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/*
* Copyright 2017 - 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.session.DeviceSession;
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 Gt30ProtocolDecoder extends BaseProtocolDecoder {
public Gt30ProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.text("$$")
.number("x{4}") // length
.expression("(.{14})") // device id
.number("x{4}") // type
.expression("(.)?") // alarm
.number("(dd)(dd)(dd).(ddd),") // time (hhmmss.sss)
.expression("([AV]),") // validity
.number("(d+)(dd.d+),") // latitude
.expression("([NS]),")
.number("(d+)(dd.d+),") // longitude
.expression("([EW]),")
.number("(d+.d+)?,") // speed
.number("(d+.d+)?,") // course
.number("(dd)(dd)(dd)") // date (ddmmyy)
.expression("[^\\|]*")
.number("|(d+.d+)") // hdop
.number("|(-?d+)") // altitude
.number("x{4}") // checksum
.compile();
private String decodeAlarm(int value) {
return switch (value) {
case 0x01, 0x02, 0x03 -> Position.ALARM_SOS;
case 0x10 -> Position.ALARM_LOW_BATTERY;
case 0x11 -> Position.ALARM_OVERSPEED;
case 0x12 -> Position.ALARM_GEOFENCE;
default -> null;
};
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
Parser parser = new Parser(PATTERN, (String) msg);
if (!parser.matches()) {
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next().trim());
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
if (parser.hasNext()) {
position.set(Position.KEY_ALARM, decodeAlarm(parser.next().charAt(0)));
}
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setValid(parser.next().equals("A"));
position.setLatitude(parser.nextCoordinate());
position.setLongitude(parser.nextCoordinate());
position.setSpeed(parser.nextDouble(0));
position.setCourse(parser.nextDouble(0));
dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setTime(dateBuilder.getDate());
position.set(Position.KEY_HDOP, parser.nextDouble());
position.setAltitude(parser.nextDouble(0));
return position;
}
}
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