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/*
* Copyright 2019 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.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
public class PstProtocolDecoder extends BaseProtocolDecoder {
public PstProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_STATUS = 0x05;
private Date readDate(ByteBuf buf) {
long value = buf.readUnsignedInt();
return new DateBuilder()
.setYear((int) BitUtil.between(value, 26, 32))
.setMonth((int) BitUtil.between(value, 22, 26))
.setDay((int) BitUtil.between(value, 17, 22))
.setHour((int) BitUtil.between(value, 12, 17))
.setMinute((int) BitUtil.between(value, 6, 12))
.setSecond((int) BitUtil.between(value, 0, 6)).getDate();
}
private double readCoordinate(ByteBuf buf) {
long value = buf.readUnsignedInt();
int sign = BitUtil.check(value, 31) ? -1 : 1;
value = BitUtil.to(value, 31);
return sign * (BitUtil.from(value, 16) + BitUtil.to(value, 16) / 10000.0) / 60;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
String id = String.valueOf(buf.readUnsignedInt());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
buf.readUnsignedByte(); // version
buf.readUnsignedInt(); // index
int type = buf.readUnsignedByte();
if (type == MSG_STATUS) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setDeviceTime(readDate(buf));
buf.readUnsignedByte();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
int tag = buf.readUnsignedByte();
int length = buf.readUnsignedByte();
switch (tag) {
case 0x0D:
int battery = buf.readUnsignedByte();
if (battery <= 20) {
position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte() * 5);
}
break;
case 0x10:
position.setFixTime(readDate(buf));
position.setLatitude(readCoordinate(buf));
position.setLongitude(readCoordinate(buf));
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedByte() * 2);
position.setAltitude(buf.readShort());
buf.readUnsignedInt(); // gps condition
break;
default:
buf.skipBytes(length);
break;
}
}
return position.getFixTime() != null ? position : null;
}
return null;
}
}
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