External controller app - do I need a plugin?

[capt_s]

I want to create an app with easy-to-use controls specific to my needs. I imagine the whole thing like OBS Studio and my app running at the same time, and OBSS reacting on signals sent by my app (one way). I was reading the docs and could build the data object to send the singal, but is there a platform-independent way to transfer it to running OBSS instance? Or can I rely on X/Wayland/Windows APIs to send OBS signals somehow? Or there is no such solution at all and I need to also create a plugin to take the signal by my own mechanizm?