With a little bit of googling, I was able to figure out GPIO assignment for the Orange Pi Zero Plus. It is identical to the Orange Pi Zero.
I don't think I have rights to push to git so here is the code.
// Orange Pi Zero Plus
static int iOPIZPPins[] = {-1,-1,-1,12,-1,11,-1,6,198,-1,
199,1,7,0,-1,3,19,-1,18,15,
-1,16,2,14,13,-1,10,-1,5,4}; // last 3 pins are TTY header