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.Checksum; import org.traccar.helper.DateBuilder; import org.traccar.helper.UnitsConverter; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.charset.StandardCharsets; import java.util.LinkedList; import java.util.List; public class HuabaoProtocolDecoder extends BaseProtocolDecoder { public HuabaoProtocolDecoder(Protocol protocol) { super(protocol); } public static final int MSG_GENERAL_RESPONSE = 0x8001; public static final int MSG_TERMINAL_REGISTER = 0x0100; public static final int MSG_TERMINAL_REGISTER_RESPONSE = 0x8100; public static final int MSG_TERMINAL_CONTROL = 0x8105; public static final int MSG_TERMINAL_AUTH = 0x0102; public static final int MSG_LOCATION_REPORT = 0x0200; public static final int MSG_LOCATION_BATCH = 0x0704; public static final int MSG_OIL_CONTROL = 0XA006; public static final int RESULT_SUCCESS = 0; public static ByteBuf formatMessage(int type, ByteBuf id, ByteBuf data) { ByteBuf buf = Unpooled.buffer(); buf.writeByte(0x7e); buf.writeShort(type); buf.writeShort(data.readableBytes()); buf.writeBytes(id); buf.writeShort(1); // index buf.writeBytes(data); data.release(); buf.writeByte(Checksum.xor(buf.nioBuffer(1, buf.readableBytes() - 1))); buf.writeByte(0x7e); return buf; } private void sendGeneralResponse(Channel channel, SocketAddress remoteAddress, ByteBuf id, int type, int index) { if (channel != null) { ByteBuf response = Unpooled.buffer(); response.writeShort(index); response.writeShort(type); response.writeByte(RESULT_SUCCESS); channel.writeAndFlush( new NetworkMessage(formatMessage(MSG_GENERAL_RESPONSE, id, response), remoteAddress)); } } private String decodeAlarm(long value) { if (BitUtil.check(value, 0)) { return Position.ALARM_SOS; } if (BitUtil.check(value, 1)) { return Position.ALARM_OVERSPEED; } if (BitUtil.check(value, 5)) { return Position.ALARM_GPS_ANTENNA_CUT; } if (BitUtil.check(value, 4) || BitUtil.check(value, 9) || BitUtil.check(value, 10) || BitUtil.check(value, 11)) { return Position.ALARM_FAULT; } if (BitUtil.check(value, 8)) { return Position.ALARM_POWER_OFF; } if (BitUtil.check(value, 20)) { return Position.ALARM_GEOFENCE; } if (BitUtil.check(value, 29)) { return Position.ALARM_ACCIDENT; } return null; } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; buf.readUnsignedByte(); // start marker int type = buf.readUnsignedShort(); buf.readUnsignedShort(); // body length ByteBuf id = buf.readSlice(6); // phone number int index = buf.readUnsignedShort(); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, ByteBufUtil.hexDump(id)); if (deviceSession == null) { return null; } if (deviceSession.getTimeZone() == null) { deviceSession.setTimeZone(getTimeZone(deviceSession.getDeviceId(), "GMT+8")); } if (type == MSG_TERMINAL_REGISTER) { if (channel != null) { ByteBuf response = Unpooled.buffer(); response.writeShort(index); response.writeByte(RESULT_SUCCESS); response.writeBytes("authentication".getBytes(StandardCharsets.US_ASCII)); channel.writeAndFlush(new NetworkMessage( formatMessage(MSG_TERMINAL_REGISTER_RESPONSE, id, response), remoteAddress)); } } else if (type == MSG_TERMINAL_AUTH) { sendGeneralResponse(channel, remoteAddress, id, type, index); } else if (type == MSG_LOCATION_REPORT) { return decodeLocation(deviceSession, buf); } else if (type == MSG_LOCATION_BATCH) { return decodeLocationBatch(deviceSession, buf); } return null; } private Position decodeLocation(DeviceSession deviceSession, ByteBuf buf) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedInt())); int flags = buf.readInt(); position.set(Position.KEY_IGNITION, BitUtil.check(flags, 0)); position.setValid(BitUtil.check(flags, 1)); double lat = buf.readUnsignedInt() * 0.000001; double lon = buf.readUnsignedInt() * 0.000001; if (BitUtil.check(flags, 2)) { position.setLatitude(-lat); } else { position.setLatitude(lat); } if (BitUtil.check(flags, 3)) { position.setLongitude(-lon); } else { position.setLongitude(lon); } position.setAltitude(buf.readShort()); position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort() * 0.1)); position.setCourse(buf.readUnsignedShort()); DateBuilder dateBuilder = new DateBuilder(deviceSession.getTimeZone()).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)); position.setTime(dateBuilder.getDate()); while (buf.readableBytes() > 2) { int subtype = buf.readUnsignedByte(); int length = buf.readUnsignedByte(); switch (subtype) { case 0x01: position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 100); break; case 0x30: position.set(Position.KEY_RSSI, buf.readUnsignedByte()); break; case 0x31: position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); break; default: buf.skipBytes(length); break; } } return position; } private List<Position> decodeLocationBatch(DeviceSession deviceSession, ByteBuf buf) { List<Position> positions = new LinkedList<>(); int count = buf.readUnsignedShort(); buf.readUnsignedByte(); // location type for (int i = 0; i < count; i++) { int endIndex = buf.readUnsignedShort() + buf.readerIndex(); positions.add(decodeLocation(deviceSession, buf)); buf.readerIndex(endIndex); } return positions; } }