This is a placeholder for protocol headers within the raw radio feature of the micro:bit.
From Joe Finney:
“I knew that once a raw radio interface like this started getting used then folks would want to experiment with their own protocols, which is a good thing IMHO, so added three byte to (ironically) help manage interoperability. The three bytes are a protocol id (1 for basic raw datagram), version number (as defined by the protocol itself) and a group number. This is the 01 00 01 you’re seeing there – it’s a raw datagram version 1 frame in group 0.”
* The need for a protocol header
* protocol header format
* registry of protocol types and their payload formats
* how to register a new protocol type
* how to contribute to this discussion document