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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.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.BitUtil;
import org.traccar.helper.Checksum;
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 SatsolProtocolDecoder extends BaseProtocolDecoder {
public SatsolProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedShortLE(); // checksum
buf.readUnsignedShortLE(); // preamble
long id = buf.readUnsignedIntLE();
buf.readUnsignedShortLE(); // length
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(id));
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.isReadable()) {
buf.readUnsignedShortLE(); // checksum
buf.readUnsignedShortLE(); // checksum
buf.readUnsignedShortLE(); // type
int length = buf.readUnsignedShortLE();
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
position.setLatitude(buf.readUnsignedIntLE() * 0.000001);
position.setLongitude(buf.readUnsignedIntLE() * 0.000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE() * 0.01));
position.setAltitude(buf.readShortLE());
position.setCourse(buf.readUnsignedShortLE());
position.setValid(buf.readUnsignedByte() > 0);
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
if (BitUtil.check(buf.readUnsignedByte(), 0)) {
position.set(Position.KEY_ARCHIVE, true);
}
positions.add(position);
buf.skipBytes(length);
}
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShortLE(0);
response.writeShortLE(0x4CBF); // preamble
response.writeIntLE((int) id);
response.writeShortLE(0);
response.setShortLE(0, Checksum.crc16(
Checksum.CRC16_CCITT_FALSE, response.nioBuffer(2, response.readableBytes() - 2)));
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return positions;
}
}
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