Well it's to do some thing similar to the serialEvent event from the hardwareserial library. Basically, call a function in the sketch from a library when some uartwifi data has been treated and ready to be catch.
Ok, so i'm happy to know that I can change that name, I was suspecting that it meanted "pointer to fonction" i found it in the analog button on this site, but it was also all over the net. Personally, i would prefere to use XY or something that mean nothing, then that hiphop langage. So yeah, I will use some significant naming for sure.
Any ways it's good, cause I might have more then one event to trigger, and that seem limiting in the way it was declared.
Mk, thank you once again PaulS