Java tutorial
/* * Copyright 2012 - 2018 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.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.helper.Parser; import org.traccar.helper.PatternBuilder; 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.regex.Pattern; public class UproProtocolDecoder extends BaseProtocolDecoder { public UproProtocolDecoder(Protocol protocol) { super(protocol); } private static final Pattern PATTERN_HEADER = new PatternBuilder().text("*").expression("(..20)") // head .expression("([01])") // ack .number("(d+),") // device id .expression("(.)") // type .expression("(.)") // subtype .any().compile(); private static final Pattern PATTERN_LOCATION = new PatternBuilder().number("(dd)(dd)(dd)") // time (hhmmss) .number("(dd)(dd)(dddd)") // latitude .number("(ddd)(dd)(dddd)") // longitude .number("(d)") // flags .number("(dd)") // speed .number("(dd)") // course .number("(dd)(dd)(dd)") // date (ddmmyy) .compile(); private void decodeLocation(Position position, String data) { Parser parser = new Parser(PATTERN_LOCATION, data); if (parser.matches()) { DateBuilder dateBuilder = new DateBuilder().setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0)); position.setValid(true); position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_MIN_MIN)); position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_MIN_MIN)); int flags = parser.nextInt(0); position.setValid(BitUtil.check(flags, 0)); if (!BitUtil.check(flags, 1)) { position.setLatitude(-position.getLatitude()); } if (!BitUtil.check(flags, 2)) { position.setLongitude(-position.getLongitude()); } position.setSpeed(parser.nextInt(0) * 2); position.setCourse(parser.nextInt(0) * 10); dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0)); position.setTime(dateBuilder.getDate()); } } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; if (buf.getByte(buf.readerIndex()) != '*') { return null; } int headerIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '&'); if (headerIndex < 0) { headerIndex = buf.writerIndex(); } String header = buf.readSlice(headerIndex - buf.readerIndex()).toString(StandardCharsets.US_ASCII); Parser parser = new Parser(PATTERN_HEADER, header); if (!parser.matches()) { return null; } String head = parser.next(); boolean reply = parser.next().equals("1"); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next()); if (deviceSession == null) { return null; } Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); String type = parser.next(); String subtype = parser.next(); if (reply && channel != null) { channel.writeAndFlush(new NetworkMessage("*" + head + "Y" + type + subtype + "#", remoteAddress)); } while (buf.isReadable()) { buf.readByte(); // skip delimiter byte dataType = buf.readByte(); int delimiterIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '&'); if (delimiterIndex < 0) { delimiterIndex = buf.writerIndex(); } ByteBuf data = buf.readSlice(delimiterIndex - buf.readerIndex()); switch (dataType) { case 'A': decodeLocation(position, data.toString(StandardCharsets.US_ASCII)); break; case 'B': position.set(Position.KEY_STATUS, data.toString(StandardCharsets.US_ASCII)); break; case 'C': long odometer = 0; while (data.isReadable()) { odometer <<= 4; odometer += data.readByte() - (byte) '0'; } position.set(Position.KEY_ODOMETER, odometer * 2 * 1852 / 3600); break; case 'F': position.setSpeed(Integer.parseInt(data.readSlice(4).toString(StandardCharsets.US_ASCII)) * 0.1); break; case 'K': position.set("statusExtended", data.toString(StandardCharsets.US_ASCII)); break; case 'P': if (data.readableBytes() >= 16) { position.setNetwork(new Network( CellTower.from(Integer.parseInt(data.readSlice(4).toString(StandardCharsets.US_ASCII)), Integer.parseInt(data.readSlice(4).toString(StandardCharsets.US_ASCII)), Integer.parseInt(data.readSlice(4).toString(StandardCharsets.US_ASCII), 16), Integer.parseInt(data.readSlice(4).toString(StandardCharsets.US_ASCII), 16)))); } break; case 'Q': position.set("obdPid", ByteBufUtil.hexDump(data)); break; case 'R': if (head.startsWith("HQ")) { position.set(Position.KEY_RSSI, Integer.parseInt(data.readSlice(2).toString(StandardCharsets.US_ASCII))); position.set(Position.KEY_SATELLITES, Integer.parseInt(data.readSlice(2).toString(StandardCharsets.US_ASCII))); } else { position.set("odbTravel", ByteBufUtil.hexDump(data)); } break; case 'S': position.set("obdTraffic", ByteBufUtil.hexDump(data)); break; case 'T': position.set(Position.KEY_BATTERY_LEVEL, Integer.parseInt(data.readSlice(2).toString(StandardCharsets.US_ASCII))); break; case 'V': position.set(Position.KEY_POWER, Integer.parseInt(data.readSlice(4).toString(StandardCharsets.US_ASCII)) * 0.1); break; default: break; } } if (position.getLatitude() != 0 && position.getLongitude() != 0) { return position; } return null; } }