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/*
* Copyright 2020 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.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.BcdUtil;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class NiotProtocolDecoder extends BaseProtocolDecoder {
public NiotProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_RESPONSE = 0x21;
public static final int MSG_POSITION_DATA = 0x80;
private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int checksum) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(0x5858); // header
response.writeByte(MSG_RESPONSE);
response.writeShort(5); // length
response.writeByte(checksum);
response.writeByte(type);
response.writeByte(0); // subtype
response.writeByte(Checksum.xor(response.nioBuffer(2, response.writerIndex())));
response.writeByte(0x0D);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private double readCoordinate(ByteBuf buf) {
long value = buf.readUnsignedInt();
double result = BitUtil.to(value, 31) / 1800000.0;
return BitUtil.check(value, 31) ? -result : result;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
sendResponse(channel, remoteAddress, type, buf.getByte(buf.writerIndex() - 2));
if (type == MSG_POSITION_DATA) {
Position position = new Position(getProtocolName());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setYear(BcdUtil.readInteger(buf, 2))
.setMonth(BcdUtil.readInteger(buf, 2))
.setDay(BcdUtil.readInteger(buf, 2))
.setHour(BcdUtil.readInteger(buf, 2))
.setMinute(BcdUtil.readInteger(buf, 2))
.setSecond(BcdUtil.readInteger(buf, 2));
position.setTime(dateBuilder.getDate());
position.setValid(true);
position.setLatitude(readCoordinate(buf));
position.setLongitude(readCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(BcdUtil.readInteger(buf, 4)));
position.setCourse(BcdUtil.readInteger(buf, 4));
return position;
}
return null;
}
}
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