Serial.println() was not printing on serial monitor

Projects General Guidance
44

OK. You lost the first one in the loop(). It should have started at 0. So we are back to post #2 also mentioned now in post #41 (and maybe elsewhere)
Anyway, it looks like it needs 5 seconds to start if left on its own.
Try this:

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);

  while (!Serial)
  {
    ; // Wait for serial to connect
  }

  delay(1000);
  Serial.println("setup()");
}

void loop()
{
  static uint32_t i = 0 ;
  Serial.print("loop()");  // should start at 0
  Serial.println( i++ ) ;
  delay( 1000) ;
}