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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.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.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class NavisetProtocolDecoder extends BaseProtocolDecoder {
public NavisetProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_HEADER = 0b00;
public static final int MSG_DATA = 0b01;
public static final int MSG_RESPONSE = 0b10;
public static final int MSG_RESERVE = 0b11;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0x01);
response.writeShortLE(buf.getUnsignedShortLE(buf.writerIndex() - 2));
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
int length = buf.readUnsignedShortLE();
BitUtil.between(length, 12, 14); // version
int type = BitUtil.between(length, 14, 16);
buf.readUnsignedShortLE(); // device number
if (type == MSG_HEADER) {
getDeviceSession(channel, remoteAddress, buf.readCharSequence(15, StandardCharsets.US_ASCII).toString());
} else if (type == MSG_DATA) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // mask
position.set(Position.KEY_INDEX, buf.readUnsignedShortLE());
position.set(Position.KEY_STATUS, buf.readUnsignedByte());
position.setValid(true);
position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
position.setLatitude(buf.readUnsignedIntLE() * 0.000001);
position.setLongitude(buf.readUnsignedIntLE() * 0.000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE() * 0.1));
// additional data
return position;
}
return null;
}
}
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