1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17

void setup() {
  Serial.begin(9600); // Start serial communication at 9600 baud
  while (!Serial);    // Wait for serial port to be ready 
}

void loop() {
  int bytesAvailable = Serial.availableForWrite(); // Check how many bytes we can write

  Serial.print("Bytes available to write: ");
  Serial.println(bytesAvailable);

  if (bytesAvailable > 13) {
    Serial.println("Hello, world!"); // Send a message only if enough buffer space is available
  }

  delay(1000); // Wait a second before checking again
}