the method StartGamepad seams to be correct !
the problem is that the StartGamepad method is an IEnumerable, thus you can't directly call it !
to add an IEnumerable to the Scheduler, you have to add it, using Scheduler.AddEventVoid(...)

in your case instead of trying to call it like :

call it like this :


Scheduler.AddEventVoid method also immediately returns, after it has run the method for one time and then attached it to the scheduler !