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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.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class NyitechProtocolDecoder extends BaseProtocolDecoder {
public NyitechProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final short MSG_LOGIN = 0x1001;
public static final short MSG_COMPREHENSIVE_LIVE = 0x2001;
public static final short MSG_COMPREHENSIVE_HISTORY = 0x2002;
public static final short MSG_ALARM = 0x2003;
public static final short MSG_FIXED = 0x2004;
private void decodeLocation(Position position, ByteBuf buf) {
DateBuilder dateBuilder = new DateBuilder()
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
int flags = buf.readUnsignedByte();
position.setValid(BitUtil.to(flags, 2) > 0);
double lat = buf.readUnsignedIntLE() / 3600000.0;
double lon = buf.readUnsignedIntLE() / 3600000.0;
position.setLatitude(BitUtil.check(flags, 2) ? lat : -lat);
position.setLongitude(BitUtil.check(flags, 3) ? lon : -lon);
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShortLE()));
position.setCourse(buf.readUnsignedShortLE() * 0.1);
position.setAltitude(buf.readShortLE() * 0.1);
}
private String decodeAlarm(int type) {
switch (type) {
case 0x09:
return Position.ALARM_ACCELERATION;
case 0x0a:
return Position.ALARM_BRAKING;
case 0x0b:
return Position.ALARM_CORNERING;
case 0x0e:
return Position.ALARM_SOS;
default:
return null;
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.readUnsignedShortLE(); // length
String id = buf.readCharSequence(12, StandardCharsets.US_ASCII).toString();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
int type = buf.readUnsignedShortLE();
if (type != MSG_LOGIN && type != MSG_COMPREHENSIVE_LIVE
&& type != MSG_COMPREHENSIVE_HISTORY && type != MSG_ALARM && type != MSG_FIXED) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
if (type == MSG_COMPREHENSIVE_LIVE || type == MSG_COMPREHENSIVE_HISTORY) {
buf.skipBytes(6); // time
buf.skipBytes(3); // data
} else if (type == MSG_ALARM) {
buf.readUnsignedShortLE(); // random number
buf.readUnsignedByte(); // tag
position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
buf.readUnsignedShortLE(); // threshold
buf.readUnsignedShortLE(); // value
buf.skipBytes(6); // time
} else if (type == MSG_FIXED) {
buf.skipBytes(6); // time
}
decodeLocation(position, buf);
return position;
}
}
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