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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
//! [include]
#include <QtBluetooth/QBluetoothLocalDevice>
//! [include]
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtCore/QFile>
#include <QtCore/QObject>
#include <QtBluetooth/QBluetoothDeviceDiscoveryAgent>
#include <QtBluetooth/QBluetoothServiceDiscoveryAgent>
#include <QtBluetooth/QLowEnergyController>
#include <QtBluetooth/QLowEnergyService>
#include <QtBluetooth/QLowEnergyCharacteristic>
//! [namespace]
QT_USE_NAMESPACE
//! [namespace]
class MyClass : public QObject
{
Q_OBJECT
public:
MyClass() : QObject() {}
void localDevice();
void startDeviceDiscovery();
void startServiceDiscovery();
void objectPush();
void btleSharedData();
void enableCharNotifications();
public slots:
void deviceDiscovered(const QBluetoothDeviceInfo &device);
void serviceDiscovered(const QBluetoothServiceInfo &service);
void characteristicChanged(const QLowEnergyCharacteristic& ,const QByteArray&);
};
void MyClass::localDevice() {
//! [turningon]
QBluetoothLocalDevice localDevice;
QString localDeviceName;
// Check if Bluetooth is available on this device
if (localDevice.isValid()) {
// Turn Bluetooth on
localDevice.powerOn();
// Read local device name
localDeviceName = localDevice.name();
// Make it visible to others
localDevice.setHostMode(QBluetoothLocalDevice::HostDiscoverable);
// Get connected devices
QList<QBluetoothAddress> remotes;
remotes = localDevice.connectedDevices();
}
//! [turningon]
}
//! [device_discovery]
void MyClass::startDeviceDiscovery()
{
// Create a discovery agent and connect to its signals
QBluetoothDeviceDiscoveryAgent *discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),
this, SLOT(deviceDiscovered(QBluetoothDeviceInfo)));
// Start a discovery
discoveryAgent->start();
//...
}
// In your local slot, read information about the found devices
void MyClass::deviceDiscovered(const QBluetoothDeviceInfo &device)
{
qDebug() << "Found new device:" << device.name() << '(' << device.address().toString() << ')';
}
//! [device_discovery]
//! [service_discovery]
void MyClass::startServiceDiscovery()
{
// Create a discovery agent and connect to its signals
QBluetoothServiceDiscoveryAgent *discoveryAgent = new QBluetoothServiceDiscoveryAgent(this);
connect(discoveryAgent, SIGNAL(serviceDiscovered(QBluetoothServiceInfo)),
this, SLOT(serviceDiscovered(QBluetoothServiceInfo)));
// Start a discovery
discoveryAgent->start();
//...
}
// In your local slot, read information about the found devices
void MyClass::serviceDiscovered(const QBluetoothServiceInfo &service)
{
qDebug() << "Found new service:" << service.serviceName()
<< '(' << service.device().address().toString() << ')';
}
//! [service_discovery]
void MyClass::characteristicChanged(const QLowEnergyCharacteristic &, const QByteArray &)
{
}
void MyClass::btleSharedData()
{
QBluetoothDeviceInfo remoteDevice;
//! [data_share_qlowenergyservice]
QLowEnergyService *first, *second;
QLowEnergyController control(remoteDevice);
control.connectToDevice();
// waiting for connection
first = control.createServiceObject(QBluetoothUuid::ServiceClassUuid::BatteryService);
second = control.createServiceObject(QBluetoothUuid::ServiceClassUuid::BatteryService);
Q_ASSERT(first->state() == QLowEnergyService::RemoteService);
Q_ASSERT(first->state() == second->state());
first->discoverDetails();
Q_ASSERT(first->state() == QLowEnergyService::RemoteServiceDiscovering);
Q_ASSERT(first->state() == second->state());
//! [data_share_qlowenergyservice]
}
void MyClass::enableCharNotifications()
{
QBluetoothDeviceInfo remoteDevice;
QLowEnergyService *service;
QLowEnergyController *control = QLowEnergyController::createCentral(remoteDevice, this);
control->connectToDevice();
service = control->createServiceObject(QBluetoothUuid::ServiceClassUuid::BatteryService, this);
if (!service)
return;
service->discoverDetails();
//... wait until discovered
//! [enable_btle_notifications]
//PreCondition: service details already discovered
QLowEnergyCharacteristic batteryLevel = service->characteristic(
QBluetoothUuid::CharacteristicType::BatteryLevel);
if (!batteryLevel.isValid())
return;
QLowEnergyDescriptor notification = batteryLevel.descriptor(
QBluetoothUuid::DescriptorType::ClientCharacteristicConfiguration);
if (!notification.isValid())
return;
// establish hook into notifications
connect(service, SIGNAL(characteristicChanged(QLowEnergyCharacteristic,QByteArray)),
this, SLOT(characteristicChanged(QLowEnergyCharacteristic,QByteArray)));
// enable notification
service->writeDescriptor(notification, QByteArray::fromHex("0100"));
// disable notification
//service->writeDescriptor(notification, QByteArray::fromHex("0000"));
// wait until descriptorWritten() signal is emitted
// to confirm successful write
//! [enable_btle_notifications]
}
int main(int argc, char** argv)
{
QCoreApplication app(argc, argv);
MyClass cl;
return app.exec();
}
#include "doc_src_qtbluetooth.moc"
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