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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.ByteBufUtil;
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.BcdUtil;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class VnetProtocolDecoder extends BaseProtocolDecoder {
public VnetProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN = 0x0000;
public static final int MSG_LBS = 0x32;
public static final int MSG_GPS = 0x33;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int type = BitUtil.to(buf.readUnsignedShortLE(), 15);
buf.readUnsignedShortLE(); // length
DateBuilder dateBuilder = new DateBuilder()
.setDateReverse(BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2))
.setTime(BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
if (type == MSG_LOGIN) {
String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(0, 15);
getDeviceSession(channel, remoteAddress, imei);
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(
buf.retainedSlice(0, buf.writerIndex()), channel.remoteAddress()));
}
} else if (type == MSG_GPS) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(dateBuilder.getDate());
int value;
int degrees;
value = BcdUtil.readInteger(buf, 8);
degrees = value / 1000000;
double lat = degrees + value % 1000000 * 0.0001 / 60;
value = BcdUtil.readInteger(buf, 10);
degrees = value / 10000000;
double lon = degrees + value % 10000000 * 0.00001 / 60;
int flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 0));
position.setLatitude(BitUtil.check(flags, 1) ? lat : -lat);
position.setLongitude(BitUtil.check(flags, 2) ? lon : -lon);
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
position.setCourse(buf.readUnsignedByte() * 2);
return position;
}
return null;
}
}
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