.readUnsignedByte(); // adc3 id
int length = buf.readUnsignedByte();
if (length > 0 && length <= buf.readableBytes() - 2) {
position.set(Position.PREFIX_ADC + 3, buf.readUnsignedShort());
}
}
return position;
}
}
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