Once you have connected to a BLE device peripheral, you need to discover its characteristics to be able to read and write them. You do that by using QLowEnergyController. Let's take a look at what QLowEnergyController is.
QLowEnergyController is the central place to access BLE devices both local and remote.
The local QLowEnergyController can be created by using the static QLowEnergyController::createPeripheral(QObject *parent) function.
Creating a QLowEnergyController object that represents the remote device is done by calling the static class QLowEnergyController::createCentral using the QBluetoothDeviceInfo object that you receive when you discover remote devices.
The QLowEnergyController object has several signals:
discoveryFinishedserviceDiscoveredconnecteddisconnected
Connect to the connected signal and start connecting by calling connectToDevice():
SomeClass::newDevice(const QBluetoothDeviceInfo &device)
{
QLowEnergyController...