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/*
* Copyright 2020 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.Protocol;
import org.traccar.helper.BitUtil;
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 NetProtocolDecoder extends BaseProtocolDecoder {
public NetProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.text("@L")
.number("ddd")
.number("(d{15})") // imei
.number("xx")
.number("(dd)(dd)(dd)") // date (ddmmyy)
.number("(dd)(dd)(dd)") // time (hhmmss)
.number("(x)") // flags
.number("(dd)(dd)(dddd)") // latitude
.number("(ddd)(dd)(dddd)") // longitude
.number("(x{8})") // status
.number("(x{4})") // speed
.number("(x{6})") // odometer
.number("(xxx)") // course
.number("(xxx)") // alarm
.any()
.compile();
@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());
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(parser.nextDateTime(Parser.DateTimeFormat.DMY_HMS));
int flags = parser.nextHexInt();
position.setValid(BitUtil.check(flags, 3));
int hemisphereLatitude = BitUtil.check(flags, 1) ? -1 : 1;
int hemisphereLongitude = BitUtil.check(flags, 0) ? -1 : 1;
position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_MIN_MIN) * hemisphereLatitude);
position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_MIN_MIN) * hemisphereLongitude);
position.set(Position.KEY_STATUS, parser.nextHexLong());
position.setSpeed(parser.nextHexInt() * 0.01);
position.set(Position.KEY_ODOMETER, parser.nextHexInt() * 1852.0 / 16);
position.setCourse(parser.nextHexInt());
parser.nextHexInt(); // alarm
return position;
}
}
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