In addition to Xbox 360 and Xbox One controllers, it was discovered that Steam Link also supports PS3 and PS4 controllers. I decided to give my Wii U Pro controller a shot. :
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How to Install Steam Link
Wired network is strongly recommended * Compatible controllers with Steam Link: Steam Controller, Xbox One USB wired,… | Xbox controller, Apple tv, Streaming device
Qisahn.com - For all your gaming needs - Steam Link
Steam Controller (Steamworks Documentation)
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TvOS 13 + Xbox controller and steam link = 1080p high end games on Apple tv : r/appletv
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