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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 java.util.Calendar;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Crc;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class LaipacProtocolDecoder extends BaseProtocolDecoder {
public LaipacProtocolDecoder(String protocol) {
super(protocol);
}
private static final Pattern pattern = Pattern.compile(
"\\$AVRMC," +
"([^,]+)," + // Identifier
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"([AVRavr])," + // Validity
"(\\d{2})(\\d{2}\\.\\d+)," + // Latitude (DDMM.MMMM)
"([NS])," +
"(\\d{3})(\\d{2}\\.\\d+)," + // Longitude (DDDMM.MMMM)
"([EW])," +
"(\\d+\\.\\d+)," + // Speed
"(\\d+\\.\\d+)," + // Course
"(\\d{2})(\\d{2})(\\d{2})," + // Date (DDMMYY)
"(.)," + // Type
"[^\\*]+\\*" +
"(\\p{XDigit}{2})"); // Checksum
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
// Heartbeat
if (sentence.startsWith("$ECHK") && channel != null) {
channel.write(sentence + "\r\n");
return null;
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setProtocol(getProtocol());
Integer index = 1;
// Identification
if (!identify(parser.group(index++))) {
return null;
}
position.setDeviceId(getDeviceId());
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
// Validity
String status = parser.group(index++);
position.setValid(status.compareToIgnoreCase("A") == 0);
// Latitude
Double latitude = Double.valueOf(parser.group(index++));
latitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("S") == 0) latitude = -latitude;
position.setLatitude(latitude);
// Longitude
Double longitude = Double.valueOf(parser.group(index++));
longitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) longitude = -longitude;
position.setLongitude(longitude);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
// Date
time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
position.setTime(time.getTime());
// Response
String type = parser.group(index++);
String checksum = parser.group(index++);
String response = null;
if (type.equals("0") && Character.isLowerCase(status.charAt(0))) {
response = "$EAVACK,0," + checksum;
response += Crc.nmeaChecksum(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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