contrived protocol by cperivol

This sketch is missing a short description

This is a sketch that implements the "contrived protocol". The contrived protocol only understands one kind of message which is a single byte, namely 0xff. When the device receives the 0xff message it must respond with a message 0xff. Incoming messages don't have any header's or footers. Outgoing messages must end with 0x00 byte. So basically the only transaction that can happen is: Host: 0xff Dev: 0xff 0x00