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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.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.DateBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Calendar;
public class UuxProtocolDecoder extends BaseProtocolDecoder {
public UuxProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_GENERAL = 0x90;
public static final int MSG_IMMOBILIZER = 0x9E;
public static final int MSG_ACK = 0xD0;
public static final int MSG_NACK = 0xF0;
public static final int MSG_KEEPALIVE = 0xFF;
private void sendResponse(Channel channel, int productCode, int protocolVersion, int type) {
if (channel != null && BitUtil.check(protocolVersion, 7)) {
ByteBuf response = Unpooled.buffer();
response.writeShort(productCode);
response.writeByte(BitUtil.to(protocolVersion, 7));
response.writeByte(1); // length
response.writeByte(type);
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private int readInt(ByteBuf buf, int length) {
return Integer.parseInt(buf.readCharSequence(length, StandardCharsets.US_ASCII).toString());
}
private double readDouble(ByteBuf buf, int length) {
return Double.parseDouble(buf.readCharSequence(length, StandardCharsets.US_ASCII).toString());
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int productCode = buf.readUnsignedShort();
int protocolVersion = buf.readUnsignedByte();
buf.readUnsignedByte(); // length
int type = buf.readUnsignedByte();
if (type == MSG_KEEPALIVE) {
return null;
}
String vehicleId = buf.readCharSequence(10, StandardCharsets.US_ASCII).toString();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, vehicleId);
if (deviceSession == null) {
sendResponse(channel, productCode, protocolVersion, MSG_NACK);
return null;
}
DateBuilder dateBuilder = new DateBuilder()
.setDate(Calendar.getInstance().get(Calendar.YEAR), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
if (type == MSG_GENERAL) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(dateBuilder.getDate());
buf.skipBytes(10); // reason
buf.readUnsignedShort(); // flags
buf.readUnsignedByte(); // position status
position.setValid(true);
position.set(Position.KEY_SATELLITES, readInt(buf, 2));
double latitude = readInt(buf, 2);
latitude += readDouble(buf, 7) / 60;
position.setLatitude(buf.readUnsignedByte() == 'S' ? -latitude : latitude);
double longitude = readInt(buf, 3);
longitude += readDouble(buf, 7) / 60;
position.setLongitude(buf.readUnsignedByte() == 'W' ? -longitude : longitude);
position.setSpeed(readInt(buf, 3));
position.setCourse(readInt(buf, 3));
readInt(buf, 3); // alternative speed
position.set(Position.KEY_ODOMETER, buf.readUnsignedByte() * 10000 + buf.readUnsignedByte() * 256
+ buf.readUnsignedByte() + buf.readUnsignedByte() * 0.1);
position.set(Position.KEY_HOURS, buf.readUnsignedInt());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
position.set("companyId", buf.readCharSequence(6, StandardCharsets.US_ASCII).toString());
buf.skipBytes(10); // reason data
position.set("tripId", buf.readUnsignedShort());
return position;
} else if (type == MSG_IMMOBILIZER) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, dateBuilder.getDate());
position.set("companyId", buf.readCharSequence(6, StandardCharsets.US_ASCII).toString());
position.set("tripId", buf.readUnsignedShort());
return position;
}
sendResponse(channel, productCode, protocolVersion, MSG_ACK);
return null;
}
}
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