How to configure NimBLE "earphone-like" for easy pairing with android? Example?

[resuSover]

Hi all,
I have a esp32 dev board (using arduino framework) without display or any sort of inputs which I am trying to connect to Android Phone (with RPA) in a style of "earphones". This means that in normal mode it can only allow connection of bonded phones (only one allowed), but when user presses a button on ESP32 for 3 seconds it enters "pairing" mode which allows new device to be bonded. Once bonded, esp32 board goes to normal advertising to bonded only.

But no matter what I do, this bonding does not happen... Is there an example of such standard functionality (virtually all earphones use that)?

Additional info: I can see device in the list of devices available for pairing on my android, and when I press on it it shows a simple dialogue with Pair/Cancel buttons. I press Pair. But all the logs on EPS32 show me that bonding was not successful and the number of bonded devices is 0.

[h2zero]

Can you share the log output and a snippet of your code?