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/*
* Copyright 2022 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.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import org.traccar.session.DeviceSession;
import java.net.SocketAddress;
import java.util.Date;
public class NdtpV6ProtocolDecoder extends BaseProtocolDecoder {
public NdtpV6ProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final byte[] SIGNATURE = {0x7E, 0x7E};
private static final int NPL_FLAG_CRC = 2;
private static final int NPH_RESULT_OK = 0x00000000;
private static final int NPL_TYPE_NPH = 2;
private static final int NPL_ADDRESS_SERVER = 0;
private static final int NPH_RESULT = 0;
private static final int NPH_SRV_GENERIC_CONTROLS = 0;
private static final int NPH_SRV_NAVDATA = 1;
private static final int NPH_SGC_RESULT = NPH_RESULT;
private static final int NPH_SGC_CONN_REQUEST = 100;
private static final int NPH_SND_RESULT = NPH_RESULT;
private void sendResponse(
Channel channel, int serviceId, long requestId) {
ByteBuf content = Unpooled.buffer();
content.writeShortLE(serviceId);
content.writeIntLE(NPH_SND_RESULT);
content.writeIntLE((int) requestId);
content.writeIntLE(NPH_RESULT_OK);
ByteBuf response = Unpooled.buffer();
response.writeBytes(SIGNATURE);
response.writeShortLE(content.readableBytes());
response.writeShortLE(NPL_FLAG_CRC); // flags
response.writeShort(Checksum.crc16(Checksum.CRC16_MODBUS, content.nioBuffer()));
response.writeByte(NPL_TYPE_NPH); // type
response.writeIntLE(NPL_ADDRESS_SERVER); // peer address
response.writeShortLE(0); // request id
response.writeBytes(content);
content.release();
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
private static final short MAIN_NAV_DATA = 0;
private static final short ADDITIONAL_NAV_DATA = 2;
private void decodeData(ByteBuf buf, Position position) {
short itemType;
short itemIndex;
itemType = buf.readUnsignedByte();
itemIndex = buf.readUnsignedByte();
if (itemType == MAIN_NAV_DATA && (itemIndex == 0 || itemIndex == 1)) {
position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
position.setLongitude(buf.readIntLE() / 10000000.0);
position.setLatitude(buf.readIntLE() / 10000000.0);
short flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 7));
if (BitUtil.check(flags, 1)) {
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
}
position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 20);
position.set(Position.KEY_OBD_SPEED, buf.readUnsignedShortLE());
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE()));
position.setCourse(buf.readUnsignedShortLE());
position.set(Position.KEY_ODOMETER, buf.readUnsignedShortLE());
position.setAltitude(buf.readShortLE());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_PDOP, buf.readUnsignedByte());
}
itemType = buf.readUnsignedByte();
itemIndex = buf.readUnsignedByte();
if (itemType == ADDITIONAL_NAV_DATA && itemIndex == 0) {
position.set(Position.KEY_BATTERY_LEVEL, Math.max((buf.readUnsignedShortLE() - 3600) / 6, 100));
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShortLE());
position.set(Position.PREFIX_ADC + 3, buf.readUnsignedShortLE());
position.set(Position.PREFIX_ADC + 4, buf.readUnsignedShortLE());
buf.readUnsignedByte(); // inputs
buf.readUnsignedByte(); // outputs
buf.readUnsignedShortLE(); // in1 count
buf.readUnsignedShortLE(); // in2 count
buf.readUnsignedShortLE(); // in3 count
buf.readUnsignedShortLE(); // in4 count
buf.readUnsignedIntLE(); // track length
position.set(Position.KEY_ANTENNA, buf.readUnsignedByte());
position.set(Position.KEY_GPS, buf.readUnsignedByte());
position.set(Position.KEY_ACCELERATION, buf.readUnsignedByte());
position.set(Position.KEY_POWER, buf.readUnsignedByte() * 200);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
buf.skipBytes(2); // signature
buf.readUnsignedShortLE(); // length
buf.readUnsignedShortLE(); // connection flags
buf.readUnsignedShortLE(); // checksum
buf.readUnsignedByte(); // type
buf.readUnsignedIntLE(); // address
buf.readUnsignedShortLE(); // identification
int serviceId = buf.readUnsignedShortLE();
int serviceType = buf.readUnsignedShortLE();
buf.readUnsignedShortLE(); // request flags
long requestId = buf.readUnsignedIntLE();
if (deviceSession == null && serviceId == NPH_SRV_GENERIC_CONTROLS && serviceType == NPH_SGC_CONN_REQUEST) {
buf.readUnsignedShortLE(); // version major
buf.readUnsignedShortLE(); // version minor
buf.readUnsignedShortLE(); // connection flags
int deviceId = buf.readUnsignedShortLE();
Position position = new Position(getProtocolName());
deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceId));
position.setDeviceId(deviceSession.getDeviceId());
if (channel != null) {
sendResponse(channel, serviceId, requestId);
}
position.set(Position.KEY_RESULT, String.valueOf(NPH_SGC_RESULT));
position.setTime(new Date());
getLastLocation(position, new Date());
position.setValid(false);
return position;
}
if (serviceId == NPH_SRV_NAVDATA) {
deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
if (channel != null) {
sendResponse(channel, serviceId, requestId);
}
decodeData(buf, position);
return position;
}
return null;
}
}
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