Hi Jasem,
no sdk, but in python it is as simple as:
import RPi.GPIO as GPIO
GPIO.setmode((GPIO.BCM)
GPIO.setup(20,GPIO.OUT)
and then
GPIO.output(20,False) or ....,True to activate a switch at pin 20
So can't be too difficult
Point of all this is that if I run Ekos remote on my laptop I can use the switches.
Now I have to use realVNC also to use my little program on the Stellarmate....