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/*
* Copyright 2014 - 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.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.regex.Pattern;
public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
public TrackboxProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.number("(dd)(dd)(dd).(ddd),") // time (hhmmss.sss)
.number("(dd)(dd.dddd)([NS]),") // latitude
.number("(ddd)(dd.dddd)([EW]),") // longitude
.number("(d+.d),") // hdop
.number("(-?d+.?d*),") // altitude
.number("(d),") // fix type
.number("(d+.d+),") // course
.number("d+.d+,") // speed (kph)
.number("(d+.d+),") // speed (knots)
.number("(dd)(dd)(dd),") // date (ddmmyy)
.number("(d+)") // satellites
.compile();
private void sendResponse(Channel channel, SocketAddress remoteAddress) {
if (channel != null) {
channel.writeAndFlush(new NetworkMessage("=OK=\r\n", remoteAddress));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
String sentence = (String) msg;
if (sentence.startsWith("a=connect")) {
String id = sentence.substring(sentence.indexOf("i=") + 2);
if (getDeviceSession(channel, remoteAddress, id) != null) {
sendResponse(channel, remoteAddress);
}
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
sendResponse(channel, remoteAddress);
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setLatitude(parser.nextCoordinate());
position.setLongitude(parser.nextCoordinate());
position.set(Position.KEY_HDOP, parser.nextDouble());
position.setAltitude(parser.nextDouble(0));
int fix = parser.nextInt(0);
position.set(Position.KEY_GPS, fix);
position.setValid(fix > 0);
position.setCourse(parser.nextDouble(0));
position.setSpeed(parser.nextDouble(0));
dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setTime(dateBuilder.getDate());
position.set(Position.KEY_SATELLITES, parser.nextInt());
return position;
}
}
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