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/*
* Copyright 2015 - 2019 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.Protocol;
import org.traccar.helper.BcdUtil;
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 java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class T800xProtocolDecoder extends BaseProtocolDecoder {
public T800xProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN = 0x01;
public static final int MSG_GPS = 0x02;
public static final int MSG_HEARTBEAT = 0x03;
public static final int MSG_ALARM = 0x04;
public static final int MSG_NETWORK = 0x05;
public static final int MSG_COMMAND = 0x81;
private void sendResponse(Channel channel, short header, int type, int index, ByteBuf imei, int alarm) {
if (channel != null) {
ByteBuf response = Unpooled.buffer(alarm > 0 ? 16 : 15);
response.writeShort(header);
response.writeByte(type);
response.writeShort(response.capacity()); // length
response.writeShort(index);
response.writeBytes(imei);
if (alarm > 0) {
response.writeByte(alarm);
}
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private String decodeAlarm(int value) {
switch (value) {
case 1:
return Position.ALARM_POWER_CUT;
case 2:
return Position.ALARM_LOW_BATTERY;
case 3:
return Position.ALARM_SOS;
case 4:
return Position.ALARM_OVERSPEED;
case 5:
return Position.ALARM_GEOFENCE_ENTER;
case 6:
return Position.ALARM_GEOFENCE_EXIT;
case 7:
return Position.ALARM_TOW;
case 8:
case 10:
return Position.ALARM_VIBRATION;
case 21:
return Position.ALARM_JAMMING;
case 23:
return Position.ALARM_POWER_RESTORED;
case 24:
return Position.ALARM_LOW_POWER;
default:
return null;
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
short header = buf.readShort();
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
int index = buf.readUnsignedShort();
ByteBuf imei = buf.readSlice(8);
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, ByteBufUtil.hexDump(imei).substring(1));
if (deviceSession == null) {
return null;
}
if (type == MSG_GPS || type == MSG_ALARM) {
return decodePosition(channel, deviceSession, buf, header, type, index, imei);
} else if (type == MSG_COMMAND) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
buf.readUnsignedByte(); // protocol number
position.set(Position.KEY_RESULT, buf.toString(StandardCharsets.UTF_16LE));
sendResponse(channel, header, type, index, imei, 0);
return position;
}
sendResponse(channel, header, type, index, imei, 0);
return null;
}
private Position decodePosition(
Channel channel, DeviceSession deviceSession,
ByteBuf buf, short header, int type, int index, ByteBuf imei) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_INDEX, index);
if (header != 0x2727) {
buf.readUnsignedShort(); // acc on interval
buf.readUnsignedShort(); // acc off interval
buf.readUnsignedByte(); // angle compensation
buf.readUnsignedShort(); // distance compensation
position.set(Position.KEY_RSSI, BitUtil.to(buf.readUnsignedShort(), 7));
}
int status = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, BitUtil.to(status, 5));
if (header != 0x2727) {
buf.readUnsignedByte(); // gsensor manager status
buf.readUnsignedByte(); // other flags
buf.readUnsignedByte(); // heartbeat
buf.readUnsignedByte(); // relay status
buf.readUnsignedShort(); // drag alarm setting
int io = buf.readUnsignedShort();
position.set(Position.KEY_IGNITION, BitUtil.check(io, 14));
position.set("ac", BitUtil.check(io, 13));
for (int i = 0; i <= 2; i++) {
position.set(Position.PREFIX_OUT + (i + 1), BitUtil.check(io, 7 + i));
}
position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort());
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
}
int alarm = buf.readUnsignedByte();
position.set(Position.KEY_ALARM, decodeAlarm(alarm));
if (header != 0x2727) {
buf.readUnsignedByte(); // reserved
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
int battery = BcdUtil.readInteger(buf, 2);
if (battery == 0) {
battery = 100;
}
position.set(Position.KEY_BATTERY, battery);
}
DateBuilder dateBuilder = new DateBuilder()
.setYear(BcdUtil.readInteger(buf, 2))
.setMonth(BcdUtil.readInteger(buf, 2))
.setDay(BcdUtil.readInteger(buf, 2))
.setHour(BcdUtil.readInteger(buf, 2))
.setMinute(BcdUtil.readInteger(buf, 2))
.setSecond(BcdUtil.readInteger(buf, 2));
if (BitUtil.check(status, 6)) {
position.setValid(!BitUtil.check(status, 7));
position.setTime(dateBuilder.getDate());
position.setAltitude(buf.readFloatLE());
position.setLongitude(buf.readFloatLE());
position.setLatitude(buf.readFloatLE());
position.setSpeed(UnitsConverter.knotsFromKph(BcdUtil.readInteger(buf, 4) * 0.1));
position.setCourse(buf.readUnsignedShort());
} else {
getLastLocation(position, dateBuilder.getDate());
int mcc = buf.readUnsignedShortLE();
int mnc = buf.readUnsignedShortLE();
if (mcc != 0xffff && mnc != 0xffff) {
Network network = new Network();
for (int i = 0; i < 3; i++) {
network.addCellTower(CellTower.from(
mcc, mnc, buf.readUnsignedShortLE(), buf.readUnsignedShortLE()));
}
position.setNetwork(network);
}
}
if (header != 0x2727 && buf.readableBytes() >= 2) {
position.set(Position.KEY_POWER, BcdUtil.readInteger(buf, 4) * 0.01);
}
sendResponse(channel, header, type, index, imei, alarm);
return position;
}
}
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