void setup()
{
	pinMode(13, OUTPUT);
	Serial.begin(115200);
}

void loop()
{
	while (Serial.available())
	{
		String s1 = Serial.readStringUntil(':');
		String s2 = Serial.readStringUntil(';');
		process_event(s1, s2);
	}
	delay(10);
}

void process_event(String s1, String s2)
{
	if (s1 == "LED" && s2 == "on")
		digitalWrite(13, HIGH);
	if (s1 == "LED" && s2 == "off")
		digitalWrite(13, LOW);
}