please Help to find information about function

Hi, I’m trying to use existing programm code for my own purpose but can’t find the reference for “checkListeners()”


void loop(){
checkListeners();
lcd.setCursor(0, 0);
if(op==CALIBRATE){
lcd.print("- CALIBRATION -");
lcd.setCursor(0, 1);
lcd.print(“Show BLACK color”);
for(int i=0;i<3;i++){
calib*[0] = -1;*
_ calib*[1] = -1;_
_
…*_
Please, Help to find information about function
Thank you

void checkListeners ()
{
}

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The function definition is probably in the part of your sketch that you didn’t post.

Fank you very much for your reply.