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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.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.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class TlvProtocolDecoder extends BaseProtocolDecoder {
public TlvProtocolDecoder(Protocol protocol) {
super(protocol);
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, String type, String... arguments) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeCharSequence(type, StandardCharsets.US_ASCII);
for (String argument : arguments) {
response.writeByte(argument.length());
response.writeCharSequence(argument, StandardCharsets.US_ASCII);
}
response.writeByte(0);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private String readArgument(ByteBuf buf) {
return buf.readSlice(buf.readUnsignedByte()).toString(StandardCharsets.US_ASCII);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
String type = buf.readSlice(2).toString(StandardCharsets.US_ASCII);
if (channel != null) {
switch (type) {
case "0A", "0C" -> sendResponse(channel, remoteAddress, type);
case "0B" -> sendResponse(channel, remoteAddress, type, "1482202689", "10", "20", "15");
case "0E", "0F" -> sendResponse(channel, remoteAddress, type, "30", "Unknown");
}
}
if (type.equals("0E")) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, readArgument(buf));
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setValid(true);
position.setTime(new Date(Long.parseLong(readArgument(buf)) * 1000));
readArgument(buf); // location identifier
position.setLongitude(Double.parseDouble(readArgument(buf)));
position.setLatitude(Double.parseDouble(readArgument(buf)));
position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(readArgument(buf))));
position.setCourse(Double.parseDouble(readArgument(buf)));
position.set(Position.KEY_SATELLITES, Integer.parseInt(readArgument(buf)));
return position;
}
return null;
}
}
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