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/*
* Copyright 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.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class Dsf22ProtocolDecoder extends BaseProtocolDecoder {
public Dsf22ProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
String id = ByteBufUtil.hexDump(buf.readSlice(2));
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setValid(true);
position.setLatitude(buf.readInt());
position.setLongitude(buf.readInt());
position.setTime(new Date(946684800000L + buf.readUnsignedInt()));
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.set(Position.KEY_FUEL_LEVEL, buf.readUnsignedShort() * 0.001);
int status = buf.readUnsignedByte();
position.set(Position.KEY_IGNITION, BitUtil.check(status, 0));
position.set(Position.PREFIX_IN + 1, BitUtil.check(status, 1));
position.set(Position.PREFIX_OUT + 1, BitUtil.check(status, 4));
position.set(Position.KEY_ALARM, BitUtil.check(status, 6) ? Position.ALARM_JAMMING : null);
position.set(Position.KEY_STATUS, status);
positions.add(position);
}
if (channel != null) {
byte[] response = {0x01};
channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(response), remoteAddress));
}
return positions;
}
}
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