//-----------------------------------------------------------------------------
// 2022 Ahoy, https://www.mikrocontroller.net/topic/525778
// Creative Commons - http://creativecommons.org/licenses/by-nc-sa/3.0/de/
//-----------------------------------------------------------------------------

#if defined(ESP32) && defined(F)
  #undef F
  #define F(sl) (sl)
#endif

#include "app.h"
#include <ArduinoJson.h>


//-----------------------------------------------------------------------------
app::app() {
    Serial.begin(115200);
    DPRINTLN(DBG_VERBOSE, F("app::app"));
    mEep = new eep();
    mWifi = new ahoywifi(this, &mSysConfig, &mConfig);

    resetSystem();
    loadDefaultConfig();

    mSys = new HmSystemType();
    mShouldReboot = false;
}


//-----------------------------------------------------------------------------
void app::setup(uint32_t timeout) {
    DPRINTLN(DBG_VERBOSE, F("app::setup"));

    mWifiSettingsValid = checkEEpCrc(ADDR_START, ADDR_WIFI_CRC, ADDR_WIFI_CRC);
    mSettingsValid = checkEEpCrc(ADDR_START_SETTINGS, ((ADDR_NEXT)-(ADDR_START_SETTINGS)), ADDR_SETTINGS_CRC);
    loadEEpconfig();

    mWifi->setup(timeout, mWifiSettingsValid);

    #ifndef AP_ONLY
        setupMqtt();
    #endif
    mSys->setup(mConfig.amplifierPower, mConfig.pinIrq, mConfig.pinCe, mConfig.pinCs);

    mWebInst = new web(this, &mSysConfig, &mConfig, &mStat, mVersion);
    mWebInst->setup();
}

//-----------------------------------------------------------------------------
void app::loop(void) {
    DPRINTLN(DBG_VERBOSE, F("app::loop"));

    bool apActive = mWifi->loop();
    mWebInst->loop();

    if(millis() - mPrevMillis >= 1000) {
        mPrevMillis += 1000;
        mUptimeSecs++;
        if(0 != mUtcTimestamp)
            mUtcTimestamp++;
    }

    if(checkTicker(&mNtpRefreshTicker, mNtpRefreshInterval)) {
        if(!apActive)
            mUpdateNtp = true;
    }

    if(mUpdateNtp) {
        mUpdateNtp = false;
        mUtcTimestamp = mWifi->getNtpTime();
        DPRINTLN(DBG_INFO, F("[NTP]: ") + getDateTimeStr(mUtcTimestamp) + F(" UTC"));
    }

    if(mFlagSendDiscoveryConfig) {
        mFlagSendDiscoveryConfig = false;
        sendMqttDiscoveryConfig();
    }

    if(mShouldReboot) {
        DPRINTLN(DBG_INFO, F("Rebooting..."));
        ESP.restart();
    }

    
    mSys->Radio.loop();

    yield();

    if(checkTicker(&mRxTicker, 5)) 
    {
        bool rxRdy = mSys->Radio.switchRxCh();

        if(!mSys->BufCtrl.empty()) 
        {
            uint8_t len;
            packet_t *p = mSys->BufCtrl.getBack();

            if(mSys->Radio.checkPaketCrc(p->packet, &len, p->rxCh)) 
            {
                // process buffer only on first occurrence
                if(mConfig.serialDebug) {
                    DPRINT(DBG_INFO, "RX " + String(len) + "B Ch" + String(p->rxCh) + " | ");
                    mSys->Radio.dumpBuf(NULL, p->packet, len);
                }

                mStat.frmCnt++;

                if(0 != len) 
                {
                    Inverter<> *iv = mSys->findInverter(&p->packet[1]);
                    if((NULL != iv) && (p->packet[0] == (TX_REQ_INFO + ALL_FRAMES)))  // response from get information command
                    {
                        mPayload[iv->id].txId = p->packet[0];
                        DPRINTLN(DBG_DEBUG, F("Response from info request received"));
                        uint8_t *pid = &p->packet[9];
                        if (*pid == 0x00)
                        {
                            DPRINT(DBG_DEBUG, F("fragment number zero received and ignored"));
                        } 
                        else 
                        {
                            DPRINTLN(DBG_DEBUG, "PID: 0x" + String(*pid, HEX));
                            if ((*pid & 0x7F) < 5) {
                                memcpy(mPayload[iv->id].data[(*pid & 0x7F) - 1], &p->packet[10], len - 11);
                                mPayload[iv->id].len[(*pid & 0x7F) - 1] = len - 11;
                            }

                            if ((*pid & ALL_FRAMES) == ALL_FRAMES) 
                            {
                                // Last packet
                                if ((*pid & 0x7f) > mPayload[iv->id].maxPackId) {
                                    mPayload[iv->id].maxPackId = (*pid & 0x7f);
                                    if (*pid > 0x81)
                                        mLastPacketId = *pid;
                                }
                            }
                        }
                    }
                    if((NULL != iv) && (p->packet[0] == (TX_REQ_DEVCONTROL + ALL_FRAMES))) // response from dev control command
                    {
                        DPRINTLN(DBG_DEBUG, F("Response from devcontrol request received"));

                        mPayload[iv->id].txId = p->packet[0];
                        iv->devControlRequest = false;

                        if ((p->packet[12] == ActivePowerContr) && (p->packet[13] == 0x00)) 
                        {
                            String msg = (p->packet[10] == 0x00 && p->packet[11] == 0x00) ? "" : "NOT ";
                            DPRINTLN(DBG_INFO, F("Inverter ") + String(iv->id) +  F(" has ") + msg + F("accepted power limit set point ") + String(iv->powerLimit[0]) + F(" with PowerLimitControl ")  + String(iv->powerLimit[1]));  
                        }
                        iv->devControlCmd = Init;
                    }
                }
            }
            mSys->BufCtrl.popBack();
        }
        yield();


        if(rxRdy) {
            processPayload(true);
        }
    }

    if(mMqttActive)
        mMqtt.loop();

    if(checkTicker(&mTicker, 1000)) {
        if(mUtcTimestamp > 946684800 && mConfig.sunLat && mConfig.sunLon && (mUtcTimestamp + mCalculatedTimezoneOffset) / 86400 != (mLatestSunTimestamp + mCalculatedTimezoneOffset) / 86400) { // update on reboot or midnight
            if (!mLatestSunTimestamp) { // first call: calculate time zone from longitude to refresh at local midnight
                mCalculatedTimezoneOffset = (int8_t)((mConfig.sunLon >= 0 ? mConfig.sunLon + 7.5 : mConfig.sunLon - 7.5) / 15) * 3600;
            }
            calculateSunriseSunset();
            mLatestSunTimestamp = mUtcTimestamp;
        }

        if((++mMqttTicker >= mMqttInterval) && (mMqttInterval != 0xffff) && mMqttActive) {
            mMqttTicker = 0;
            mMqtt.isConnected(true); // really needed? See comment from HorstG-57 #176
            char val[10];
            snprintf(val, 10, "%ld", millis()/1000);

            mMqtt.sendMsg("uptime", val);

#ifdef __MQTT_TEST__
            // für einfacheren Test mit MQTT, den MQTT abschnitt in 10 Sekunden wieder ausführen
            mMqttTicker = mMqttInterval -10;
#endif
        }

        if(mConfig.serialShowIv) {
            if(++mSerialTicker >= mConfig.serialInterval) {
                mSerialTicker = 0;
                char topic[30], val[10];
                for(uint8_t id = 0; id < mSys->getNumInverters(); id++) {
                    Inverter<> *iv = mSys->getInverterByPos(id);
                    if(NULL != iv) {
                        record_t<> *rec = iv->getRecordStruct(RealTimeRunData_Debug);
                        if(iv->isAvailable(mUtcTimestamp, rec)) {
                            DPRINTLN(DBG_INFO, "Inverter: " + String(id));
                            for(uint8_t i = 0; i < rec->length; i++) {
                                if(0.0f != iv->getValue(i, rec)) {
                                    snprintf(topic, 30, "%s/ch%d/%s", iv->name, rec->assign[i].ch, iv->getFieldName(i, rec));
                                    snprintf(val, 10, "%.3f %s", iv->getValue(i, rec), iv->getUnit(i, rec));
                                    DPRINTLN(DBG_INFO, String(topic) + ": " + String(val));
                                }
                                yield();
                            }
                            DPRINTLN(DBG_INFO, "");                            
                        }
                    }
                }
            }
        }

        if(++mSendTicker >= mConfig.sendInterval) {
            mSendTicker = 0;

            if(mUtcTimestamp > 946684800 && (!mConfig.sunDisNightCom || !mLatestSunTimestamp || (mUtcTimestamp >= mSunrise && mUtcTimestamp <= mSunset))) { // Timestamp is set and (inverter communication only during the day if the option is activated and sunrise/sunset is set)
                if(mConfig.serialDebug)
                    DPRINTLN(DBG_DEBUG, F("Free heap: 0x") + String(ESP.getFreeHeap(), HEX));

                if(!mSys->BufCtrl.empty()) {
                    if(mConfig.serialDebug)
                        DPRINTLN(DBG_DEBUG, F("recbuf not empty! #") + String(mSys->BufCtrl.getFill()));
                }

                int8_t maxLoop = MAX_NUM_INVERTERS;
                Inverter<> *iv = mSys->getInverterByPos(mSendLastIvId);
                do {
                    //if(NULL != iv)
                    //    mPayload[iv->id].requested = false;
                    mSendLastIvId = ((MAX_NUM_INVERTERS-1) == mSendLastIvId) ? 0 : mSendLastIvId + 1;
                    iv = mSys->getInverterByPos(mSendLastIvId);
                } while((NULL == iv) && ((maxLoop--) > 0));

                if(NULL != iv) {
                    if(!mPayload[iv->id].complete)
                        processPayload(false);

                    if(!mPayload[iv->id].complete) {
                        if(0 == mPayload[iv->id].maxPackId)
                            mStat.rxFailNoAnser++;
                        else
                            mStat.rxFail++;

                        iv->setQueuedCmdFinished(); // command failed
                        if(mConfig.serialDebug)
                            DPRINTLN(DBG_INFO, F("enqueued cmd failed/timeout"));
                        if(mConfig.serialDebug) {
                            DPRINT(DBG_INFO, F("Inverter #") + String(iv->id) + " ");
                            DPRINTLN(DBG_INFO, F("no Payload received! (retransmits: ") + String(mPayload[iv->id].retransmits) + ")");
                        }
                    }

                    resetPayload(iv);
                    mPayload[iv->id].requested = true;

                    yield();
                    if(mConfig.serialDebug) {
                        DPRINTLN(DBG_DEBUG, F("app:loop WiFi WiFi.status ") + String(WiFi.status()));
                        DPRINTLN(DBG_INFO, F("Requesting Inverter SN ") + String(iv->serial.u64, HEX));
                    }

                    if(iv->devControlRequest) 
                    {
                        if(mConfig.serialDebug)
                            DPRINTLN(DBG_INFO, F("Devcontrol request ") + String(iv->devControlCmd) + F(" power limit ") + String(iv->powerLimit[0]));
                        mSys->Radio.sendControlPacket(iv->radioId.u64, iv->devControlCmd, iv->powerLimit);
                        mPayload[iv->id].txCmd = iv->devControlCmd;
                        iv->clearCmdQueue();
                        iv->enqueCommand<InfoCommand>(SystemConfigPara);
                    }
                    else 
                    {
                        uint8_t cmd = iv->getQueuedCmd();
                        mSys->Radio.sendTimePacket(iv->radioId.u64, cmd, mPayload[iv->id].ts, iv->alarmMesIndex);
                        mPayload[iv->id].txCmd = cmd;
                        mRxTicker = 0;
                    }
                }
            }
            else if(mConfig.serialDebug)
                DPRINTLN(DBG_WARN, F("Time not set or it is night time, therefore no communication to the inverter!"));
            yield();
        }
    }
}


//-----------------------------------------------------------------------------
void app::handleIntr(void) {
    DPRINTLN(DBG_VERBOSE, F("app::handleIntr"));
    mSys->Radio.handleIntr();
}


//-----------------------------------------------------------------------------
bool app::buildPayload(uint8_t id) {
    DPRINTLN(DBG_VERBOSE, F("app::buildPayload"));
    uint16_t crc = 0xffff, crcRcv = 0x0000;
    if(mPayload[id].maxPackId > MAX_PAYLOAD_ENTRIES)
        mPayload[id].maxPackId = MAX_PAYLOAD_ENTRIES;

    for(uint8_t i = 0; i < mPayload[id].maxPackId; i ++) {
        if(mPayload[id].len[i] > 0) {
            if(i == (mPayload[id].maxPackId-1)) {
                crc = ah::crc16(mPayload[id].data[i], mPayload[id].len[i] - 2, crc);
                crcRcv = (mPayload[id].data[i][mPayload[id].len[i] - 2] << 8)
                    | (mPayload[id].data[i][mPayload[id].len[i] - 1]);
            }
            else
                crc = ah::crc16(mPayload[id].data[i], mPayload[id].len[i], crc);
        }
        yield();
    }

    return (crc == crcRcv) ? true : false;
}


//-----------------------------------------------------------------------------
void app::processPayload(bool retransmit) { 

#ifdef __MQTT_AFTER_RX__
    boolean doMQTT = false;
#endif

    //DPRINTLN(DBG_INFO, F("processPayload"));
    for(uint8_t id = 0; id < mSys->getNumInverters(); id++) {
        Inverter<> *iv = mSys->getInverterByPos(id);
        if(NULL != iv) {
            if((mPayload[iv->id].txId != (TX_REQ_INFO + ALL_FRAMES)) && (0 != mPayload[iv->id].txId)) {
                // no processing needed if txId is not 0x95
                //DPRINTLN(DBG_INFO, F("processPayload - set complete, txId: ") + String(mPayload[iv->id].txId, HEX));
                mPayload[iv->id].complete = true;
            }

            if(!mPayload[iv->id].complete ) 
            {
                if(!buildPayload(iv->id)) // payload not complete
                { 
                    if(mPayload[iv->id].requested) 
                    {
                        if(retransmit) 
                        {
                            if(iv->devControlCmd == Restart || iv->devControlCmd == CleanState_LockAndAlarm ) {
                                // This is required to prevent retransmissions without answer.
                                DPRINTLN(DBG_INFO, F("Prevent retransmit on Restart / CleanState_LockAndAlarm..."));
                                mPayload[iv->id].retransmits = mConfig.maxRetransPerPyld;
                            } 
                            else 
                            {
                                if(mPayload[iv->id].retransmits < mConfig.maxRetransPerPyld) 
                                {
                                    mPayload[iv->id].retransmits++;
                                    if(mPayload[iv->id].maxPackId != 0) 
                                    {
                                        for(uint8_t i = 0; i < (mPayload[iv->id].maxPackId-1); i++) {
                                            if(mPayload[iv->id].len[i] == 0) {
                                                if(mConfig.serialDebug)
                                                    DPRINTLN(DBG_WARN, F("while retrieving data: Frame ") + String(i+1) + F(" missing: Request Retransmit"));
                                                mSys->Radio.sendCmdPacket(iv->radioId.u64, TX_REQ_INFO, (SINGLE_FRAME+i), true);
                                                break; // only retransmit one frame per loop
                                            }
                                            yield();
                                        }
                                    }
                                    else 
                                    {
                                        if(mConfig.serialDebug)
                                            DPRINTLN(DBG_WARN, F("while retrieving data: last frame missing: Request Retransmit"));
                                        if(0x00 != mLastPacketId)
                                            mSys->Radio.sendCmdPacket(iv->radioId.u64, TX_REQ_INFO, mLastPacketId, true);
                                        else {
                                            mPayload[iv->id].txCmd = iv->getQueuedCmd();
                                            mSys->Radio.sendTimePacket(iv->radioId.u64, mPayload[iv->id].txCmd, mPayload[iv->id].ts, iv->alarmMesIndex);
                                        }
                                    }
                                    mSys->Radio.switchRxCh(100);
                                }
                            }
                        }
                    }
                }
                else 
                { // payload complete
                    DPRINTLN(DBG_INFO, F("procPyld: cmd:  ") + String(mPayload[iv->id].txCmd));
                    DPRINTLN(DBG_INFO, F("procPyld: txid: 0x") + String(mPayload[iv->id].txId, HEX));
                    DPRINTLN(DBG_DEBUG, F("procPyld: max:  ") + String(mPayload[iv->id].maxPackId));
                    record_t<> *rec = iv->getRecordStruct(mPayload[iv->id].txCmd); // choose the parser
                    mPayload[iv->id].complete = true;

                    uint8_t payload[128];
                    uint8_t payloadLen = 0;

                    memset(payload, 0, 128);

                    for(uint8_t i = 0; i < (mPayload[iv->id].maxPackId); i ++) {
                        memcpy(&payload[payloadLen], mPayload[iv->id].data[i], (mPayload[iv->id].len[i]));
                        payloadLen += (mPayload[iv->id].len[i]);
                        yield();
                    }
                    payloadLen-=2;

                    if(mConfig.serialDebug) {
                        DPRINT(DBG_INFO, F("Payload (") + String(payloadLen) + "): ");
                        mSys->Radio.dumpBuf(NULL, payload, payloadLen);
                    }

                    if(NULL == rec) {
                        DPRINTLN(DBG_ERROR, F("record is NULL!"));
                    } 
                    else if((rec->pyldLen == payloadLen) || (0 == rec->pyldLen)) {
                        if(mPayload[iv->id].txId == (TX_REQ_INFO + 0x80))
                            mStat.rxSuccess++;

                        rec->ts = mPayload[iv->id].ts;
                        for(uint8_t i = 0; i < rec->length; i++) {
                            iv->addValue(i, payload, rec);
                            yield();
                        }
                        iv->doCalculations();

                        // MQTT send out
                        if(mMqttActive) {
                            record_t<> *recRealtime = iv->getRecordStruct(RealTimeRunData_Debug);
                            char topic[32 + MAX_NAME_LENGTH], val[32];
                            float total[4];
                            memset(total, 0, sizeof(float) * 4);
                            for (uint8_t id = 0; id < mSys->getNumInverters(); id++) {
                                Inverter<> *iv = mSys->getInverterByPos(id);
                                if (NULL != iv) {
                                    if (iv->isAvailable(mUtcTimestamp, rec)) {
                                        for (uint8_t i = 0; i < rec->length; i++) {
                                            snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/ch%d/%s", iv->name, rec->assign[i].ch, fields[rec->assign[i].fieldId]);
                                            snprintf(val, 10, "%.3f", iv->getValue(i, rec));
                                            mMqtt.sendMsg(topic, val);
                                            if(recRealtime == rec) {
                                                if(CH0 == rec->assign[i].ch) {
                                                    switch(rec->assign[i].fieldId) {
                                                        case FLD_PAC: total[0] += iv->getValue(i, rec); break;
                                                        case FLD_YT:  total[1] += iv->getValue(i, rec); break;
                                                        case FLD_YD:  total[2] += iv->getValue(i, rec); break;
                                                        case FLD_PDC: total[3] += iv->getValue(i, rec); break;
                                                    }
                                                }
                                            }

                                            if(iv->isProducing(mUtcTimestamp, rec)){
                                                snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/available_text", iv->name);
                                                snprintf(val, 32, DEF_MQTT_IV_MESSAGE_INVERTER_AVAIL_AND_PRODUCED);
                                                mMqtt.sendMsg(topic, val);

                                                snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/available", iv->name);
                                                snprintf(val, 32, "2");
                                            } else {
                                                snprintf(val, 32, DEF_MQTT_IV_MESSAGE_INVERTER_AVAIL_AND_NOT_PRODUCED);
                                                mMqtt.sendMsg(topic, val);

                                                snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/available", iv->name);
                                                snprintf(val, 32, "1");
                                            }

                                            mMqtt.sendMsg(topic, val);


                                            snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/last_success", iv->name);
                                            snprintf(val, 48, "%i", iv->getLastTs(rec) * 1000);
                                            mMqtt.sendMsg(topic, val);

                                            yield();
                                        }
                                    }
                                }
                            }

                            // total values (sum of all inverters)
                            if(recRealtime == rec) {
                                if(mSys->getNumInverters() > 1) {
                                    uint8_t fieldId = 0;
                                    for (uint8_t i = 0; i < 4; i++) {
                                        switch(i) {
                                            case 0: fieldId = FLD_PAC; break;
                                            case 1: fieldId = FLD_YT;  break;
                                            case 2: fieldId = FLD_YD;  break;
                                            case 3: fieldId = FLD_PDC; break;
                                        }
                                        snprintf(topic, 32 + MAX_NAME_LENGTH, "total/%s", fields[fieldId]);
                                        snprintf(val, 10, "%.3f", total[i]);
                                        mMqtt.sendMsg(topic, val);
                                    }
                                }
                            }
                        }
                    }
                    else {
                        DPRINTLN(DBG_ERROR, F("plausibility check failed, expected ") + String(rec->pyldLen) + F(" bytes"));
                        mStat.rxFail++;
                    }

                    iv->setQueuedCmdFinished();

#ifdef __MQTT_AFTER_RX__
                    doMQTT = true;
#endif
                }
            }

            if(mMqttActive) {
                record_t<> *rec = iv->getRecordStruct(RealTimeRunData_Debug);
                char topic[32 + MAX_NAME_LENGTH], val[32];
                if (!iv->isAvailable(mUtcTimestamp, rec) && !iv->isProducing(mUtcTimestamp, rec)){
                    snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/available_text", iv->name);
                    snprintf(val, 32, DEF_MQTT_IV_MESSAGE_NOT_AVAIL_AND_NOT_PRODUCED);
                    mMqtt.sendMsg(topic, val);
                    snprintf(topic, 32 + MAX_NAME_LENGTH, "%s/available", iv->name);
                    snprintf(val, 32, "0");
                    mMqtt.sendMsg(topic, val);
                }
            }

            yield();
        }
    }

#ifdef __MQTT_AFTER_RX__
    //  ist MQTT aktiviert und es wurden Daten vom einem oder mehreren WR aufbereitet ( doMQTT = true) 
    //  dann die den mMqttTicker auf mMqttIntervall -2 setzen, also  
    //  MQTT aussenden in 2 sek aktivieren 
    //  dies sollte noch über einen Schalter im Setup aktivier / deaktivierbar gemacht werden
    if( (mMqttInterval != 0xffff) && doMQTT ) {
        ++mMqttTicker = mMqttInterval -2;
        DPRINT(DBG_DEBUG, F("MQTTticker auf Intervall -2 sec ")) ;
    }
#endif
}


//-----------------------------------------------------------------------------
void app::cbMqtt(char* topic, byte* payload, unsigned int length) {
    // callback handling on subscribed devcontrol topic
    DPRINTLN(DBG_INFO, F("app::cbMqtt"));
    // subcribed topics are mTopic + "/devcontrol/#" where # is <inverter_id>/<subcmd in dec>
    // eg. mypvsolar/devcontrol/1/11 with payload "400" --> inverter 1 active power limit 400 Watt
    const char *token = strtok(topic, "/");
    while (token != NULL)
    {   
        if (strcmp(token,"devcontrol")==0)
        {
            token = strtok(NULL, "/");
            uint8_t iv_id = std::stoi(token);

            if (iv_id >= 0  && iv_id <= MAX_NUM_INVERTERS)
            {
                Inverter<> *iv = this->mSys->getInverterByPos(iv_id);
                if(NULL != iv) 
                {
                    if (!iv->devControlRequest) // still pending
                    { 
                        token = strtok(NULL, "/");

                        switch ( std::stoi(token) )
                        {
                            // Active Power Control
                            case ActivePowerContr:  
                                token = strtok(NULL, "/"); // get ControlMode aka "PowerPF.Desc" in DTU-Pro Code from topic string
                                if (token == NULL) // default via mqtt ommit the LimitControlMode
                                    iv->powerLimit[1] = AbsolutNonPersistent;
                                else
                                    iv->powerLimit[1] = std::stoi(token);
                                if (length<=5){ // if (std::stoi((char*)payload) > 0) more error handling powerlimit needed?
                                    if (iv->powerLimit[1] >= AbsolutNonPersistent && iv->powerLimit[1] <= RelativPersistent){
                                        iv->devControlCmd = ActivePowerContr;
                                        iv->powerLimit[0] = std::stoi(std::string((char*)payload, (unsigned int)length)); // THX to @silversurfer
                                        if (iv->powerLimit[1] & 0x0001)
                                            DPRINTLN(DBG_INFO, F("Power limit for inverter ") + String(iv->id) + F(" set to ") + String(iv->powerLimit[0]) + F("%") );    
                                        else
                                            DPRINTLN(DBG_INFO, F("Power limit for inverter ") + String(iv->id) + F(" set to ") + String(iv->powerLimit[0]) + F("W") );
                                    }
                                    iv->devControlRequest = true;
                                } else {
                                    DPRINTLN(DBG_INFO, F("Invalid mqtt payload recevied: ") + String((char*)payload));
                                }
                                break;

                            // Turn On
                            case TurnOn: 
                                iv->devControlCmd = TurnOn;
                                DPRINTLN(DBG_INFO, F("Turn on inverter ") + String(iv->id) );
                                iv->devControlRequest = true;
                                break;

                            // Turn Off
                            case TurnOff: 
                                iv->devControlCmd = TurnOff;
                                DPRINTLN(DBG_INFO, F("Turn off inverter ") + String(iv->id) );
                                iv->devControlRequest = true;
                                break;

                            // Restart
                            case Restart: 
                                iv->devControlCmd = Restart;
                                DPRINTLN(DBG_INFO, F("Restart inverter ") + String(iv->id) );
                                iv->devControlRequest = true;
                                break;

                            // Reactive Power Control
                            case ReactivePowerContr: 
                                iv->devControlCmd = ReactivePowerContr;
                                if (true){ // if (std::stoi((char*)payload) > 0) error handling powerlimit needed?
                                    iv->devControlCmd = ReactivePowerContr;
                                    iv->powerLimit[0] = std::stoi(std::string((char*)payload, (unsigned int)length));
                                    iv->powerLimit[1] = 0x0000; // if reactivepower limit is set via external interface --> set it temporay
                                    DPRINTLN(DBG_DEBUG, F("Reactivepower limit for inverter ") + String(iv->id) + F(" set to ") + String(iv->powerLimit[0]) + F("W") );
                                    iv->devControlRequest = true;
                                }
                                break;

                            // Set Power Factor
                            case PFSet: 
                                // iv->devControlCmd = PFSet;
                                // uint16_t power_factor = std::stoi(strtok(NULL, "/"));
                                DPRINTLN(DBG_INFO, F("Set Power Factor not implemented for inverter ") + String(iv->id) );
                                break;

                            // CleanState lock & alarm
                            case CleanState_LockAndAlarm: 
                                 iv->devControlCmd = CleanState_LockAndAlarm;
                                 DPRINTLN(DBG_INFO, F("CleanState lock & alarm for inverter ") + String(iv->id) );
                                 iv->devControlRequest = true;
                                 break;

                            default:
                                DPRINTLN(DBG_INFO, "Not implemented");
                                break;
                        }
                    }
                }
            }
            break;
        }
        token = strtok(NULL, "/");
    }
    DPRINTLN(DBG_INFO, F("app::cbMqtt finished"));
}


//-----------------------------------------------------------------------------
bool app::getWifiApActive(void) {
    return mWifi->getApActive();
}


//-----------------------------------------------------------------------------
void app::getAvailNetworks(JsonObject obj) {
    mWifi->getAvailNetworks(obj);
}


//-----------------------------------------------------------------------------
void app::sendMqttDiscoveryConfig(void) {
    DPRINTLN(DBG_VERBOSE, F("app::sendMqttDiscoveryConfig"));

    char stateTopic[64], discoveryTopic[64], buffer[512], name[32], uniq_id[32];
    for(uint8_t id = 0; id < mSys->getNumInverters(); id++) {
        Inverter<> *iv = mSys->getInverterByPos(id);
        if(NULL != iv) {
            record_t<> *rec = iv->getRecordStruct(RealTimeRunData_Debug);
            // TODO: next line makes no sense if discovery config is send manually by button
            //if(iv->isAvailable(mUtcTimestamp, rec) && mMqttConfigSendState[id] != true) {
                DynamicJsonDocument deviceDoc(128);
                deviceDoc["name"] = iv->name;
                deviceDoc["ids"]  = String(iv->serial.u64, HEX);
                deviceDoc["cu"]   = F("http://") + String(WiFi.localIP().toString());
                deviceDoc["mf"]   = "Hoymiles";
                deviceDoc["mdl"]  = iv->name;
                JsonObject deviceObj = deviceDoc.as<JsonObject>();
                DynamicJsonDocument doc(384);

                for(uint8_t i = 0; i < rec->length; i++) {
                    if (rec->assign[i].ch == CH0) {
                        snprintf(name, 32, "%s %s", iv->name, iv->getFieldName(i, rec));
                    } else {
                        snprintf(name, 32, "%s CH%d %s", iv->name, rec->assign[i].ch, iv->getFieldName(i, rec));
                    }
                    snprintf(stateTopic, 64, "%s/%s/ch%d/%s", mConfig.mqtt.topic, iv->name, rec->assign[i].ch, iv->getFieldName(i, rec));
                    snprintf(discoveryTopic, 64, "%s/sensor/%s/ch%d_%s/config", MQTT_DISCOVERY_PREFIX, iv->name, rec->assign[i].ch, iv->getFieldName(i, rec));
                    snprintf(uniq_id, 32, "ch%d_%s", rec->assign[i].ch, iv->getFieldName(i, rec));
                    const char* devCls = getFieldDeviceClass(rec->assign[i].fieldId);
                    const char* stateCls = getFieldStateClass(rec->assign[i].fieldId);

                    doc["name"]         = name;
                    doc["stat_t"]       = stateTopic;
                    doc["unit_of_meas"] = iv->getUnit(i, rec);
                    doc["uniq_id"]      = String(iv->serial.u64, HEX) + "_" + uniq_id;
                    doc["dev"]          = deviceObj;
                    doc["exp_aft"]      = mMqttInterval + 5; // add 5 sec if connection is bad or ESP too slow
                    if (devCls != NULL)
                        doc["dev_cla"] = devCls;
                    if (stateCls != NULL)
                        doc["stat_cla"] = stateCls;

                    serializeJson(doc, buffer);
                    mMqtt.sendMsg2(discoveryTopic, buffer, true);
                    //DPRINTLN(DBG_INFO, F("mqtt sent"));
                    doc.clear();
                }

                // TODO: remove this field, obsolete?
                mMqttConfigSendState[id] = true;

                yield();
            //}
        }
    }
}


//-----------------------------------------------------------------------------
const char* app::getFieldDeviceClass(uint8_t fieldId) {
    uint8_t pos = 0;
    for(; pos < DEVICE_CLS_ASSIGN_LIST_LEN; pos++) {
        if(deviceFieldAssignment[pos].fieldId == fieldId)
            break;
    }
    return (pos >= DEVICE_CLS_ASSIGN_LIST_LEN) ? NULL : deviceClasses[deviceFieldAssignment[pos].deviceClsId];
}


//-----------------------------------------------------------------------------
const char* app::getFieldStateClass(uint8_t fieldId) {
    uint8_t pos = 0;
    for(; pos < DEVICE_CLS_ASSIGN_LIST_LEN; pos++) {
        if(deviceFieldAssignment[pos].fieldId == fieldId)
            break;
    }
    return (pos >= DEVICE_CLS_ASSIGN_LIST_LEN) ? NULL : stateClasses[deviceFieldAssignment[pos].stateClsId];
}


//-----------------------------------------------------------------------------
void app::resetSystem(void) {
    mUptimeSecs = 0;
    mPrevMillis = 0;
    mUpdateNtp  = false;
    mFlagSendDiscoveryConfig = false;

    mNtpRefreshTicker   = 0;
    mNtpRefreshInterval = NTP_REFRESH_INTERVAL; // [ms]

#ifdef AP_ONLY
    mUtcTimestamp = 1;
#else
    mUtcTimestamp = 0;
#endif

    mHeapStatCnt = 0;

    mSendTicker     = 0xffff;
    mMqttTicker     = 0xffff;
    mMqttInterval   = MQTT_INTERVAL;
    mSerialTicker   = 0xffff;
    mMqttActive     = false;

    mTicker = 0;
    mRxTicker = 0;

    mSendLastIvId = 0;

    mShowRebootRequest = false;


    memset(mPayload, 0, (MAX_NUM_INVERTERS * sizeof(invPayload_t)));
    memset(&mStat, 0, sizeof(statistics_t));
    mLastPacketId = 0x00;
}


//-----------------------------------------------------------------------------
void app::loadDefaultConfig(void) {
    memset(&mSysConfig, 0, sizeof(sysConfig_t));
    memset(&mConfig, 0, sizeof(config_t));
    snprintf(mVersion, 12, "%d.%d.%d", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH);

    snprintf(mSysConfig.deviceName, DEVNAME_LEN, "%s", DEF_DEVICE_NAME);

    // wifi
    snprintf(mSysConfig.stationSsid, SSID_LEN, "%s", FB_WIFI_SSID);
    snprintf(mSysConfig.stationPwd, PWD_LEN, "%s", FB_WIFI_PWD);


    // nrf24
    mConfig.sendInterval      = SEND_INTERVAL;
    mConfig.maxRetransPerPyld = DEF_MAX_RETRANS_PER_PYLD;
    mConfig.pinCs             = DEF_CS_PIN;
    mConfig.pinCe             = DEF_CE_PIN;
    mConfig.pinIrq            = DEF_IRQ_PIN;
    mConfig.amplifierPower    = DEF_AMPLIFIERPOWER & 0x03;

    // ntp
    snprintf(mConfig.ntpAddr, NTP_ADDR_LEN, "%s", DEF_NTP_SERVER_NAME);
    mConfig.ntpPort = DEF_NTP_PORT;

    // Latitude + Longitude
    mConfig.sunLat = 0.0;
    mConfig.sunLon = 0.0;
    mConfig.sunDisNightCom = false;

    // mqtt
    snprintf(mConfig.mqtt.broker, MQTT_ADDR_LEN, "%s", DEF_MQTT_BROKER);
    mConfig.mqtt.port = DEF_MQTT_PORT;
    snprintf(mConfig.mqtt.user, MQTT_USER_LEN, "%s", DEF_MQTT_USER);
    snprintf(mConfig.mqtt.pwd, MQTT_PWD_LEN, "%s", DEF_MQTT_PWD);
    snprintf(mConfig.mqtt.topic, MQTT_TOPIC_LEN, "%s", DEF_MQTT_TOPIC);

    // serial
    mConfig.serialInterval = SERIAL_INTERVAL;
    mConfig.serialShowIv   = false;
    mConfig.serialDebug    = false;

    // Disclaimer
    mConfig.disclaimer = false;
}


//-----------------------------------------------------------------------------
void app::loadEEpconfig(void) {
    DPRINTLN(DBG_VERBOSE, F("app::loadEEpconfig"));

    if(mWifiSettingsValid)
        mEep->read(ADDR_CFG_SYS, (uint8_t*) &mSysConfig, CFG_SYS_LEN);
    if(mSettingsValid) {
        mEep->read(ADDR_CFG, (uint8_t*) &mConfig, CFG_LEN);

        mSendTicker   = mConfig.sendInterval;
        mSerialTicker = 0;

        // inverter
        uint64_t invSerial;
        char name[MAX_NAME_LENGTH + 1] = {0};
        uint16_t modPwr[4];
        Inverter<> *iv;
        for(uint8_t i = 0; i < MAX_NUM_INVERTERS; i ++) {
            mEep->read(ADDR_INV_ADDR + (i * 8),               &invSerial);
            mEep->read(ADDR_INV_NAME + (i * MAX_NAME_LENGTH), name, MAX_NAME_LENGTH);
            mEep->read(ADDR_INV_CH_PWR + (i * 2 * 4),         modPwr, 4);
            if(0ULL != invSerial) {
                iv = mSys->addInverter(name, invSerial, modPwr);
                if(NULL != iv) { // will run once on every dtu boot
                    for(uint8_t j = 0; j < 4; j++) {
                        mEep->read(ADDR_INV_CH_NAME + (i * 4 * MAX_NAME_LENGTH) + j * MAX_NAME_LENGTH, iv->chName[j], MAX_NAME_LENGTH);
                    }
                }

                // TODO: the original mqttinterval value is not needed any more
                mMqttInterval += mConfig.sendInterval;
            }
        }

        for(uint8_t i = 0; i < MAX_NUM_INVERTERS; i++) {
            iv = mSys->getInverterByPos(i, false);
            if(NULL != iv)
                resetPayload(iv);
        }
    }
}


//-----------------------------------------------------------------------------
void app::saveValues(void) {
    DPRINTLN(DBG_VERBOSE, F("app::saveValues"));

    mEep->write(ADDR_CFG_SYS, (uint8_t*)&mSysConfig, CFG_SYS_LEN);
    mEep->write(ADDR_CFG, (uint8_t*)&mConfig, CFG_LEN);
    Inverter<> *iv;
    for(uint8_t i = 0; i < MAX_NUM_INVERTERS; i ++) {
        iv = mSys->getInverterByPos(i, false);
        mEep->write(ADDR_INV_ADDR + (i * 8), iv->serial.u64);
        mEep->write(ADDR_INV_NAME + (i * MAX_NAME_LENGTH), iv->name, MAX_NAME_LENGTH);
        // max channel power / name
        for(uint8_t j = 0; j < 4; j++) {
            mEep->write(ADDR_INV_CH_PWR + (i * 2 * 4) + (j*2), iv->chMaxPwr[j]);
            mEep->write(ADDR_INV_CH_NAME + (i * 4 * MAX_NAME_LENGTH) + j * MAX_NAME_LENGTH, iv->chName[j], MAX_NAME_LENGTH);
        }
    }

    updateCrc();

    // update sun
    mLatestSunTimestamp = 0;
}


//-----------------------------------------------------------------------------
void app::setupMqtt(void) {
    if(mSettingsValid) {
        if(mConfig.mqtt.broker[0] > 0) {
            mMqttActive = true;
            if(mMqttInterval < MIN_MQTT_INTERVAL) mMqttInterval = MIN_MQTT_INTERVAL;
        } else {
            mMqttInterval = 0xffff;
        }

        mMqttTicker = 0;
        mMqtt.setup(&mConfig.mqtt, mSysConfig.deviceName);
        mMqtt.setCallback(std::bind(&app::cbMqtt, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));


        if(mMqttActive) {
            mMqtt.sendMsg("version", mVersion);
            if(mMqtt.isConnected()) {
                mMqtt.sendMsg("device", mSysConfig.deviceName);
                mMqtt.sendMsg("uptime", "0");
            }
        }
    }
}

//-----------------------------------------------------------------------------
void app::resetPayload(Inverter<>* iv) {
    DPRINTLN(DBG_INFO, "resetPayload: id: " + String(iv->id));
    memset(mPayload[iv->id].len, 0, MAX_PAYLOAD_ENTRIES);
    mPayload[iv->id].txCmd       = 0;
    mPayload[iv->id].retransmits = 0;
    mPayload[iv->id].maxPackId   = 0;
    mPayload[iv->id].complete    = false;
    mPayload[iv->id].requested   = false;
    mPayload[iv->id].ts          = mUtcTimestamp;
}

void app::calculateSunriseSunset() {
    // Source: https://en.wikipedia.org/wiki/Sunrise_equation#Complete_calculation_on_Earth

    // Julian day since 1.1.2000 12:00 + correction 69.12s
    double n_JulianDay = (mUtcTimestamp + mCalculatedTimezoneOffset) / 86400 - 10957.0 + 0.0008;
    // Mean solar time
    double J = n_JulianDay - mConfig.sunLon / 360;
    // Solar mean anomaly
    double M = fmod((357.5291 + 0.98560028 * J), 360);
    // Equation of the center
    double C = 1.9148 * SIN(M) + 0.02 * SIN(2 * M) + 0.0003 * SIN(3 * M);
    // Ecliptic longitude
    double lambda = fmod((M + C + 180 + 102.9372), 360);
    // Solar transit
    double Jtransit = 2451545.0 + J + 0.0053 * SIN(M) - 0.0069 * SIN(2 * lambda);
    // Declination of the sun
    double delta = ASIN(SIN(lambda) * SIN(23.44));
    // Hour angle
    double omega = ACOS(SIN(-0.83) - SIN(mConfig.sunLat) * SIN(delta) / COS(mConfig.sunLat) * COS(delta));
    // Calculate sunrise and sunset
    double Jrise = Jtransit - omega / 360;
    double Jset  = Jtransit + omega / 360;
    // Julian sunrise/sunset to UTC unix timestamp (days incl. fraction to seconds + unix offset 1.1.2000 12:00)
    mSunrise = (Jrise - 2451545.0) * 86400 + 946728000; // OPTIONAL: Add an offset of +-seconds to the end of the line
    mSunset  = (Jset  - 2451545.0) * 86400 + 946728000; // OPTIONAL: Add an offset of +-seconds to the end of the line
}