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/*
* Copyright 2013 - 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.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.regex.Pattern;
public class YwtProtocolDecoder extends BaseProtocolDecoder {
public YwtProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.expression("%(..),") // type
.number("(d+):") // unit identifier
.number("d+,") // subtype
.number("(dd)(dd)(dd)") // date (yymmdd)
.number("(dd)(dd)(dd),") // time (hhmmss)
.expression("([EW])")
.number("(ddd.d{6}),") // longitude
.expression("([NS])")
.number("(dd.d{6}),") // latitude
.number("(d+)?,") // altitude
.number("(d+),") // speed
.number("(d+),") // course
.number("(d+),") // satellite
.expression("([^,]+),") // report identifier
.expression("([-0-9a-fA-F]+)") // status
.any()
.compile();
@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.writeAndFlush(new NetworkMessage("%AT+SN=" + sentence.substring(start, end), remoteAddress));
return null;
}
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
Position position = new Position(getProtocolName());
String type = parser.next();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(parser.nextDateTime());
position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG));
position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG));
position.setAltitude(parser.nextDouble(0));
position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble()));
position.setCourse(parser.nextDouble());
int satellites = parser.nextInt();
position.setValid(satellites != 0);
position.set(Position.KEY_SATELLITES, satellites);
String reportId = parser.next();
position.set(Position.KEY_STATUS, parser.next());
// Send response
if ((type.equals("KP") || type.equals("EP")) && channel != null) {
channel.writeAndFlush(new NetworkMessage("%AT+" + type + "=" + reportId + "\r\n", remoteAddress));
}
return position;
}
}
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