devicefinder.cpp Example File

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 #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(nullptr);
     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.isEmpty())
         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 = nullptr;
     for (QObject *entry : qAsConst(m_devices)) {
         auto device = qobject_cast<DeviceInfo *>(entry);
         if (device && device->getAddress() == address ) {
             currentDevice = device;
             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);
 }