Learn how to setup the ESP 32 BLE bluetooth low energy and using it in client and notify mode. Full tutorial with step by step on how to use ESP32
Does your board work in Arduino for such BLE examples ?
Yes. BLE works fine but Classic BT isn't implemented. I did not expect that ('till then to me "all" modern BT-chips can do BT, maybe as a plus BLE).
Just made an example using the Arduino example code (inline C) and Erel's BLE example
Works fine. Are you interested in it? Will upload it then.
Using Wifi or SPIFF with BLE seems to be a problem on all ESP's (see my thread in the B4R-questions forum). Even using SPIFFS+BLE crashes the ESP.