nodemecu/Debug/0x02_debug/0x02_debug.ino

// Dispositivo
const int devID = 2;
int inQuery;


void setup() {
  Serial.begin(9600);

}
void loop() {

  if ( Serial.available() > 0) {
    inQuery = Serial.read();
    if ( inQuery == devID) {
      Serial.write("2");

    }

  }

}