void setup() {
  Serial.begin(115200);
  Serial.println("Setup-Start");
}
void loop() {
  Serial.println("Top of loop");
  test();
  Serial.println("Bottom of loop");
}


void test() {
  Serial.println("entering function test");

  while(true) {
    Serial.println("serial print from INSIDE While-loop");
  }
  
  Serial.println("OUTSIDE serial print from OUTSIDE While-loop");
}