I have build a Allstar node with RPI 3 which works just fine. What I would like to do is have a status LED using a RBG LED, I would like to know which GPIO pins to use. I know i can use pin 2 or 4 for power no but do not know which pins for TX and RX maybe pin 8 (TXD) and pin 10 (RXD). So I need some advice. Tom