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/*
* Copyright 2013 - 2014 Anton Tananaev (anton.tananaev@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 org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Checksum;
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 LaipacProtocolDecoder extends BaseProtocolDecoder {
public LaipacProtocolDecoder(LaipacProtocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.text("$AVRMC,")
.expression("([^,]+),") // identifier
.number("(dd)(dd)(dd),") // time
.expression("([AVRavr]),") // validity
.number("(dd)(dd.d+),") // latitude
.expression("([NS]),")
.number("(ddd)(dd.d+),") // longitude
.number("([EW]),")
.number("(d+.d+),") // speed
.number("(d+.d+),") // course
.number("(dd)(dd)(dd),") // date (ddmmyy)
.expression("(.),") // type
.expression("[^*]+").text("*")
.number("(xx)") // checksum
.compile();
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
String sentence = (String) msg;
if (sentence.startsWith("$ECHK") && channel != null) {
channel.write(sentence + "\r\n"); // heartbeat
return null;
}
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
Position position = new Position();
position.setProtocol(getProtocolName());
if (!identify(parser.next(), channel, remoteAddress)) {
return null;
}
position.setDeviceId(getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(), parser.nextInt(), parser.nextInt());
String status = parser.next();
position.setValid(status.toUpperCase().equals("A"));
position.setLatitude(parser.nextCoordinate());
position.setLongitude(parser.nextCoordinate());
position.setSpeed(parser.nextDouble());
position.setCourse(parser.nextDouble());
dateBuilder.setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt());
position.setTime(dateBuilder.getDate());
String type = parser.next();
String checksum = parser.next();
String response = null;
if (type.equals("0") && Character.isLowerCase(status.charAt(0))) {
response = "$EAVACK,0," + checksum;
response += Checksum.nmea(response);
} else if (type.equals("S") || type.equals("T")) {
response = "$AVCFG,00000000,t*21";
} else if (type.equals("3")) {
response = "$AVCFG,00000000,d*31";
} else if (type.equals("X") || type.equals("4")) {
response = "$AVCFG,00000000,x*2D";
}
if (response != null && channel != null) {
channel.write(response + "\r\n");
}
return position;
}
}
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