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/*
* Copyright 2018 - 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.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class RetranslatorProtocolDecoder extends BaseProtocolDecoder {
public RetranslatorProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(new byte[]{0x11}), remoteAddress));
}
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedInt(); // length
int idLength = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
String id = buf.readCharSequence(idLength, StandardCharsets.US_ASCII).toString();
buf.readByte();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedInt() * 1000));
buf.readUnsignedInt(); // bit flags
while (buf.isReadable()) {
buf.readUnsignedShort(); // block type
int blockEnd = buf.readInt() + buf.readerIndex();
buf.readUnsignedByte(); // security attribute
int dataType = buf.readUnsignedByte();
int nameLength = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
String name = buf.readCharSequence(nameLength, StandardCharsets.US_ASCII).toString();
buf.readByte();
if (name.equals("posinfo")) {
position.setValid(true);
position.setLongitude(buf.readDoubleLE());
position.setLatitude(buf.readDoubleLE());
position.setAltitude(buf.readDoubleLE());
position.setSpeed(buf.readShort());
position.setCourse(buf.readShort());
position.set(Position.KEY_SATELLITES, buf.readByte());
} else {
switch (dataType) {
case 1 -> {
int len = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
position.set(name, buf.readCharSequence(len, StandardCharsets.US_ASCII).toString());
buf.readByte();
}
case 3 -> position.set(name, buf.readInt());
case 4 -> position.set(name, buf.readDoubleLE());
case 5 -> position.set(name, buf.readLong());
}
}
buf.readerIndex(blockEnd);
}
if (position.getLatitude() == 0 && position.getLongitude() == 0) {
getLastLocation(position, position.getDeviceTime());
}
return position;
}
}
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