int incomingByte = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  if (Serial.available() > 0) {
  
    // read the incoming byte:
    incomingByte = Serial.read();
  
    // say what you got:
    Serial.print((char)incomingByte);
  }
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}