@Paul-Thornton What is the answer to his question though? I too am very confused by the documentation for the Fipy and expansion boards. There is conflicting or outdated information regarding the expansion board v2.0 and v3.0. Often I don't know which is being referred to, and worse, Pycom's channel resellers like Mouser, Digikey, etc. often mix them up.

Any news regarding RTS/CTS flow control? In my opinion it still does not work.