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/*
* Copyright 2024 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 jakarta.json.Json;
import jakarta.json.JsonObject;
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.model.Position;
import org.traccar.session.DeviceSession;
import java.io.StringReader;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
public class SnapperProtocolDecoder extends BaseProtocolDecoder {
public SnapperProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_HELLO = 0x01;
public static final int MSG_SENDING_START = 0x02;
public static final int MSG_SENDING_FINISH = 0x03;
public static final int MSG_SEND_EVENTS = 0x21;
public static final int MSG_SEND_TECH_INFO = 0x23;
public static final int MSG_UPDATE_CMS_NUM = 0x24;
public static final int MSG_SEND_SYSTEM_INFO = 0x26;
public static final int MSG_SEND_USER_PHONE_NUMBERS = 0x31;
public static final int MSG_SEND_GPS_DATA = 0x32;
public static final int MSG_SEND_LBS_DATA = 0x33;
public static final int MSG_SEND_SYSTEM_STATUS = 0x34;
public static final int MSG_SEND_TRANSIT_SETTINGS = 0x35;
public static final int MSG_GET_SETTINGS = 0x36;
public static final int MSG_SEND_CONCATENATED_PACKET = 0x37;
public static final int MSG_SEND_DEBUG_INFO = 0x38;
private void sendResponse(
Channel channel, SocketAddress remoteAddress, int index, int type, String answer) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte('K');
response.writeByte(3); // protocol version
response.writeLongLE(0); // reserved
response.writeShortLE(0); // encryption
response.writeIntLE(answer.length());
response.writeIntLE(0); // reserved
response.writeShortLE(index);
response.writeByte(Checksum.sum(ByteBuffer.wrap(answer.getBytes(StandardCharsets.US_ASCII))));
response.writeShortLE(type);
response.writeCharSequence(answer, StandardCharsets.US_ASCII);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private void decodeEvents(Position position, ByteBuf buf) {
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
buf.readUnsignedByte(); // info 1
buf.readUnsignedByte(); // info 2
buf.readUnsignedIntLE(); // timestamp
buf.readUnsignedByte(); // timezone
}
private void decodeTechInfo(Position position, ByteBuf buf) {
for (int i = 0; i < 5; i++) {
buf.readUnsignedByte(); // index
int type = buf.readUnsignedByte();
switch (type) {
case 0x00:
position.set(Position.KEY_POWER, buf.readUnsignedByte() * 0.1);
position.set(Position.KEY_DEVICE_TEMP, buf.readByte());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
break;
case 0x01:
position.set("interiorTemp", buf.readByte());
position.set("engineTemp", buf.readByte());
buf.readUnsignedByte(); // reserved
break;
default:
buf.skipBytes(3);
break;
}
}
}
private void decodeGpsData(Position position, ByteBuf buf) throws ParseException {
String content = buf.readCharSequence(buf.readableBytes(), StandardCharsets.US_ASCII).toString();
JsonObject json = Json.createReader(new StringReader(content)).readObject();
int flags = Integer.parseInt(json.getString("f"), 16);
if (!BitUtil.check(flags, 3)) {
return;
}
position.setValid(BitUtil.check(flags, 1));
if (!BitUtil.check(flags, 6)) {
position.setLatitude(-position.getLatitude());
}
if (!BitUtil.check(flags, 7)) {
position.setLongitude(-position.getLongitude());
}
DateFormat dateFormat = new SimpleDateFormat("ddMMyyHHmmss");
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
position.setTime(dateFormat.parse(json.getString("d") + json.getString("t").split("\\.")[0]));
String lat = json.getString("la");
position.setLatitude(Integer.parseInt(lat.substring(0, 2)) + Double.parseDouble(lat.substring(2)) / 60);
String lon = json.getString("lo");
position.setLongitude(Integer.parseInt(lon.substring(0, 3)) + Double.parseDouble(lon.substring(3)) / 60);
position.setAltitude(Double.parseDouble(json.getString("a")));
position.setSpeed(Double.parseDouble(json.getString("s")));
position.setCourse(Double.parseDouble(json.getString("c")));
position.set(Position.KEY_SATELLITES, Integer.parseInt(json.getString("sv")));
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
buf.readUnsignedByte(); // protocol version
buf.readUnsignedIntLE(); // system bonus identifier
String serialNumber = String.valueOf(buf.readUnsignedIntLE());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, serialNumber);
if (deviceSession == null) {
return null;
}
buf.readUnsignedShortLE(); // encryption
int length = buf.readIntLE();
buf.readUnsignedByte(); // flags
buf.readUnsignedMediumLE(); // reserved
int index = buf.readUnsignedShortLE();
buf.readUnsignedByte(); // checksum
int type = buf.readUnsignedShortLE();
if (type == MSG_HELLO) {
sendResponse(channel, remoteAddress, index, type, "hello");
} else {
sendResponse(channel, remoteAddress, index, type, "OK");
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
switch (type) {
case MSG_SEND_EVENTS:
decodeEvents(position, buf);
getLastLocation(position, null); // TODO read timestamp
return position;
case MSG_SEND_TECH_INFO:
decodeTechInfo(position, buf);
getLastLocation(position, null);
return position;
case MSG_SEND_GPS_DATA:
decodeGpsData(position, buf.readSlice(length));
return position;
case MSG_SEND_CONCATENATED_PACKET:
int count = buf.readUnsignedShortLE();
for (int i = 0; i < count; i++) {
int partType = buf.readUnsignedShortLE();
int partLength = buf.readUnsignedShortLE();
switch (partType) {
case MSG_SEND_EVENTS:
decodeEvents(position, buf);
break;
case MSG_SEND_TECH_INFO:
decodeTechInfo(position, buf);
break;
case MSG_SEND_GPS_DATA:
decodeGpsData(position, buf.readSlice(partLength));
break;
default:
buf.skipBytes(partLength);
break;
}
}
if (position.getFixTime() == null) {
getLastLocation(position, null);
}
return position;
default:
return null;
}
}
}
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