softAP: how to allow only known clients to connect ?

[beta-tester]

hi,

i am quite new on ESP32 Arduino. i want to setup my ESP32 as access point and found some example code.
but there all clients (STA) will be accepted to connect to the ESP32 (AP), when they know the ssid and password of the AP.

WiFiAccessPoint.ino

how can i accept only clients (STA) with a known MAC address and reject all other clients (STA), even they use the correct ssid/password?
is there something after `Wifi.softAP(..)` where i can accept or reject clients (STA) from connecting to the softAP (AP)?