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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.net.SocketAddress;
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.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class YwtProtocolDecoder extends BaseProtocolDecoder {
public YwtProtocolDecoder(YwtProtocol protocol) {
super(protocol);
}
private static final Pattern pattern = Pattern.compile(
"%(..)," + // Type
"(\\d+):" + // Unit identifier
"\\d+," + // Subtype
"(\\d{2})(\\d{2})(\\d{2})" + // Date (YYMMDD)
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"([EW])" +
"(\\d{3}\\.\\d{6})," + // Longitude (DDDMM.MMMM)
"([NS])" +
"(\\d{2}\\.\\d{6})," + // Latitude (DDMM.MMMM)
"(\\d+)?," + // Altitude
"(\\d+)," + // Speed
"(\\d+)," + // Course
"(\\d+)," + // Satellite
"([^,]+)," + // Report identifier
"([0-9a-fA-F\\-]+)" + // Status
".*");
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
String sentence = (String) msg;
// Synchronization
if (sentence.startsWith("%SN") && channel != null) {
int start = sentence.indexOf(':');
int end = start;
for (int i = 0; i < 4; i++) {
end = sentence.indexOf(',', end + 1);
}
if (end == -1) {
end = sentence.length();
}
channel.write("%AT+SN=" + sentence.substring(start, end));
return null;
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
Integer index = 1;
String type = parser.group(index++);
// Device
if (!identify(parser.group(index++), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + Integer.parseInt(parser.group(index++)));
time.set(Calendar.MONTH, Integer.parseInt(parser.group(index++)) - 1);
time.set(Calendar.DAY_OF_MONTH, Integer.parseInt(parser.group(index++)));
time.set(Calendar.HOUR_OF_DAY, Integer.parseInt(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.parseInt(parser.group(index++)));
time.set(Calendar.SECOND, Integer.parseInt(parser.group(index++)));
position.setTime(time.getTime());
// Longitude
String hemisphere = parser.group(index++);
Double longitude = Double.parseDouble(parser.group(index++));
if (hemisphere.compareTo("W") == 0) longitude = -longitude;
position.setLongitude(longitude);
// Latitude
hemisphere = parser.group(index++);
Double latitude = Double.parseDouble(parser.group(index++));
if (hemisphere.compareTo("S") == 0) latitude = -latitude;
position.setLatitude(latitude);
// Altitude
String altitude = parser.group(index++);
if (altitude != null) {
position.setAltitude(Double.parseDouble(altitude));
}
// Speed
position.setSpeed(Double.parseDouble(parser.group(index++)));
// Course
position.setCourse(Double.parseDouble(parser.group(index++)));
// Satellites
int satellites = Integer.parseInt(parser.group(index++));
position.setValid(satellites >= 3);
position.set(Event.KEY_SATELLITES, satellites);
// Report identifier
String reportId = parser.group(index++);
// Status
position.set(Event.KEY_STATUS, parser.group(index++));
// Send response
if (type.equals("KP") || type.equals("EP") || type.equals("EP")) {
if (channel != null) {
channel.write("%AT+" + type + "=" + reportId + "\r\n");
}
}
return position;
}
}
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