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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 com.google.protobuf.InvalidProtocolBufferException;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
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 org.traccar.protobuf.OmnicommMessageOuterClass;
import java.net.SocketAddress;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class OmnicommProtocolDecoder extends BaseProtocolDecoder {
public OmnicommProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_IDENTIFICATION = 0x80;
public static final int MSG_CONTAINER_IM = 0x86;
private OmnicommMessageOuterClass.OmnicommMessage parseProto(
ByteBuf buf, int length) throws InvalidProtocolBufferException {
final byte[] array;
final int offset;
if (buf.hasArray()) {
array = buf.array();
offset = buf.arrayOffset() + buf.readerIndex();
} else {
array = ByteBufUtil.getBytes(buf, buf.readerIndex(), length, false);
offset = 0;
}
buf.skipBytes(length);
return OmnicommMessageOuterClass.OmnicommMessage
.getDefaultInstance().getParserForType().parseFrom(array, offset, length);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // prefix
int type = buf.readUnsignedByte();
buf.readUnsignedShortLE(); // length
if (type == MSG_IDENTIFICATION) {
getDeviceSession(channel, remoteAddress, String.valueOf(buf.readUnsignedIntLE()));
} else if (type == MSG_CONTAINER_IM) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
buf.readUnsignedIntLE(); // record number
buf.readUnsignedIntLE(); // time
buf.readUnsignedByte(); // priority
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() > 2) {
OmnicommMessageOuterClass.OmnicommMessage message = parseProto(buf, buf.readUnsignedShortLE());
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
if (message.hasNAV()) {
OmnicommMessageOuterClass.OmnicommMessage.NAV nav = message.getNAV();
position.setValid(true);
position.setTime(new Date((nav.getGPSTime() + 1230768000) * 1000L)); // from 2009-01-01 12:00
position.setLatitude(nav.getLAT() * 0.0000001);
position.setLongitude(nav.getLON() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromKph(nav.getGPSVel() * 0.1));
position.setCourse(nav.getGPSDir());
position.setAltitude(nav.getGPSAlt() * 0.1);
position.set(Position.KEY_SATELLITES, nav.getGPSNSat());
}
positions.add(position);
}
return positions;
}
return null;
}
}
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