device.cpp Example File

lowenergyscanner/device.cpp
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#include "device.h" #include <qbluetoothaddress.h> #include <qbluetoothdevicediscoveryagent.h> #include <qbluetoothlocaldevice.h> #include <qbluetoothdeviceinfo.h> #include <qbluetoothservicediscoveryagent.h> #include <QDebug> #include <QList> #include <QTimer> Device::Device(): connected(false), controller(0), m_deviceScanState(false), randomAddress(false) { discoveryAgent = new QBluetoothDeviceDiscoveryAgent(); discoveryAgent->setLowEnergyDiscoveryTimeout(5000); connect(discoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this, &Device::addDevice); connect(discoveryAgent, QOverload<QBluetoothDeviceDiscoveryAgent::Error>::of(&QBluetoothDeviceDiscoveryAgent::error), this, &Device::deviceScanError); connect(discoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished, this, &Device::deviceScanFinished); setUpdate("Search"); } Device::~Device() { delete discoveryAgent; delete controller; qDeleteAll(devices); qDeleteAll(m_services); qDeleteAll(m_characteristics); devices.clear(); m_services.clear(); m_characteristics.clear(); } void Device::startDeviceDiscovery() { qDeleteAll(devices); devices.clear(); emit devicesUpdated(); setUpdate("Scanning for devices ..."); discoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod); if (discoveryAgent->isActive()) { m_deviceScanState = true; Q_EMIT stateChanged(); } } void Device::addDevice(const QBluetoothDeviceInfo &info) { if (info.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) { DeviceInfo *d = new DeviceInfo(info); devices.append(d); setUpdate("Last device added: " + d->getName()); } } void Device::deviceScanFinished() { emit devicesUpdated(); m_deviceScanState = false; emit stateChanged(); if (devices.isEmpty()) setUpdate("No Low Energy devices found..."); else setUpdate("Done! Scan Again!"); } QVariant Device::getDevices() { return QVariant::fromValue(devices); } QVariant Device::getServices() { return QVariant::fromValue(m_services); } QVariant Device::getCharacteristics() { return QVariant::fromValue(m_characteristics); } QString Device::getUpdate() { return m_message; } void Device::scanServices(const QString &address) { // We need the current device for service discovery. for (int i = 0; i < devices.size(); i++) { if (((DeviceInfo*)devices.at(i))->getAddress() == address ) currentDevice.setDevice(((DeviceInfo*)devices.at(i))->getDevice()); } if (!currentDevice.getDevice().isValid()) { qWarning() << "Not a valid device"; return; } qDeleteAll(m_characteristics); m_characteristics.clear(); emit characteristicsUpdated(); qDeleteAll(m_services); m_services.clear(); emit servicesUpdated(); setUpdate("Back\n(Connecting to device...)"); if (controller && m_previousAddress != currentDevice.getAddress()) { controller->disconnectFromDevice(); delete controller; controller = 0; } if (!controller) { // Connecting signals and slots for connecting to LE services. controller = new QLowEnergyController(currentDevice.getDevice()); connect(controller, &QLowEnergyController::connected, this, &Device::deviceConnected); connect(controller, QOverload<QLowEnergyController::Error>::of(&QLowEnergyController::error), this, &Device::errorReceived); connect(controller, &QLowEnergyController::disconnected, this, &Device::deviceDisconnected); connect(controller, &QLowEnergyController::serviceDiscovered, this, &Device::addLowEnergyService); connect(controller, &QLowEnergyController::discoveryFinished, this, &Device::serviceScanDone); } if (isRandomAddress()) controller->setRemoteAddressType(QLowEnergyController::RandomAddress); else controller->setRemoteAddressType(QLowEnergyController::PublicAddress); controller->connectToDevice(); m_previousAddress = currentDevice.getAddress(); } void Device::addLowEnergyService(const QBluetoothUuid &serviceUuid) { QLowEnergyService *service = controller->createServiceObject(serviceUuid); if (!service) { qWarning() << "Cannot create service for uuid"; return; } ServiceInfo *serv = new ServiceInfo(service); m_services.append(serv); emit servicesUpdated(); } void Device::serviceScanDone() { setUpdate("Back\n(Service scan done!)"); // force UI in case we didn't find anything if (m_services.isEmpty()) emit servicesUpdated(); } void Device::connectToService(const QString &uuid) { QLowEnergyService *service = 0; for (int i = 0; i < m_services.size(); i++) { ServiceInfo *serviceInfo = (ServiceInfo*)m_services.at(i); if (serviceInfo->getUuid() == uuid) { service = serviceInfo->service(); break; } } if (!service) return; qDeleteAll(m_characteristics); m_characteristics.clear(); emit characteristicsUpdated(); if (service->state() == QLowEnergyService::DiscoveryRequired) { connect(service, &QLowEnergyService::stateChanged, this, &Device::serviceDetailsDiscovered); service->discoverDetails(); setUpdate("Back\n(Discovering details...)"); return; } //discovery already done const QList<QLowEnergyCharacteristic> chars = service->characteristics(); foreach (const QLowEnergyCharacteristic &ch, chars) { CharacteristicInfo *cInfo = new CharacteristicInfo(ch); m_characteristics.append(cInfo); } QTimer::singleShot(0, this, &Device::characteristicsUpdated); } void Device::deviceConnected() { setUpdate("Back\n(Discovering services...)"); connected = true; controller->discoverServices(); } void Device::errorReceived(QLowEnergyController::Error /*error*/) { qWarning() << "Error: " << controller->errorString(); setUpdate(QString("Back\n(%1)").arg(controller->errorString())); } void Device::setUpdate(QString message) { m_message = message; emit updateChanged(); } void Device::disconnectFromDevice() { // UI always expects disconnect() signal when calling this signal // TODO what is really needed is to extend state() to a multi value // and thus allowing UI to keep track of controller progress in addition to // device scan progress if (controller->state() != QLowEnergyController::UnconnectedState) controller->disconnectFromDevice(); else deviceDisconnected(); } void Device::deviceDisconnected() { qWarning() << "Disconnect from device"; emit disconnected(); } void Device::serviceDetailsDiscovered(QLowEnergyService::ServiceState newState) { if (newState != QLowEnergyService::ServiceDiscovered) { // do not hang in "Scanning for characteristics" mode forever // in case the service discovery failed // We have to queue the signal up to give UI time to even enter // the above mode if (newState != QLowEnergyService::DiscoveringServices) { QMetaObject::invokeMethod(this, "characteristicsUpdated", Qt::QueuedConnection); } return; } QLowEnergyService *service = qobject_cast<QLowEnergyService *>(sender()); if (!service) return; const QList<QLowEnergyCharacteristic> chars = service->characteristics(); foreach (const QLowEnergyCharacteristic &ch, chars) { CharacteristicInfo *cInfo = new CharacteristicInfo(ch); m_characteristics.append(cInfo); } emit characteristicsUpdated(); } void Device::deviceScanError(QBluetoothDeviceDiscoveryAgent::Error error) { if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError) setUpdate("The Bluetooth adaptor is powered off, power it on before doing discovery."); else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError) setUpdate("Writing or reading from the device resulted in an error."); else setUpdate("An unknown error has occurred."); m_deviceScanState = false; emit devicesUpdated(); emit stateChanged(); } bool Device::state() { return m_deviceScanState; } bool Device::hasControllerError() const { if (controller && controller->error() != QLowEnergyController::NoError) return true; return false; } bool Device::isRandomAddress() const { return randomAddress; } void Device::setRandomAddress(bool newValue) { randomAddress = newValue; emit randomAddressChanged(); }

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