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/*
* Copyright 2020 - 2021 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.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import org.traccar.protobuf.dolphin.Messages.DolphinMessages;
import java.net.SocketAddress;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class DolphinProtocolDecoder extends BaseProtocolDecoder {
public DolphinProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedShort(); // header
int index = (int) buf.readUnsignedIntLE();
buf.readUnsignedShort(); // version
buf.readUnsignedShort(); // flags
int type = buf.readUnsignedShortLE();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(buf.readLongLE()));
if (deviceSession == null) {
return null;
}
int length = (int) buf.readUnsignedIntLE();
buf.readUnsignedInt(); // reserved
if (type == DolphinMessages.MessageType.DataPack_Request.getNumber()) {
DolphinMessages.DataPackRequest message = DolphinMessages.DataPackRequest.parseFrom(
ByteBufUtil.getBytes(buf, buf.readerIndex(), length, false));
if (channel != null) {
byte[] responseData = DolphinMessages.DataPackResponse.newBuilder()
.setResponse(DolphinMessages.DataPackResponseCode.DataPack_OK)
.build()
.toByteArray();
ByteBuf response = Unpooled.buffer();
response.writeShort(0xABAB); // header
response.writeIntLE(index);
response.writeShort(0); // flags
response.writeShortLE(DolphinMessages.MessageType.DataPack_Response.getNumber());
response.writeIntLE(responseData.length);
response.writeIntLE(0); // reserved
response.writeBytes(responseData);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
List<Position> positions = new LinkedList<>();
for (int i = 0; i < message.getPointsCount(); i++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DolphinMessages.DataPoint point = message.getPoints(i);
position.setValid(true);
position.setTime(new Date(point.getTimestamp() * 1000L));
position.setLatitude(point.getLatitude());
position.setLongitude(point.getLongitude());
position.setAltitude(point.getAltitude());
position.setSpeed(UnitsConverter.knotsFromKph(point.getSpeed()));
position.setCourse(point.getBearing());
position.set(Position.KEY_SATELLITES, point.getSatellites());
position.set(Position.KEY_HDOP, point.getHDOP());
positions.add(position);
}
return positions;
}
return null;
}
}
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