EspNow with Arduino IDE ???? How ??? Tutorial ??? Documentation ??

[ramaker]

I want to make a communication between 2 M5StickC devices or between a M5StickC and a M5Stack Fire.
In UIFlow there are function blocks for EspNow.

How can I make these functions with the Arduino IDE ?
I found documentation for the Arduino IDE, but only for basic components not for the rest. I'm sure, that anywere on GitHub there are files fo documentation -- but where ?

Are there any tutorials for EspNow ?

I want to do something like the RoverC and the JoyC are doing, but I have to use different hardware for the vehicle. I want to use to JoyC to control my vehicle.

(I'm a starter - so maybe my question is solved anyware - but I looked and found nothing, what seems to help.)

K.D.