Discovery and Pair-ity – search and connect for BLE devices

The first thing you need to do is search for devices, which is called discovery. It entails putting the Bluetooth device into search, or discovery mode. You then receive a list of devices address with which you can connect or pair to be able to access and share data.

Let's look at how that is done in Qt using QBluetoothDeviceDiscoveryAgent.

QBluetoothDeviceDiscoveryAgent

The QBluetoothDeviceDiscoveryAgent class is responsible for the device discovery search. It will emit the deviceDiscovered signal when any Bluetooth is found:

QBluetoothDeviceDiscoveryAgent *discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this...