https://forum.qt.io/topic/58766/qbluetoothdevicediscoveryagent-and-duplicates/4
QBluetoothDeviceDiscoveryAgent and duplicates | Qt Forum
Sep 10, 2015 - AFAIK, no, it looks rather like a problem of user permission, your standard user is not allowed to do the scanning
duplicatesqtforum
https://doc.qt.io/qt-6.5/qbluetoothdevicediscoveryagent.html
QBluetoothDeviceDiscoveryAgent Class | Qt Bluetooth 6.5.12
The QBluetoothDeviceDiscoveryAgent class discovers the Bluetooth devices nearby.
classqtbluetooth