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/*
* Copyright 2021 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import org.traccar.model.WifiAccessPoint;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class Xexun2ProtocolDecoder extends BaseProtocolDecoder {
public Xexun2ProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_POSITION = 0x14;
private void sendResponse(Channel channel, int type, int index, ByteBuf imei) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0xfa);
response.writeByte(0xaf);
response.writeShort(type);
response.writeShort(index);
response.writeBytes(imei);
response.writeShort(1); // attributes / length
response.writeShort(0xfffe); // checksum
response.writeByte(1); // response
response.writeByte(0xfa);
response.writeByte(0xaf);
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private String decodeAlarm(long value) {
if (BitUtil.check(value, 0)) {
return Position.ALARM_SOS;
}
if (BitUtil.check(value, 1)) {
return Position.ALARM_REMOVING;
}
if (BitUtil.check(value, 15)) {
return Position.ALARM_FALL_DOWN;
}
return null;
}
private double convertCoordinate(double value) {
double degrees = Math.floor(value / 100);
double minutes = value - degrees * 100;
return degrees + minutes / 60;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // flag
int type = buf.readUnsignedShort();
int index = buf.readUnsignedShort();
ByteBuf imei = buf.readSlice(8);
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, ByteBufUtil.hexDump(imei).substring(0, 15));
if (deviceSession == null) {
return null;
}
sendResponse(channel, type, index, imei);
buf.readUnsignedShort(); // attributes
buf.readUnsignedShort(); // checksum
if (type == MSG_POSITION) {
List<Integer> lengths = new ArrayList<>();
List<Position> positions = new ArrayList<>();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
lengths.add(buf.readUnsignedShort());
}
for (int i = 0; i < count; i++) {
int endIndex = buf.readerIndex() + lengths.get(i);
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_INDEX, buf.readUnsignedByte());
position.setDeviceTime(new Date(buf.readUnsignedInt() * 1000));
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
int battery = buf.readUnsignedShort();
position.set(Position.KEY_CHARGE, BitUtil.check(battery, 15));
position.set(Position.KEY_BATTERY_LEVEL, BitUtil.to(battery, 15));
int mask = buf.readUnsignedByte();
if (BitUtil.check(mask, 0)) {
position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedInt()));
}
if (BitUtil.check(mask, 1)) {
int positionMask = buf.readUnsignedByte();
if (BitUtil.check(positionMask, 0)) {
position.setValid(true);
position.setFixTime(position.getDeviceTime());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.setLongitude(convertCoordinate(buf.readFloat()));
position.setLatitude(convertCoordinate(buf.readFloat()));
}
Network network = new Network();
if (BitUtil.check(positionMask, 1)) {
int wifiCount = buf.readUnsignedByte();
for (int j = 0; j < wifiCount; j++) {
String mac = ByteBufUtil.hexDump(buf.readSlice(6)).replaceAll("(..)", "$1:");
network.addWifiAccessPoint(WifiAccessPoint.from(
mac.substring(0, mac.length() - 1), buf.readUnsignedByte()));
}
}
if (BitUtil.check(positionMask, 2)) {
int cellCount = buf.readUnsignedByte();
for (int j = 0; j < cellCount; j++) {
network.addCellTower(CellTower.from(
buf.readUnsignedShort(), buf.readUnsignedShort(),
buf.readInt(), buf.readUnsignedInt(), buf.readUnsignedByte()));
}
}
if (network.getWifiAccessPoints() != null || network.getCellTowers() != null) {
position.setNetwork(network);
}
if (BitUtil.check(positionMask, 3)) {
buf.skipBytes(12 * buf.readUnsignedByte()); // tof
}
if (BitUtil.check(positionMask, 5)) {
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort() * 0.1));
position.setCourse(buf.readUnsignedShort() * 0.1);
}
if (BitUtil.check(positionMask, 6)) {
position.setValid(true);
position.setFixTime(position.getDeviceTime());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.setLongitude(convertCoordinate(buf.readDouble()));
position.setLatitude(convertCoordinate(buf.readDouble()));
}
if (BitUtil.check(positionMask, 7)) {
buf.skipBytes(2); // length = 30
buf.skipBytes(1); // marker = 'G'
buf.skipBytes(2); // length = 27
position.setLongitude(convertCoordinate(buf.readDouble()));
position.setLatitude(convertCoordinate(buf.readDouble()));
position.setValid(buf.readUnsignedByte()>0); // 0=invalid,1=normal,2=sub-meter,3=differential
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
buf.skipBytes(1); // SNR
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort() * 0.1));
position.setCourse(buf.readUnsignedShort() * 0.1);
position.setAltitude(buf.readFloat());
}
}
if (BitUtil.check(mask, 3)) {
buf.readUnsignedInt(); // fingerprint
}
if (BitUtil.check(mask, 4)) {
buf.skipBytes(20); // version
buf.skipBytes(8); // imsi
buf.skipBytes(10); // iccid
}
if (BitUtil.check(mask, 5)) {
buf.skipBytes(12); // device parameters
}
if (!position.getValid()) {
getLastLocation(position, position.getDeviceTime());
}
positions.add(position);
buf.readerIndex(endIndex);
}
return positions;
}
return null;
}
}
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