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/*
* Copyright 2017 - 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.DeviceSession;
import org.traccar.NetworkMessage;
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 Gps056ProtocolDecoder extends BaseProtocolDecoder {
public Gps056ProtocolDecoder(Gps056Protocol protocol) {
super(protocol);
}
private static void sendResponse(Channel channel, String type, String imei, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
String header = "*" + type + imei;
response.writeBytes(header.getBytes(StandardCharsets.US_ASCII));
if (content != null) {
response.writeBytes(content);
}
response.writeByte('#');
channel.write(new NetworkMessage(response, channel.remoteAddress()));
}
}
private static double decodeCoordinate(ByteBuf buf) {
double degrees = buf.getUnsignedShort(buf.readerIndex()) / 100;
double minutes = buf.readUnsignedShort() % 100 + buf.readUnsignedShort() * 0.0001;
degrees += minutes / 60;
byte hemisphere = buf.readByte();
if (hemisphere == 'S' || hemisphere == 'W') {
degrees = -degrees;
}
return degrees;
}
private static void decodeStatus(ByteBuf buf, Position position) {
position.set(Position.KEY_INPUT, buf.readUnsignedByte());
position.set(Position.KEY_OUTPUT, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 1, buf.readShortLE() * 5.06); // mV
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.skipBytes(2); // length
String type = buf.readBytes(7).toString(StandardCharsets.US_ASCII);
String imei = buf.readBytes(15).toString(StandardCharsets.US_ASCII);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
if (type.startsWith("LOGN")) {
sendResponse(channel, "LGSA" + type.substring(4), imei,
Unpooled.copiedBuffer("1", StandardCharsets.US_ASCII));
} else if (type.startsWith("GPSL")) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setValid(true);
position.setTime(dateBuilder.getDate());
position.setLatitude(decodeCoordinate(buf));
position.setLongitude(decodeCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedShort());
decodeStatus(buf, position);
sendResponse(channel, "GPSA" + type.substring(4), imei, buf.readBytes(2));
return position;
} else if (type.startsWith("SYNC")) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
decodeStatus(buf, position);
sendResponse(channel, "SYSA" + type.substring(4), imei, null);
return position;
}
return null;
}
}
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