I am currently using an old PC laptop to control everything through APT Astrophotography Tool & PHD2. It works for the camera, mount & guide camera with no additional scripts.
I am trying to lighten the load by moving to a Raspberry pi running kstars/EKOS etc but this is the stumbling block...
So far I know I can control the shutter using a script so it works with this setup, it's just a case of getting EKOS/INDI to send the right 1's & 0's to the relay board to get it to work...