API regarding FCC testing

[nh-esp32]

Happy new year all!

I see that Espressif provides binary image along with windows tools to accommodate FCC testing for WiFi and Bluetooth of its product. Is there any supporting APIs so that I can develop my own custom firmware for FCC testing? Please be noted that we have other RF radios in our product, so we need to develop custom firmware to conduct co-existence tests among multiple radios.

I appreciate your time and support. Thank you.

-/Nazmul