블루투스 저에너지 심박수 서버

auto permissionStatus = app.checkPermission(QBluetoothPermission{});

if (permissionStatus== == Qt::PermissionStatus::Undetermined) {    qInfo("Requesting Bluetooth permission ...");
    app.requestPermission(QBluetoothPermission{}, [&permissionStatus](const QPermission &permission){        qApp->exit();
        permissionStatus = permission.status(); }); // 이제 권한 요청이 해결될 때까지 기다립니다.app.exec(); }

QLowEnergyAdvertisingData advertisingData;
advertisingData.setDiscoverability(QLowEnergyAdvertisingData::DiscoverabilityGeneral);
advertisingData.setIncludePowerLevel(true);
advertisingData.setLocalName("HeartRateServer");
advertisingData.setServices(QList<QBluetoothUuid>() << QBluetoothUuid::ServiceClassUuid::HeartRate);

QLowEnergyCharacteristicData charData;
charData.setUuid(QBluetoothUuid::CharacteristicType::HeartRateMeasurement);
charData.setValue(QByteArray(2, 0));
charData.setProperties(QLowEnergyCharacteristic::Notify);
const QLowEnergyDescriptorData clientConfig(QBluetoothUuid::DescriptorType::ClientCharacteristicConfiguration,
                                            QByteArray(2, 0));
charData.addDescriptor(clientConfig);

QLowEnergyServiceData serviceData;
serviceData.setType(QLowEnergyServiceData::ServiceTypePrimary);
serviceData.setUuid(QBluetoothUuid::ServiceClassUuid::HeartRate);
serviceData.addCharacteristic(charData);

bool errorOccurred = false;const std::unique_ptr<QLowEnergyController> leController(QLowEnergyController::createPeripheral());auto errorHandler = [&leController, &errorOccurred](QLowEnergyController::오류 errorCode) {        qWarning().noquote().nospace() << errorCode << " occurred: "
           <<  leController->errorString(); if (errorCode ! =() QLowEnergyController::RemoteHostClosedError) {            qWarning("Heartrate-server quitting due to the error.");
            errorOccurred = true;     QCoreApplication::quit(); } } };QObject::connect(leController.get(), &QLowEnergyController::errorOccurred, errorHandler); std::unique_ptr<QLowEnergyService> service(leController->addService(serviceData));  leController->startAdvertising(QLowEnergyAdvertisingParameters(), advertisingData,advertisingData);if (errorOccurred) return-1;

QTimer heartbeatTimer;
quint8 currentHeartRate = 60;
enum ValueChange { ValueUp, ValueDown } valueChange = ValueUp;
const auto heartbeatProvider = [&service, &currentHeartRate, &valueChange]() {
    QByteArray value;
    value.append(char(0)); // Flags that specify the format of the value.
    value.append(char(currentHeartRate)); // Actual value.
    QLowEnergyCharacteristic characteristic
            = service->characteristic(QBluetoothUuid::CharacteristicType::HeartRateMeasurement);
    Q_ASSERT(characteristic.isValid());
    service->writeCharacteristic(characteristic, value); // Potentially causes notification.
    if (currentHeartRate == 60)
        valueChange = ValueUp;
    else if (currentHeartRate == 100)
        valueChange = ValueDown;
    if (valueChange == ValueUp)
        ++currentHeartRate;
    else
        --currentHeartRate;
};
QObject::connect(&heartbeatTimer, &QTimer::timeout, heartbeatProvider);
heartbeatTimer.start(1000);