devicefinder.cpp Example File

/***************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the QtBluetooth module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "devicefinder.h"
#include "devicehandler.h"
#include "deviceinfo.h"

DeviceFinder::DeviceFinder(DeviceHandler *handler, QObject *parent):
    BluetoothBaseClass(parent),
    m_deviceHandler(handler)
{
    m_deviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
    m_deviceDiscoveryAgent->setLowEnergyDiscoveryTimeout(5000);

    connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this, &DeviceFinder::addDevice);
    connect(m_deviceDiscoveryAgent, static_cast<void (QBluetoothDeviceDiscoveryAgent::*)(QBluetoothDeviceDiscoveryAgent::Error)>(&QBluetoothDeviceDiscoveryAgent::error),
            this, &DeviceFinder::scanError);

    connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished, this, &DeviceFinder::scanFinished);
    connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::canceled, this, &DeviceFinder::scanFinished);

#ifdef SIMULATOR
    m_demoTimer.setSingleShot(true);
    m_demoTimer.setInterval(2000);
    connect(&m_demoTimer, &QTimer::timeout, this, &DeviceFinder::scanFinished);
#endif
}

DeviceFinder::~DeviceFinder()
{
    qDeleteAll(m_devices);
    m_devices.clear();
}

void DeviceFinder::startSearch()
{
    clearMessages();
    m_deviceHandler->setDevice(0);
    qDeleteAll(m_devices);
    m_devices.clear();

    emit devicesChanged();

#ifdef SIMULATOR
    m_demoTimer.start();
#else
    m_deviceDiscoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);
#endif
    emit scanningChanged();
    setInfo(tr("Scanning for devices..."));
}

void DeviceFinder::addDevice(const QBluetoothDeviceInfo &device)
{
    // If device is LowEnergy-device, add it to the list
    if (device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) {
        m_devices.append(new DeviceInfo(device));
        setInfo(tr("Low Energy device found. Scanning more..."));
        emit devicesChanged();
    }
    //...
}

void DeviceFinder::scanError(QBluetoothDeviceDiscoveryAgent::Error error)
{
    if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError)
        setError(tr("The Bluetooth adaptor is powered off."));
    else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError)
        setError(tr("Writing or reading from the device resulted in an error."));
    else
        setError(tr("An unknown error has occurred."));
}

void DeviceFinder::scanFinished()
{
#ifdef SIMULATOR
    // Only for testing
    for (int i = 0; i < 4; i++)
        m_devices.append(new DeviceInfo(QBluetoothDeviceInfo()));
#endif

    if (m_devices.size() == 0)
        setError(tr("No Low Energy devices found."));
    else
        setInfo(tr("Scanning done."));

    emit scanningChanged();
    emit devicesChanged();
}

void DeviceFinder::connectToService(const QString &address)
{
    m_deviceDiscoveryAgent->stop();

    DeviceInfo *currentDevice = 0;
    for (int i = 0; i < m_devices.size(); i++) {
        if (((DeviceInfo*)m_devices.at(i))->getAddress() == address ) {
            currentDevice = (DeviceInfo*)m_devices.at(i);
            break;
        }
    }

    if (currentDevice)
        m_deviceHandler->setDevice(currentDevice);

    clearMessages();
}

bool DeviceFinder::scanning() const
{
#ifdef SIMULATOR
    return m_demoTimer.isActive();
#else
    return m_deviceDiscoveryAgent->isActive();
#endif
}

QVariant DeviceFinder::devices()
{
    return QVariant::fromValue(m_devices);
}