Thank you, another question, if I want to do this but I’m programming with Arduino IDE using the ESP32 libraries, how I can do it using this?

Hi world. My question is how I get the adress of my device if this is connected to my ESP 32 , my ESP 32 is working like a server and my phone is a client, when you do a sacan you get the adress of the BLE devices around of the ESP 32, I want to get this adress and then when my device was disconnect...