Java tutorial
/* * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org) * Copyright 2015 Vitaly Litvak (vitavaque@gmail.com) * * 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.BitUtil; import org.traccar.helper.DateBuilder; import org.traccar.model.CellTower; import org.traccar.model.Network; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.charset.StandardCharsets; import java.util.LinkedList; import java.util.List; public class AutoFonProtocolDecoder extends BaseProtocolDecoder { public AutoFonProtocolDecoder(Protocol protocol) { super(protocol); } public static final int MSG_LOGIN = 0x10; public static final int MSG_LOCATION = 0x11; public static final int MSG_HISTORY = 0x12; public static final int MSG_45_LOGIN = 0x41; public static final int MSG_45_LOCATION = 0x02; private static double convertCoordinate(int raw) { int degrees = raw / 1000000; double minutes = (raw % 1000000) / 10000.0; return degrees + minutes / 60; } private static double convertCoordinate(short degrees, int minutes) { double value = degrees + BitUtil.from(minutes, 4) / 600000.0; if (BitUtil.check(minutes, 0)) { return value; } else { return -value; } } private Position decodePosition(DeviceSession deviceSession, ByteBuf buf, boolean history) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); if (!history) { buf.readUnsignedByte(); // interval buf.skipBytes(8); // settings } position.set(Position.KEY_STATUS, buf.readUnsignedByte()); if (!history) { buf.readUnsignedShort(); } position.set(Position.KEY_BATTERY, buf.readUnsignedByte()); buf.skipBytes(6); // time if (!history) { for (int i = 0; i < 2; i++) { buf.skipBytes(5); // time buf.readUnsignedShort(); // interval buf.skipBytes(5); // mode } } position.set(Position.PREFIX_TEMP + 1, buf.readByte()); int rssi = buf.readUnsignedByte(); CellTower cellTower = CellTower.from(buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort(), buf.readUnsignedShort(), rssi); position.setNetwork(new Network(cellTower)); int valid = buf.readUnsignedByte(); position.setValid((valid & 0xc0) != 0); position.set(Position.KEY_SATELLITES, valid & 0x3f); DateBuilder dateBuilder = new DateBuilder() .setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()) .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte()); position.setTime(dateBuilder.getDate()); position.setLatitude(convertCoordinate(buf.readInt())); position.setLongitude(convertCoordinate(buf.readInt())); position.setAltitude(buf.readShort()); position.setSpeed(buf.readUnsignedByte()); position.setCourse(buf.readUnsignedByte() * 2.0); position.set(Position.KEY_HDOP, buf.readUnsignedShort()); buf.readUnsignedShort(); // reserved buf.readUnsignedByte(); // checksum return position; } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; int type = buf.readUnsignedByte(); if (type == MSG_LOGIN || type == MSG_45_LOGIN) { if (type == MSG_LOGIN) { buf.readUnsignedByte(); // hardware version buf.readUnsignedByte(); // software version } String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei); if (deviceSession != null && channel != null) { ByteBuf response = Unpooled.buffer(); response.writeBytes("resp_crc=".getBytes(StandardCharsets.US_ASCII)); response.writeByte(buf.getByte(buf.writerIndex() - 1)); channel.writeAndFlush(new NetworkMessage(response, remoteAddress)); } return null; } DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } if (type == MSG_LOCATION) { return decodePosition(deviceSession, buf, false); } else if (type == MSG_HISTORY) { int count = buf.readUnsignedByte() & 0x0f; buf.readUnsignedShort(); // total count List<Position> positions = new LinkedList<>(); for (int i = 0; i < count; i++) { positions.add(decodePosition(deviceSession, buf, true)); } return positions; } else if (type == MSG_45_LOCATION) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); short status = buf.readUnsignedByte(); if (BitUtil.check(status, 7)) { position.set(Position.KEY_ALARM, Position.ALARM_GENERAL); } position.set(Position.KEY_BATTERY, BitUtil.to(status, 7)); buf.skipBytes(2); // remaining time position.set(Position.PREFIX_TEMP + 1, buf.readByte()); buf.skipBytes(2); // timer (interval and units) buf.readByte(); // mode buf.readByte(); // gprs sending interval buf.skipBytes(6); // mcc, mnc, lac, cid int valid = buf.readUnsignedByte(); position.setValid(BitUtil.from(valid, 6) != 0); position.set(Position.KEY_SATELLITES, BitUtil.from(valid, 6)); int time = buf.readUnsignedMedium(); int date = buf.readUnsignedMedium(); DateBuilder dateBuilder = new DateBuilder().setTime(time / 10000, time / 100 % 100, time % 100) .setDateReverse(date / 10000, date / 100 % 100, date % 100); position.setTime(dateBuilder.getDate()); position.setLatitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium())); position.setLongitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium())); position.setSpeed(buf.readUnsignedByte()); position.setCourse(buf.readUnsignedShort()); return position; } return null; } }