10.3 Rio Bluetooth not working on macOS Mojave?

10.3 Rio Bluetooth not working on macOS Mojave?

Hi,
I tried all BlueTooth examples available with 10.3 Rio on my Mac (Xcode 10.1) but none of the them, compiled to Windows or macOS, work.
Each time I click the scan button to list all available BlueTooth devices, I get a dialog box stating:
Error
BlueTooth device not found: disconnected or turned off.

My BlueTooth card on my Mac is turned on and fully functional. 
Can anybody here use BlueTooth functionalities with Rio 10.3 on a Mojave macOS machine with Xcode 10.1? Or do you face the same problem?
Thanks for any help.
Steve