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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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class PebbellProtocolDecoder extends BaseProtocolDecoder {
public PebbellProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_DATA = 0x01;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
buf.readUnsignedByte(); // properties
buf.readUnsignedShortLE(); // length
buf.readUnsignedShortLE(); // checksum
buf.readUnsignedShortLE(); // index
int type = buf.readUnsignedByte();
if (type == MSG_DATA) {
Position position = new Position(getProtocolName());
while (buf.isReadable()) {
int endIndex = buf.readUnsignedByte() + buf.readerIndex();
int key = buf.readUnsignedByte();
switch (key) {
case 0x01:
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII));
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
break;
case 0x20:
position.setLatitude(buf.readIntLE() * 0.0000001);
position.setLongitude(buf.readIntLE() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE()));
position.setCourse(buf.readUnsignedShortLE());
position.setAltitude(buf.readShortLE());
position.setValid(buf.readUnsignedShortLE() > 0);
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
break;
default:
break;
}
buf.readerIndex(endIndex);
}
if (!position.getAttributes().containsKey(Position.KEY_SATELLITES)) {
getLastLocation(position, null);
}
return position.getDeviceId() > 0 ? position : null;
}
return null;
}
}
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