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/*
* Copyright 2023 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.buffer.ByteBuf;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import org.traccar.session.DeviceSession;
import java.net.SocketAddress;
import java.util.Date;
public class PositrexProtocolDecoder extends BaseProtocolDecoder {
public PositrexProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_PING = 0x2E;
private Date readTime(ByteBuf buf) {
long time = buf.readUnsignedInt();
DateBuilder dateBuilder = new DateBuilder();
dateBuilder.setSecond((int) (time % 60));
time /= 60;
dateBuilder.setMinute((int) (time % 60));
time /= 60;
dateBuilder.setHour((int) (time % 24));
time /= 24;
dateBuilder.setDay((int) (time % 32));
time /= 32;
dateBuilder.setMonth((int) (time % 13));
dateBuilder.setYear((int) (2000 + time / 13));
return dateBuilder.getDate();
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int first = buf.getUnsignedByte(buf.readerIndex());
int second = buf.getUnsignedByte(buf.readerIndex() + 1);
long deviceId;
if (BitUtil.check(first, 7)) {
if (BitUtil.check(first, 6)) {
deviceId = 73000000 + BitUtil.to(buf.readUnsignedInt(), 30);
} else if (second == 0) {
deviceId = 7590000 + BitUtil.to(buf.readUnsignedMedium(), 20);
} else {
deviceId = 70000000 + BitUtil.to(buf.readUnsignedMedium(), 20);
}
} else {
deviceId = 7560000 + buf.readUnsignedShort();
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceId));
if (deviceSession == null) {
return null;
}
int service = buf.readUnsignedByte();
if (service == MSG_PING) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(readTime(buf));
int latitude = buf.readMedium();
int longitude = buf.readMedium();
position.setValid(BitUtil.check(latitude, 23));
position.setLatitude(BitUtil.to(latitude, 23) * 0.000025);
position.setLongitude(longitude * 0.000025);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedByte() * 2);
return position;
}
return null;
}
}
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