/* * 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, 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(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; } }