373 lines
12 KiB
C++
373 lines
12 KiB
C++
#include "qbluetoothleuart.h"
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QBluetoothLeUart::QBluetoothLeUart(QObject *parent) : QObject(parent)
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{
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currentBluetoothDevice = nullptr;
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bluetoothController = nullptr;
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bluetoothService = nullptr;
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state = Idle;
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this->setUUIDs("6e400001-b5a3-f393-e0a9-e50e24dcca9e", "6e400002-b5a3-f393-e0a9-e50e24dcca9e", "6e400003-b5a3-f393-e0a9-e50e24dcca9e");
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// init device discovery agent for scanning
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this->bluetoothDeviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
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connect(this->bluetoothDeviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this, &QBluetoothLeUart::handleDeviceDiscovered);
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connect(bluetoothDeviceDiscoveryAgent, SIGNAL(error(QBluetoothDeviceDiscoveryAgent::Error)),
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this, SLOT(handleDeviceScanError(QBluetoothDeviceDiscoveryAgent::Error)));
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connect(this->bluetoothDeviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished, this, &QBluetoothLeUart::handleScanFinished);
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// device model for QML
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this->availableDevicesModel = new QBluetoothLeUartDeviceModel(this->availableDevices, this);
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}
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QBluetoothLeUart::~QBluetoothLeUart(){
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}
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// ------------------------------
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// - Slots for QBluetoothLeUart -
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// ------------------------------
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bool QBluetoothLeUart::startScanningForDevices(){
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if(this->state != Idle && this->state != ScanFinished)
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return false;
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this->availableDevicesModel->clear();
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foreach(QBluetoothLeUartDevice* oldDevice, this->availableDevices)
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oldDevice->deleteLater();
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this->availableDevices.clear();
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this->setState(Scanning);
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this->bluetoothDeviceDiscoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);
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return true;
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}
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bool QBluetoothLeUart::stopScanningForDevices() {
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if(this->state != Scanning)
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return false;
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this->bluetoothDeviceDiscoveryAgent->stop();
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this->setState(ScanFinished);
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return true;
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}
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QList<QBluetoothLeUartDevice*> QBluetoothLeUart::getAvailableDevices() {
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return this->availableDevices;
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}
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QVariantList QBluetoothLeUart::getAvailableDevicesDetailList() {
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QVariantList result;
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for(int i=0; i < this->availableDevices.length(); i++) {
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if(this->availableDevices[i]->getName().isEmpty())
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continue;
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QVariantMap device;
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device.insert("id", i);
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device.insert("name", this->availableDevices[i]->getName());
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device.insert("address", this->availableDevices[i]->getAddress());
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result.append(device);
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}
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return result;
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}
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QBluetoothLeUartDeviceModel* QBluetoothLeUart::getAvailableDevicesModel() {
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return this->availableDevicesModel;
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}
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QBluetoothLeUartDevice* QBluetoothLeUart::getCurrentDevice() {
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return this->currentBluetoothDevice;
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}
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bool QBluetoothLeUart::connectToDevice(int deviceId) {
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if(deviceId < 0 || deviceId >= this->availableDevices.length())
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return false;
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this->connectToDevice(this->availableDevices[deviceId]);
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return true;
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}
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bool QBluetoothLeUart::connectToDevice(QBluetoothLeUartDevice *device){
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if(!this->availableDevices.contains(device))
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return false;
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if(this->state == Scanning)
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this->stopScanningForDevices();
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this->currentBluetoothDevice = device;
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emit this->currentDeviceChanged();
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if (bluetoothController) {
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bluetoothController->disconnectFromDevice();
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delete bluetoothController;
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bluetoothController = 0;
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}
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// initialize QLowEnergyController
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bluetoothController = new QLowEnergyController(currentBluetoothDevice->getDevice(), this);
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bluetoothController->setRemoteAddressType(QLowEnergyController::RandomAddress);
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connect(this->bluetoothController, &QLowEnergyController::serviceDiscovered, this, &QBluetoothLeUart::handleServiceDiscovered);
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connect(this->bluetoothController, &QLowEnergyController::discoveryFinished, this, &QBluetoothLeUart::handleServiceScanDone);
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connect(bluetoothController, SIGNAL(error(QLowEnergyController::Error)),
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this, SLOT(handleControllerError(QLowEnergyController::Error)));
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connect(this->bluetoothController, &QLowEnergyController::connected, this, &QBluetoothLeUart::handleDeviceConnected);
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connect(this->bluetoothController, &QLowEnergyController::disconnected, this, &QBluetoothLeUart::handleDeviceDisconnected);
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/* Start connecting to device */
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bluetoothController->connectToDevice();
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setState(Connecting);
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return true;
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}
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bool QBluetoothLeUart::disconnectFromDevice() {
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if(this->state < Connecting)
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return false;
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if(this->state >= Connected)
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this->bluetoothController->disconnectFromDevice();
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this->bluetoothController->deleteLater();
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this->bluetoothController = nullptr;
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if(this->bluetoothService != nullptr) {
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this->bluetoothService->deleteLater();
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this->bluetoothService = nullptr;
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}
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this->currentBluetoothDevice->deleteLater();
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this->currentBluetoothDevice = nullptr;
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emit this->currentDeviceChanged();
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this->setState(Idle);
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return true;
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}
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bool QBluetoothLeUart::sendData(QString data, bool asynchronous){
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Q_UNUSED(asynchronous)
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if(this->state != Connected)
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return false;
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const QLowEnergyCharacteristic RxChar = bluetoothService->characteristic(QBluetoothUuid(QUuid(this->txUUID)));
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QByteArray Data;
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Data.append(data);
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bluetoothService->writeCharacteristic(RxChar, Data, QLowEnergyService::WriteWithoutResponse);
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return true;
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}
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// -------------------------------------------
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// - Slots for QBluetothDeviceDiscoveryAgent -
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// -------------------------------------------
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void QBluetoothLeUart::handleDeviceDiscovered(const QBluetoothDeviceInfo &device)
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{
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// Is it a BLE device?
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if (device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) {
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qWarning() << "Discovered BLE Device: name: " << device.name() << " Address: " << device.address().toString() << " UUIDs: " << device.serviceUuids();
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// ignore all devices that to not support our service
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if(!device.serviceUuids().contains(QBluetoothUuid(this->uartServiceUUID)))
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return;
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QBluetoothLeUartDevice *dev = new QBluetoothLeUartDevice(device, this);
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this->availableDevices.append(dev);
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this->availableDevicesModel->append(dev);
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emit this->foundNewDevice(dev);
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emit this->avaliableDevicesChanged(this->availableDevices);
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}
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}
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void QBluetoothLeUart::handleScanFinished()
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{
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if (this->availableDevices.size() == 0)
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{
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qWarning() << "No Low Energy devices found";
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}
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emit this->scanFinished(this->availableDevices);
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setState(ScanFinished);
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}
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void QBluetoothLeUart::handleDeviceScanError(QBluetoothDeviceDiscoveryAgent::Error error)
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{
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if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError)
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emit this->scanningErrorOccured(AdapterTurnedOffError);
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else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError)
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emit this->scanningErrorOccured(InputOutputError);
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else
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emit this->scanningErrorOccured(UnknownError);
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}
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// ----------------------------------
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// - Slots for QLowEnergyController -
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// ----------------------------------
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void QBluetoothLeUart::handleServiceDiscovered(const QBluetoothUuid &uuid){
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qDebug() << "Found service with ID: " << uuid;
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if(uuid == QBluetoothUuid(QUuid(this->uartServiceUUID))){
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foundValidUARTService =true;
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qDebug() << "UART service found!";
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}
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}
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void QBluetoothLeUart::handleServiceScanDone(){
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delete bluetoothService;
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bluetoothService=0;
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if(foundValidUARTService){
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qDebug() << "Connecting to UART service...";
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bluetoothService = bluetoothController->createServiceObject(QBluetoothUuid(QUuid(this->uartServiceUUID)),this);
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}
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if(!bluetoothService){
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qDebug() <<"UART service not found";
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this->disconnectFromDevice();
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return;
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}
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/* 3 Step: Service Discovery */
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connect(this->bluetoothService, &QLowEnergyService::stateChanged, this, &QBluetoothLeUart::handleServiceStateChange);
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connect(this->bluetoothService, &QLowEnergyService::characteristicChanged, this, &QBluetoothLeUart::handleServiceCharacteristicChange);
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connect(this->bluetoothService, &QLowEnergyService::descriptorWritten, this, &QBluetoothLeUart::handleServiceDescriptorWritten);
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bluetoothService->discoverDetails();
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setState(ServiceFound);
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}
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void QBluetoothLeUart::handleControllerError(QLowEnergyController::Error error)
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{
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qDebug() << "Cannot connect to remote device.";
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qWarning() << "Controller Error:" << error;
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this->disconnectFromDevice();
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}
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void QBluetoothLeUart::handleDeviceConnected()
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{
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qDebug() << "Device connected";
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bluetoothController->discoverServices();
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setState(ScanningForService);
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}
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void QBluetoothLeUart::handleDeviceDisconnected()
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{
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this->setState(Idle);
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qDebug() << "UART service disconnected";
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qWarning() << "Remote device disconnected";
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}
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// -------------------------------
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// - Slots for QLowEnergyService -
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// -------------------------------
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void QBluetoothLeUart::handleServiceStateChange(QLowEnergyService::ServiceState s)
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{
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// A descriptoc can only be written if the service is in the ServiceDiscovered state
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switch (s) {
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case QLowEnergyService::ServiceDiscovered:
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{
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//looking for the RX characteristic
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const QLowEnergyCharacteristic TxChar = bluetoothService->characteristic(QBluetoothUuid(QUuid(this->rxUUID)));
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if (!TxChar.isValid()){
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qDebug() << "Rx characteristic not found";
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this->disconnectFromDevice();
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return;
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}
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//looking for the TX characteristic
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const QLowEnergyCharacteristic RxChar = bluetoothService->characteristic(QBluetoothUuid(QUuid(this->txUUID)));
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if (!RxChar.isValid()) {
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qDebug() << "Tx characteristic not found";
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this->disconnectFromDevice();
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return;
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}
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// Bluetooth LE spec Where a characteristic can be notified, a Client Characteristic Configuration descriptor
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// shall be included in that characteristic as required by the Bluetooth Core Specification
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// Tx notify is enabled
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const QLowEnergyDescriptor m_notificationDescTx = TxChar.descriptor(QBluetoothUuid::ClientCharacteristicConfiguration);
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if (m_notificationDescTx.isValid()) {
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// enable notification
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bluetoothService->writeDescriptor(m_notificationDescTx, QByteArray::fromHex("0100"));
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setState(Connected);
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emit this->connectedToDevice();
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}
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break;
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}
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default:
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//nothing for now
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break;
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}
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}
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void QBluetoothLeUart::handleServiceCharacteristicChange(const QLowEnergyCharacteristic &c,const QByteArray &value)
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{
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// ignore any other characteristic change
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if (c.uuid() != QBluetoothUuid(QUuid(this->rxUUID)))
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return;
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emit dataReceived((QString) value);
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}
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void QBluetoothLeUart::handleServiceDescriptorWritten(const QLowEnergyDescriptor &d,
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const QByteArray &value)
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{
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if (d.isValid() && d == bluetoothTransmissionDescriptor && value == QByteArray("0000")) {
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//disabled notifications -> assume disconnect intent
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this->disconnectFromDevice();
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}
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}
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// --------------------
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// - Helper functions -
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// --------------------
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void QBluetoothLeUart::init() {
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#ifdef QBluetoothLeUart_QML
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qmlRegisterUncreatableType<QBluetoothLeUartDevice>("de.itsblue.bluetoothleuart", 1, 0, "QBluetoothLeUartDevice", "QBluetoothLeUartDevice cannot be created");
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qmlRegisterUncreatableType<QBluetoothLeUartDeviceModel>("de.itsblue.bluetoothleuart", 1, 0, "QBluetoothLeUartDeviceModel", "QBluetoothLeUartDeviceModel cannot be created");
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qmlRegisterType<QBluetoothLeUart>("de.itsblue.bluetoothleuart", 1, 0, "QBluetoothLeUart");
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qRegisterMetaType<QBluetoothLeUart::BluetoothLeUartState>("QBluetoothLeUart::BluetoothLeUartState");
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qRegisterMetaType<QBluetoothLeUart::BluetoothScanError>("QBluetoothLeUart::BluetoothScanError");
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#endif
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}
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void QBluetoothLeUart::setState(QBluetoothLeUart::BluetoothLeUartState newState)
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{
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if (state == newState)
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return;
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state = newState;
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emit stateChanged(newState);
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}
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QBluetoothLeUart::BluetoothLeUartState QBluetoothLeUart::getState() const {
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return state;
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}
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void QBluetoothLeUart::setUUIDs(const char uartServiceUUID[36], const char txUUID[36], const char rxUUID[36]) {
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this->uartServiceUUID = uartServiceUUID;
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this->txUUID = txUUID;
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this->rxUUID = rxUUID;
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}
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