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/*
* Copyright 2016 - 2018 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class NvsProtocolDecoder extends BaseProtocolDecoder {
public NvsProtocolDecoder(Protocol protocol) {
super(protocol);
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, String response) {
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(
Unpooled.copiedBuffer(response, StandardCharsets.US_ASCII), remoteAddress));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
if (buf.getUnsignedByte(buf.readerIndex()) == 0) {
buf.readUnsignedShort(); // length
String imei = buf.toString(buf.readerIndex(), 15, StandardCharsets.US_ASCII);
if (getDeviceSession(channel, remoteAddress, imei) != null) {
sendResponse(channel, remoteAddress, "OK");
} else {
sendResponse(channel, remoteAddress, "NO01");
}
} else {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
buf.skipBytes(4); // marker
buf.readUnsignedShort(); // length
buf.readLong(); // imei
buf.readUnsignedByte(); // codec
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedInt() * 1000));
position.set("reason", buf.readUnsignedByte());
position.setLongitude(buf.readInt() / 10000000.0);
position.setLatitude(buf.readInt() / 10000000.0);
position.setAltitude(buf.readShort());
position.setCourse(buf.readUnsignedShort());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.setValid(buf.readUnsignedByte() != 0);
buf.readUnsignedByte(); // used systems
buf.readUnsignedByte(); // cause element id
// Read 1 byte data
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedByte());
}
// Read 2 byte data
cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedShort());
}
// Read 4 byte data
cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedInt());
}
// Read 8 byte data
cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readLong());
}
positions.add(position);
}
return positions;
}
return null;
}
}
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