Steam Link app for android has been out for sometime now. I just tried it, but could not connect to my host pc with my mibox for some reason. Whenever I try connecting to my pc with it, mibox throws me back to steam link menu while starting big picture mode on the pc. The same setup works with my android phone. (Gamestream via mibox also works.)
Did anyone else try?
Edit: If anyone ends up here via a search engine, Factory resetting my mibox worked, I can finally use steam link now. I must admit I hate setting up apps all over again.
Works well for me over 5 GHz wifi with an Xbox One BT Controller.