char buffer[30];
int len2;
void setup() {
  Serial.begin(115200);
  Serial.setTimeout(20000L) ; // wait until 20 seconds for input from serial
  Serial.println(F("Type C o P, ending with #"));
}

void loop() {

  
  if (Serial.available()) {
    // Colocar el terminador de cadenas de caracteres
    buffer[Serial.readBytesUntil('\n', buffer, sizeof(buffer) - 1)] = 0; 
    Serial.read(); // Descarta el '\n'
    Serial.print(F("Linea de texto leida: \""));
    Serial.print(buffer);
    Serial.println('\"');
    Serial.println(F("Type C o P, ending with #"));
  }
}