Untitled

void setup() {
  Serial.begin(9600);  // Serial monitor for debugging
}

void loop() {
  if (Serial.available()) {
    String data = Serial.readString();
    Serial.print("Received from NodeMCU: ");
    Serial.println(data);
  }

  if (Serial.availableForWrite()) {
    String data = "Hello from Arduino";  // Example string to send
    Serial.print("Sending to NodeMCU: ");
    Serial.println(data);
    Serial.println(data);
  }

  delay(1000);
}