/*
 * 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.ByteBufUtil;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;

import java.net.SocketAddress;

public class SolarPoweredProtocolDecoder extends BaseProtocolDecoder {

    public SolarPoweredProtocolDecoder(Protocol protocol) {
        super(protocol);
    }

    public static final int MSG_ACTIVE_REPORTING = 0x11;

    @Override
    protected Object decode(
            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

        ByteBuf buf = (ByteBuf) msg;

        buf.readUnsignedByte(); // start marker

        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(0, 15);
        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
        if (deviceSession == null) {
            return null;
        }

        int type = buf.readUnsignedByte();
        buf.readUnsignedShort(); // attributes

        if (type == MSG_ACTIVE_REPORTING) {

            Position position = new Position(getProtocolName());
            position.setDeviceId(deviceSession.getDeviceId());

            while (buf.readableBytes() > 2) {
                int tag = buf.readUnsignedByte();
                int length = buf.readUnsignedByte();
                switch (tag) {
                    case 0x81:
                        int status = buf.readUnsignedByte();
                        DateBuilder dateBuilder = new DateBuilder()
                                .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
                                .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
                        position.setTime(dateBuilder.getDate());
                        position.setLatitude(buf.readUnsignedInt() * 0.000001);
                        if (BitUtil.check(status, 3)) {
                            position.setLatitude(-position.getLatitude());
                        }
                        position.setLongitude(buf.readUnsignedInt() * 0.000001);
                        if (BitUtil.check(status, 2)) {
                            position.setLongitude(-position.getLongitude());
                        }
                        position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
                        position.set(Position.KEY_DEVICE_TEMP, (int) buf.readByte());
                        position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 0.02);
                        position.setCourse(buf.readUnsignedByte());
                        break;
                    default:
                        buf.skipBytes(length);
                        break;
                }
            }

            return position;

        }

        return null;
    }

}

@@ -14,16 +14,23 @@
 ht 2019 
+- 2020 
 Anton Ta
@@ -3214,204 +3214,1021 @@
     
-position.set(Position.KEY_DEVICE_TEMP, (int) buf.readByte());%0A                        position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 0.02);%0A                        position.setCourse(
+int temperature = buf.readUnsignedByte();%0A                        if (BitUtil.check(temperature, 7)) %7B%0A                            position.set(Position.KEY_DEVICE_TEMP, -BitUtil.to(temperature, 7));%0A                        %7D else %7B%0A                            position.set(Position.KEY_DEVICE_TEMP, BitUtil.to(temperature, 7));%0A                        %7D%0A                        position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 0.02);%0A                        position.setCourse(buf.readUnsignedByte());%0A                        break;%0A                    case 0x83:%0A                        buf.readUnsignedInt(); // uptime%0A                        buf.readUnsignedInt(); // gps count%0A                        buf.readUnsignedInt(); // gsm count%0A                        buf.readUnsignedByte(); // positioning time%0A                        buf.readUnsignedByte(); // registration time%0A                        buf.readUnsignedByte(); // connection time%0A                        position.set(Position.KEY_RSSI, 
 buf.

Decode GSM signal