serielEvents

With 1.5.2 there is serielEvent problem in the core.
by adding this code:

void serialEventRun(void) {
  if (Serial.available()) serialEvent();
}

works for serial0 but what is the code for serialEvent3?

I've pushed a fix for serialEven that will come out next release 1.5.3.
You can download the nightly build or apply the following patch: