sdrangel/plugins/channelrx/demodvorsc/vordemodsc.cpp

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015-2018 Edouard Griffiths, F4EXB.                             //
// Copyright (C) 2020 Jon Beniston, M7RCE                                        //
//                                                                               //
// This program is free software; you can redistribute it and/or modify          //
// it under the terms of the GNU General Public License as published by          //
// the Free Software Foundation as version 3 of the License, or                  //
// (at your option) any later version.                                           //
//                                                                               //
// This program is distributed in the hope that it will be useful,               //
// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
// GNU General Public License V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#include <QTime>
#include <QDebug>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QBuffer>
#include <QThread>

#include <stdio.h>
#include <complex.h>

#include "SWGChannelSettings.h"
#include "SWGVORDemodSettings.h"
#include "SWGChannelReport.h"
#include "SWGVORDemodReport.h"

#include "dsp/dspengine.h"
#include "dsp/dspcommands.h"
#include "device/deviceapi.h"
#include "feature/feature.h"
#include "util/db.h"
#include "maincore.h"

#include "vordemodscreport.h"
#include "vordemodsc.h"

MESSAGE_CLASS_DEFINITION(VORDemodSC::MsgConfigureVORDemod, Message)

const char * const VORDemodSC::m_channelIdURI = "sdrangel.channel.vordemodsc";
const char * const VORDemodSC::m_channelId = "VORDemodSC";

VORDemodSC::VORDemodSC(DeviceAPI *deviceAPI) :
        ChannelAPI(m_channelIdURI, ChannelAPI::StreamSingleSink),
        m_deviceAPI(deviceAPI),
        m_basebandSampleRate(0)
{
    setObjectName(m_channelId);

    m_basebandSink = new VORDemodSCBaseband();
    m_basebandSink->setMessageQueueToChannel(getInputMessageQueue());
    m_basebandSink->moveToThread(&m_thread);

    applySettings(m_settings, true);

    m_deviceAPI->addChannelSink(this);
    m_deviceAPI->addChannelSinkAPI(this);

    m_networkManager = new QNetworkAccessManager();
    connect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
}

VORDemodSC::~VORDemodSC()
{
    qDebug("VORDemodSC::~VORDemodSC");
    disconnect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
    delete m_networkManager;
    m_deviceAPI->removeChannelSinkAPI(this);
    m_deviceAPI->removeChannelSink(this);

    if (m_basebandSink->isRunning()) {
        stop();
    }

    delete m_basebandSink;
}

uint32_t VORDemodSC::getNumberOfDeviceStreams() const
{
    return m_deviceAPI->getNbSourceStreams();
}

void VORDemodSC::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
{
    (void) firstOfBurst;
    m_basebandSink->feed(begin, end);
}

void VORDemodSC::start()
{
    qDebug("VORDemodSC::start");

    m_basebandSink->reset();
    m_basebandSink->startWork();
    m_thread.start();

    DSPSignalNotification *dspMsg = new DSPSignalNotification(m_basebandSampleRate, m_centerFrequency);
    m_basebandSink->getInputMessageQueue()->push(dspMsg);

    VORDemodSCBaseband::MsgConfigureVORDemodBaseband *msg = VORDemodSCBaseband::MsgConfigureVORDemodBaseband::create(m_settings, true);
    m_basebandSink->getInputMessageQueue()->push(msg);
}

void VORDemodSC::stop()
{
    qDebug("VORDemodSC::stop");
    m_basebandSink->stopWork();
    m_thread.quit();
    m_thread.wait();
}

bool VORDemodSC::handleMessage(const Message& cmd)
{
    if (MsgConfigureVORDemod::match(cmd))
    {
        MsgConfigureVORDemod& cfg = (MsgConfigureVORDemod&) cmd;
        qDebug() << "VORDemodSC::handleMessage: MsgConfigureVORDemod";
        applySettings(cfg.getSettings(), cfg.getForce());

        return true;
    }
    else if (DSPSignalNotification::match(cmd))
    {
        DSPSignalNotification& notif = (DSPSignalNotification&) cmd;
        m_basebandSampleRate = notif.getSampleRate();
        m_centerFrequency = notif.getCenterFrequency();
        // Forward to the sink
        DSPSignalNotification* rep = new DSPSignalNotification(notif); // make a copy
        qDebug() << "VORDemodSC::handleMessage: DSPSignalNotification";
        m_basebandSink->getInputMessageQueue()->push(rep);
        // Forward to GUI if any
        if (m_guiMessageQueue)
        {
            rep = new DSPSignalNotification(notif);
            m_guiMessageQueue->push(rep);
        }

        return true;
    }
    else if (VORDemodSCReport::MsgReportRadial::match(cmd))
    {
        VORDemodSCReport::MsgReportRadial& report = (VORDemodSCReport::MsgReportRadial&) cmd;
        m_radial = report.getRadial();
        m_refMag = report.getRefMag();
        m_varMag = report.getVarMag();

        if (m_guiMessageQueue)
        {
            VORDemodSCReport::MsgReportRadial *msg = new VORDemodSCReport::MsgReportRadial(report);
            m_guiMessageQueue->push(msg);
        }

        MessagePipes& messagePipes = MainCore::instance()->getMessagePipes();
        QList<MessageQueue*> *reportMessageQueues = messagePipes.getMessageQueues(this, "report");

        if (reportMessageQueues) {
            sendChannelReport(reportMessageQueues);
        }

        return true;
    }
    else if (VORDemodSCReport::MsgReportIdent::match(cmd))
    {
        VORDemodSCReport::MsgReportIdent& report = (VORDemodSCReport::MsgReportIdent&) cmd;
        m_morseIdent = report.getIdent();

        if (m_guiMessageQueue)
        {
            VORDemodSCReport::MsgReportIdent *msg = new VORDemodSCReport::MsgReportIdent(report);
            m_guiMessageQueue->push(msg);
        }

        MessagePipes& messagePipes = MainCore::instance()->getMessagePipes();
        QList<MessageQueue*> *reportMessageQueues = messagePipes.getMessageQueues(this, "report");

        if (reportMessageQueues) {
            sendChannelReport(reportMessageQueues);
        }

        return true;
    }
    else
    {
        return false;
    }
}

void VORDemodSC::applySettings(const VORDemodSCSettings& settings, bool force)
{
    qDebug() << "VORDemodSC::applySettings:"
            << " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
            << " m_navId: " << settings.m_navId
            << " m_volume: " << settings.m_volume
            << " m_squelch: " << settings.m_squelch
            << " m_audioMute: " << settings.m_audioMute
            << " m_audioDeviceName: " << settings.m_audioDeviceName
            << " m_streamIndex: " << settings.m_streamIndex
            << " m_useReverseAPI: " << settings.m_useReverseAPI
            << " m_reverseAPIAddress: " << settings.m_reverseAPIAddress
            << " m_reverseAPIPort: " << settings.m_reverseAPIPort
            << " m_reverseAPIDeviceIndex: " << settings.m_reverseAPIDeviceIndex
            << " m_reverseAPIChannelIndex: " << settings.m_reverseAPIChannelIndex
            << " force: " << force;

    QList<QString> reverseAPIKeys;

    if ((m_settings.m_inputFrequencyOffset != settings.m_inputFrequencyOffset) || force) {
        reverseAPIKeys.append("inputFrequencyOffset");
    }
    if ((m_settings.m_navId != settings.m_navId) || force) {
        reverseAPIKeys.append("navId");
    }
    if ((m_settings.m_squelch != settings.m_squelch) || force) {
        reverseAPIKeys.append("squelch");
    }
    if ((settings.m_audioDeviceName != m_settings.m_audioDeviceName) || force) {
        reverseAPIKeys.append("audioDeviceName");
    }

    if ((m_settings.m_audioMute != settings.m_audioMute) || force) {
        reverseAPIKeys.append("audioMute");
    }

    if ((m_settings.m_volume != settings.m_volume) || force) {
        reverseAPIKeys.append("volume");
    }

    if (m_settings.m_streamIndex != settings.m_streamIndex)
    {
        if (m_deviceAPI->getSampleMIMO()) // change of stream is possible for MIMO devices only
        {
            m_deviceAPI->removeChannelSinkAPI(this);
            m_deviceAPI->removeChannelSink(this, m_settings.m_streamIndex);
            m_deviceAPI->addChannelSink(this, settings.m_streamIndex);
            m_deviceAPI->addChannelSinkAPI(this);
        }

        reverseAPIKeys.append("streamIndex");
    }

    if ((m_settings.m_identThreshold != settings.m_identThreshold) || force) {
        reverseAPIKeys.append("identThreshold");
    }

    VORDemodSCBaseband::MsgConfigureVORDemodBaseband *msg = VORDemodSCBaseband::MsgConfigureVORDemodBaseband::create(settings, force);
    m_basebandSink->getInputMessageQueue()->push(msg);

    if (settings.m_useReverseAPI)
    {
        bool fullUpdate = ((m_settings.m_useReverseAPI != settings.m_useReverseAPI) && settings.m_useReverseAPI) ||
                (m_settings.m_reverseAPIAddress != settings.m_reverseAPIAddress) ||
                (m_settings.m_reverseAPIPort != settings.m_reverseAPIPort) ||
                (m_settings.m_reverseAPIDeviceIndex != settings.m_reverseAPIDeviceIndex) ||
                (m_settings.m_reverseAPIChannelIndex != settings.m_reverseAPIChannelIndex);
        webapiReverseSendSettings(reverseAPIKeys, settings, fullUpdate || force);
    }

    QList<MessageQueue*> *messageQueues = MainCore::instance()->getMessagePipes().getMessageQueues(this, "settings");

    if (messageQueues) {
        sendChannelSettings(messageQueues, reverseAPIKeys, settings, force);
    }

    m_settings = settings;
}

QByteArray VORDemodSC::serialize() const
{
    return m_settings.serialize();
}

bool VORDemodSC::deserialize(const QByteArray& data)
{
    if (m_settings.deserialize(data))
    {
        MsgConfigureVORDemod *msg = MsgConfigureVORDemod::create(m_settings, true);
        m_inputMessageQueue.push(msg);
        return true;
    }
    else
    {
        m_settings.resetToDefaults();
        MsgConfigureVORDemod *msg = MsgConfigureVORDemod::create(m_settings, true);
        m_inputMessageQueue.push(msg);
        return false;
    }
}

int VORDemodSC::webapiSettingsGet(
        SWGSDRangel::SWGChannelSettings& response,
        QString& errorMessage)
{
    (void) errorMessage;
    response.setVorDemodScSettings(new SWGSDRangel::SWGVORDemodSCSettings());
    response.getVorDemodScSettings()->init();
    webapiFormatChannelSettings(response, m_settings);
    return 200;
}

int VORDemodSC::webapiSettingsPutPatch(
        bool force,
        const QStringList& channelSettingsKeys,
        SWGSDRangel::SWGChannelSettings& response,
        QString& errorMessage)
{
    (void) errorMessage;
    VORDemodSCSettings settings = m_settings;
    webapiUpdateChannelSettings(settings, channelSettingsKeys, response);

    MsgConfigureVORDemod *msg = MsgConfigureVORDemod::create(settings, force);
    m_inputMessageQueue.push(msg);

    qDebug("VORDemodSC::webapiSettingsPutPatch: forward to GUI: %p", m_guiMessageQueue);
    if (m_guiMessageQueue) // forward to GUI if any
    {
        MsgConfigureVORDemod *msgToGUI = MsgConfigureVORDemod::create(settings, force);
        m_guiMessageQueue->push(msgToGUI);
    }

    webapiFormatChannelSettings(response, settings);

    return 200;
}

void VORDemodSC::webapiUpdateChannelSettings(
        VORDemodSCSettings& settings,
        const QStringList& channelSettingsKeys,
        SWGSDRangel::SWGChannelSettings& response)
{
    if (channelSettingsKeys.contains("inputFrequencyOffset")) {
        settings.m_inputFrequencyOffset = response.getVorDemodScSettings()->getInputFrequencyOffset();
    }
    if (channelSettingsKeys.contains("navId")) {
        settings.m_navId = response.getVorDemodScSettings()->getNavId();
    }
    if (channelSettingsKeys.contains("audioMute")) {
        settings.m_audioMute = response.getVorDemodScSettings()->getAudioMute() != 0;
    }
    if (channelSettingsKeys.contains("rgbColor")) {
        settings.m_rgbColor = response.getVorDemodScSettings()->getRgbColor();
    }
    if (channelSettingsKeys.contains("squelch")) {
        settings.m_squelch = response.getVorDemodScSettings()->getSquelch();
    }
    if (channelSettingsKeys.contains("title")) {
        settings.m_title = *response.getVorDemodScSettings()->getTitle();
    }
    if (channelSettingsKeys.contains("volume")) {
        settings.m_volume = response.getVorDemodScSettings()->getVolume();
    }
    if (channelSettingsKeys.contains("audioDeviceName")) {
        settings.m_audioDeviceName = *response.getVorDemodScSettings()->getAudioDeviceName();
    }

    if (channelSettingsKeys.contains("streamIndex")) {
        settings.m_streamIndex = response.getVorDemodScSettings()->getStreamIndex();
    }
    if (channelSettingsKeys.contains("useReverseAPI")) {
        settings.m_useReverseAPI = response.getVorDemodScSettings()->getUseReverseApi() != 0;
    }
    if (channelSettingsKeys.contains("reverseAPIAddress")) {
        settings.m_reverseAPIAddress = *response.getVorDemodScSettings()->getReverseApiAddress();
    }
    if (channelSettingsKeys.contains("reverseAPIPort")) {
        settings.m_reverseAPIPort = response.getVorDemodScSettings()->getReverseApiPort();
    }
    if (channelSettingsKeys.contains("reverseAPIDeviceIndex")) {
        settings.m_reverseAPIDeviceIndex = response.getVorDemodScSettings()->getReverseApiDeviceIndex();
    }
    if (channelSettingsKeys.contains("reverseAPIChannelIndex")) {
        settings.m_reverseAPIChannelIndex = response.getVorDemodScSettings()->getReverseApiChannelIndex();
    }
    if (channelSettingsKeys.contains("identThreshold")) {
        settings.m_identThreshold = response.getVorDemodScSettings()->getIdentThreshold();
    }
}

int VORDemodSC::webapiReportGet(
        SWGSDRangel::SWGChannelReport& response,
        QString& errorMessage)
{
    (void) errorMessage;
    response.setVorDemodScReport(new SWGSDRangel::SWGVORDemodSCReport());
    response.getVorDemodScReport()->init();
    webapiFormatChannelReport(response);
    return 200;
}

void VORDemodSC::webapiFormatChannelSettings(SWGSDRangel::SWGChannelSettings& response, const VORDemodSCSettings& settings)
{
    response.getVorDemodScSettings()->setInputFrequencyOffset(settings.m_inputFrequencyOffset);
    response.getVorDemodScSettings()->setNavId(settings.m_navId);
    response.getVorDemodScSettings()->setAudioMute(settings.m_audioMute ? 1 : 0);
    response.getVorDemodScSettings()->setRgbColor(settings.m_rgbColor);
    response.getVorDemodScSettings()->setSquelch(settings.m_squelch);
    response.getVorDemodScSettings()->setVolume(settings.m_volume);

    if (response.getVorDemodScSettings()->getTitle()) {
        *response.getVorDemodScSettings()->getTitle() = settings.m_title;
    } else {
        response.getVorDemodScSettings()->setTitle(new QString(settings.m_title));
    }

    if (response.getVorDemodScSettings()->getAudioDeviceName()) {
        *response.getVorDemodScSettings()->getAudioDeviceName() = settings.m_audioDeviceName;
    } else {
        response.getVorDemodScSettings()->setAudioDeviceName(new QString(settings.m_audioDeviceName));
    }

    response.getVorDemodScSettings()->setStreamIndex(settings.m_streamIndex);
    response.getVorDemodScSettings()->setUseReverseApi(settings.m_useReverseAPI ? 1 : 0);

    if (response.getVorDemodScSettings()->getReverseApiAddress()) {
        *response.getVorDemodScSettings()->getReverseApiAddress() = settings.m_reverseAPIAddress;
    } else {
        response.getVorDemodScSettings()->setReverseApiAddress(new QString(settings.m_reverseAPIAddress));
    }

    response.getVorDemodScSettings()->setReverseApiPort(settings.m_reverseAPIPort);
    response.getVorDemodScSettings()->setReverseApiDeviceIndex(settings.m_reverseAPIDeviceIndex);
    response.getVorDemodScSettings()->setReverseApiChannelIndex(settings.m_reverseAPIChannelIndex);

    response.getVorDemodScSettings()->setIdentThreshold(settings.m_identThreshold);
}

void VORDemodSC::webapiFormatChannelReport(SWGSDRangel::SWGChannelReport& response)
{
    double magsqAvg, magsqPeak;
    int nbMagsqSamples;
    getMagSqLevels(magsqAvg, magsqPeak, nbMagsqSamples);

    response.getVorDemodScReport()->setChannelPowerDb(CalcDb::dbPower(magsqAvg));
    response.getVorDemodScReport()->setSquelch(m_basebandSink->getSquelchOpen() ? 1 : 0);
    response.getVorDemodScReport()->setAudioSampleRate(m_basebandSink->getAudioSampleRate());
    response.getVorDemodScReport()->setNavId(m_settings.m_navId);
    response.getVorDemodScReport()->setRadial(m_radial);
    response.getVorDemodScReport()->setRefMag(m_refMag);
    response.getVorDemodScReport()->setVarMag(m_varMag);
    float refMagDB = std::round(20.0*std::log10(m_refMag));
    float varMagDB = std::round(20.0*std::log10(m_varMag));
    bool validRefMag = refMagDB > m_settings.m_refThresholdDB;
    bool validVarMag = varMagDB > m_settings.m_varThresholdDB;
    response.getVorDemodScReport()->setValidRadial(validRefMag && validVarMag ? 1 : 0);
    response.getVorDemodScReport()->setValidRefMag(validRefMag ? 1 : 0);
    response.getVorDemodScReport()->setValidVarMag(validVarMag ? 1 : 0);

    if (response.getVorDemodScReport()->getMorseIdent()) {
        *response.getVorDemodScReport()->getMorseIdent() = m_morseIdent;
    } else {
        response.getVorDemodScReport()->setMorseIdent(new QString(m_morseIdent));
    }
}

void VORDemodSC::webapiReverseSendSettings(QList<QString>& channelSettingsKeys, const VORDemodSCSettings& settings, bool force)
{
    SWGSDRangel::SWGChannelSettings *swgChannelSettings = new SWGSDRangel::SWGChannelSettings();
    webapiFormatChannelSettings(channelSettingsKeys, swgChannelSettings, settings, force);

    QString channelSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/channel/%4/settings")
            .arg(settings.m_reverseAPIAddress)
            .arg(settings.m_reverseAPIPort)
            .arg(settings.m_reverseAPIDeviceIndex)
            .arg(settings.m_reverseAPIChannelIndex);
    m_networkRequest.setUrl(QUrl(channelSettingsURL));
    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");

    QBuffer *buffer = new QBuffer();
    buffer->open((QBuffer::ReadWrite));
    buffer->write(swgChannelSettings->asJson().toUtf8());
    buffer->seek(0);

    // Always use PATCH to avoid passing reverse API settings
    QNetworkReply *reply = m_networkManager->sendCustomRequest(m_networkRequest, "PATCH", buffer);
    buffer->setParent(reply);

    delete swgChannelSettings;
}

void VORDemodSC::sendChannelSettings(
    QList<MessageQueue*> *messageQueues,
    QList<QString>& channelSettingsKeys,
    const VORDemodSCSettings& settings,
    bool force)
{
    QList<MessageQueue*>::iterator it = messageQueues->begin();

    for (; it != messageQueues->end(); ++it)
    {
        SWGSDRangel::SWGChannelSettings *swgChannelSettings = new SWGSDRangel::SWGChannelSettings();
        webapiFormatChannelSettings(channelSettingsKeys, swgChannelSettings, settings, force);
        MainCore::MsgChannelSettings *msg = MainCore::MsgChannelSettings::create(
            this,
            channelSettingsKeys,
            swgChannelSettings,
            force
        );
        (*it)->push(msg);
    }
}

void VORDemodSC::sendChannelReport(QList<MessageQueue*> *messageQueues)
{
    QList<MessageQueue*>::iterator it = messageQueues->begin();

    for (; it != messageQueues->end(); ++it)
    {
        SWGSDRangel::SWGChannelReport *swgChannelReport = new SWGSDRangel::SWGChannelReport();
        swgChannelReport->setDirection(0);
        swgChannelReport->setChannelType(new QString(m_channelId));
        swgChannelReport->setVorDemodScReport(new SWGSDRangel::SWGVORDemodSCReport());
        webapiFormatChannelReport(*swgChannelReport);
        MainCore::MsgChannelReport *msg = MainCore::MsgChannelReport::create(this, swgChannelReport);
        (*it)->push(msg);
    }
}

void VORDemodSC::webapiFormatChannelSettings(
        QList<QString>& channelSettingsKeys,
        SWGSDRangel::SWGChannelSettings *swgChannelSettings,
        const VORDemodSCSettings& settings,
        bool force
)
{
    swgChannelSettings->setDirection(0); // Single sink (Rx)
    swgChannelSettings->setOriginatorChannelIndex(getIndexInDeviceSet());
    swgChannelSettings->setOriginatorDeviceSetIndex(getDeviceSetIndex());
    swgChannelSettings->setChannelType(new QString("VORDemodSC"));
    swgChannelSettings->setVorDemodScSettings(new SWGSDRangel::SWGVORDemodSCSettings());
    SWGSDRangel::SWGVORDemodSCSettings *swgVORDemodSCSettings = swgChannelSettings->getVorDemodScSettings();

    // transfer data that has been modified. When force is on transfer all data except reverse API data

    if (channelSettingsKeys.contains("inputFrequencyOffset") || force) {
        swgVORDemodSCSettings->setInputFrequencyOffset(settings.m_inputFrequencyOffset);
    }
    if (channelSettingsKeys.contains("navId") || force) {
        swgVORDemodSCSettings->setNavId(settings.m_navId);
    }
    if (channelSettingsKeys.contains("audioMute") || force) {
        swgVORDemodSCSettings->setAudioMute(settings.m_audioMute ? 1 : 0);
    }
    if (channelSettingsKeys.contains("rgbColor") || force) {
        swgVORDemodSCSettings->setRgbColor(settings.m_rgbColor);
    }
    if (channelSettingsKeys.contains("squelch") || force) {
        swgVORDemodSCSettings->setSquelch(settings.m_squelch);
    }
    if (channelSettingsKeys.contains("title") || force) {
        swgVORDemodSCSettings->setTitle(new QString(settings.m_title));
    }
    if (channelSettingsKeys.contains("volume") || force) {
        swgVORDemodSCSettings->setVolume(settings.m_volume);
    }
    if (channelSettingsKeys.contains("audioDeviceName") || force) {
        swgVORDemodSCSettings->setAudioDeviceName(new QString(settings.m_audioDeviceName));
    }
    if (channelSettingsKeys.contains("streamIndex") || force) {
        swgVORDemodSCSettings->setStreamIndex(settings.m_streamIndex);
    }
    if (channelSettingsKeys.contains("identThreshold") || force) {
        swgVORDemodSCSettings->setAudioMute(settings.m_identThreshold);
    }
}

void VORDemodSC::networkManagerFinished(QNetworkReply *reply)
{
    QNetworkReply::NetworkError replyError = reply->error();

    if (replyError)
    {
        qWarning() << "VORDemodSC::networkManagerFinished:"
                << " error(" << (int) replyError
                << "): " << replyError
                << ": " << reply->errorString();
    }
    else
    {
        QString answer = reply->readAll();
        answer.chop(1); // remove last \n
        qDebug("VORDemodSC::networkManagerFinished: reply:\n%s", answer.toStdString().c_str());
    }

    reply->deleteLater();
}