If you are using Arduino core for ESP32, than use digitalRead(pin); which will return value 0 or 1. You need to pass one parameter which is GPIO pin number. For example, #include <Arduino.h> #define MyPin 15 #define LED_BUILTIN 2 //----------------------------------------------------- void setup(voi...

I am also doing development similar to @fermienrico. I have developed code for ESP32 in Arduino IDE. ESP32 working in access point mode. I have developed Java code on windows machine which scan nearby WiFi device and connect to it. I am able to connect to ESP32 from windows machine and both side (ES...