开云体育

Hi Vaclav -

I am planning to add Bluetooth USB dongle ( hardware) to MY NanoVNA, including
necessary software.

Unless you find a Bluetooth dongle that supports USB OTG, I think that this is doomed.
I found no 64-pin STM32 chip, as in nanoVNAs, that does USB OTG,
/g/nanovna-users/message/5373

...resulting in a classic "failure to communicate".