I have yet to receive my OsPi plus which I intend to use with a RPi 2. That is supposed to do more than control my sprinklers, for example measure and transmit temperature readings. For that I’d need the GPIO4 pin along with 3.3V and ground. The layout shows two rows of soldering pins which seem to be the replication of the RPi pins. Is it possible to use them? Which GPIO pins are used by OSPi itself?