Java tutorial
/* * 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_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); 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)); 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)); 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 (buf.readableBytes() >= 2) { position.set(Position.KEY_POWER, BcdUtil.readInteger(buf, 4) * 0.01); } sendResponse(channel, header, type, index, imei, alarm); return position; } }