/* * Copyright 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.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.DeviceSession; import org.traccar.Protocol; import org.traccar.helper.BitUtil; import org.traccar.model.Position; import java.net.SocketAddress; import java.text.SimpleDateFormat; import java.util.Date; import java.util.LinkedList; import java.util.List; public class TelemaxProtocolDecoder extends BaseProtocolDecoder { public TelemaxProtocolDecoder(Protocol protocol) { super(protocol); } private String readValue(String sentence, int[] index, int length) { String value = sentence.substring(index[0], index[0] + length); index[0] += length; return value; } @Override protected Object decode( Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { String sentence = (String) msg; if (sentence.startsWith("%")) { int length = Integer.parseInt(sentence.substring(1, 3)); getDeviceSession(channel, remoteAddress, sentence.substring(3, 3 + length)); return null; } DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } int[] index = {0}; if (!readValue(sentence, index, 1).equals("Y")) { return null; } readValue(sentence, index, 8); // command id readValue(sentence, index, 6); // password readValue(sentence, index, Integer.parseInt(readValue(sentence, index, 2), 16)); // unit id readValue(sentence, index, 2); // frame count readValue(sentence, index, 2); // data format int interval = Integer.parseInt(readValue(sentence, index, 4), 16); readValue(sentence, index, 2); // info flags readValue(sentence, index, 2); // version int count = Integer.parseInt(readValue(sentence, index, 2), 16); Date time = null; List<Position> positions = new LinkedList<>(); for (int i = 0; i < count; i++) { Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); int speed = Integer.parseInt(readValue(sentence, index, 2), 16); position.setValid(BitUtil.check(speed, 7)); position.setSpeed(BitUtil.to(speed, 7)); position.setLongitude((Integer.parseInt(readValue(sentence, index, 6), 16) - 5400000) / 30000.0); position.setLatitude((Integer.parseInt(readValue(sentence, index, 6), 16) - 5400000) / 30000.0); if (i == 0 | i == count - 1) { time = new SimpleDateFormat("yyMMddHHmmss").parse(readValue(sentence, index, 12)); position.set(Position.KEY_STATUS, readValue(sentence, index, 8)); } else { time = new Date(time.getTime() + interval * 1000); } position.setTime(time); positions.add(position); } return positions; } }