I am sorry, but I do not have the time right now to do that. Maybe someone else in the Forum can help.
Here is a link on how to control the BM Smarthub from WD.
I assume the ATEM SKD will be similar to the Smarthub one.
viewtopic.php?f=4&t=3240Basically you will have to connect to the Switcher using a TCP Connection. You will have to find out the Port.
After that you can send Commands as RAW Commands to the Switcher. The Smarthub is a good example for that.
Daniel