void setup() {
  Serial.begin(115200);
  Serial.println("System Ready. Type something and press Enter:");
}

void loop() {
  if (Serial.available() > 0) {
    Serial.println("System Ready. Type something and press Enter:");
    String incoming = Serial.readStringUntil('\n'); // Read until Enter is pressed
    Serial.print("I received: "); 
    Serial.println(incoming); // This prints it back to the screen
  }
}