- Qt 5.5
- Qt Bluetooth
- Bluetooth Low Energy Heart Listener Example
- heartrate.h Example File
- Qt 5.5.1 Reference Documentation

# heartrate.h Example File

heartlistener/heartrate.h

    /***************************************************************************
    **
    ** Copyright (C) 2014 BlackBerry Limited. All rights reserved.
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the QtBluetooth module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #ifndef HEARTRATE_H
    #define HEARTRATE_H

    #include "deviceinfo.h"

    #include <QString>
    #include <QDebug>
    #include <QDateTime>
    #include <QVector>
    #include <QTimer>
    #include <QBluetoothDeviceDiscoveryAgent>
    #include <QBluetoothDeviceInfo>
    #include <QLowEnergyController>
    #include <QLowEnergyService>

    QT_USE_NAMESPACE
    class HeartRate: public QObject
    {
        Q_OBJECT
        Q_PROPERTY(QVariant name READ name NOTIFY nameChanged)
        Q_PROPERTY(QString message READ message NOTIFY messageChanged)
        Q_PROPERTY(int hr READ hR NOTIFY hrChanged)
        Q_PROPERTY(int maxHR READ maxHR NOTIFY averageChanged)
        Q_PROPERTY(int minHR READ minHR NOTIFY averageChanged)
        Q_PROPERTY(float average READ average NOTIFY averageChanged)
        Q_PROPERTY(int time READ time NOTIFY timeChanged)
        Q_PROPERTY(float calories READ caloriesCalculation NOTIFY caloriesChanged)

    public:
        HeartRate();
        ~HeartRate();
        void setMessage(QString message);
        QString message() const;
        QVariant name();
        int hR() const;
        int time();
        float average();
        int maxHR() const;
        int minHR() const;
        float caloriesCalculation();

    public slots:
        void deviceSearch();
        void connectToService(const QString &address);
        void disconnectService();
        void startDemo();

        void obtainResults();
        int measurements(int index) const;
        int measurementsSize() const;
        QString deviceAddress() const;
        int numDevices() const;

    private slots:
        //QBluetothDeviceDiscoveryAgent
        void addDevice(const QBluetoothDeviceInfo&);
        void scanFinished();
        void deviceScanError(QBluetoothDeviceDiscoveryAgent::Error);

        //QLowEnergyController
        void serviceDiscovered(const QBluetoothUuid &);
        void serviceScanDone();
        void controllerError(QLowEnergyController::Error);
        void deviceConnected();
        void deviceDisconnected();

        //QLowEnergyService
        void serviceStateChanged(QLowEnergyService::ServiceState s);
        void updateHeartRateValue(const QLowEnergyCharacteristic &c,
                                  const QByteArray &value);
        void confirmedDescriptorWrite(const QLowEnergyDescriptor &d,
                                  const QByteArray &value);
        void serviceError(QLowEnergyService::ServiceError e);

        //DemoMode
        void receiveDemo();

    Q_SIGNALS:
        void messageChanged();
        void nameChanged();
        void hrChanged();
        void averageChanged();
        void timeChanged();
        void caloriesChanged();

    private:
        int randomPulse() const;

        DeviceInfo m_currentDevice;
        QBluetoothDeviceDiscoveryAgent *m_deviceDiscoveryAgent;
        QLowEnergyDescriptor m_notificationDesc;
        QList<QObject*> m_devices;
        QString m_info;
        bool foundHeartRateService;
        QVector<quint16> m_measurements;
        QDateTime m_start;
        QDateTime m_stop;
        int m_max;
        int m_min;
        float calories;
        QLowEnergyController *m_control;
        QTimer *timer; // for demo application
        QLowEnergyService *m_service;
    };

    #endif // HEARTRATE_H