Have you tried my code (changing pin number pin in NRF) using OTG instead of Bluetooth?
- App (adapt to OTG) p9AAi_bluetooth_radiofrecuencia.aia
Radio Frequency modules. Arduino. Bluetooth HC-06. FM - #6 by Juan_Antonio - Code Arduino.
Have you tried my code (changing pin number pin in NRF) using OTG instead of Bluetooth?