Fipy HSP Bluetooth
I've been searching for HSP Bluetooth profile examples and API (micropython api), but it seems it's not available. May I use in this case C??
This is indeed not directly built into the micropython firmware. You could implement it in C using the ESP-IDF, but we cannot give you in-depth support for that. There do exist some examples over on the espressif esp-idf repository on github that you can look at