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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtBluetooth/qlowenergyadvertisingdata.h>
#include <QtBluetooth/qlowenergyadvertisingparameters.h>
#include <QtBluetooth/qlowenergycharacteristic.h>
#include <QtBluetooth/qlowenergycharacteristicdata.h>
#include <QtBluetooth/qlowenergydescriptordata.h>
#include <QtBluetooth/qlowenergycontroller.h>
#include <QtBluetooth/qlowenergyservice.h>
#include <QtBluetooth/qlowenergyservicedata.h>
#include <QtCore/qbytearray.h>
#ifndef Q_OS_ANDROID
#include <QtCore/qcoreapplication.h>
#else
#include <QtGui/qguiapplication.h>
#endif
#include <QtCore/qlist.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qscopedpointer.h>
#include <QtCore/qtimer.h>
int main(int argc, char *argv[])
{
// QLoggingCategory::setFilterRules(QStringLiteral("qt.bluetooth* = true"));
#ifndef Q_OS_ANDROID
QCoreApplication app(argc, argv);
#else
QGuiApplication app(argc, argv);
#endif
//! [Advertising Data]
QLowEnergyAdvertisingData advertisingData;
advertisingData.setDiscoverability(QLowEnergyAdvertisingData::DiscoverabilityGeneral);
advertisingData.setIncludePowerLevel(true);
advertisingData.setLocalName("HeartRateServer");
advertisingData.setServices(QList<QBluetoothUuid>() << QBluetoothUuid::ServiceClassUuid::HeartRate);
//! [Advertising Data]
//! [Service Data]
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);
//! [Service Data]
//! [Start Advertising]
const QScopedPointer<QLowEnergyController> leController(QLowEnergyController::createPeripheral());
QScopedPointer<QLowEnergyService> service(leController->addService(serviceData));
leController->startAdvertising(QLowEnergyAdvertisingParameters(), advertisingData,
advertisingData);
//! [Start Advertising]
//! [Provide Heartbeat]
QTimer heartbeatTimer;
quint8 currentHeartRate = 60;
enum ValueChange { ValueUp, ValueDown } valueChange = ValueUp;
const auto heartbeatProvider = [&service, ¤tHeartRate, &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);
//! [Provide Heartbeat]
auto reconnect = [&leController, advertisingData, &service, serviceData]()
{
service.reset(leController->addService(serviceData));
if (!service.isNull())
leController->startAdvertising(QLowEnergyAdvertisingParameters(),
advertisingData, advertisingData);
};
QObject::connect(leController.data(), &QLowEnergyController::disconnected, reconnect);
return app.exec();
}
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