This functionality will change soon now that the desktop app has evolved!

You can now use OBS hotkeys to trigger the deck buttons. In OBS => Settings => Hotkeys, there are entries for the 100 deck buttons. Once defined, triggering a hotkey will simulate pressing the button on the deck. The only feature not supported at the moment is the toggle button feature : only the button's first state can be triggered, but I'll have a look at adding this extra function for a future update.