On page 12 of the MIDI CI Spec v1.1 it says:
Broadcast MUID = 0x0FFFFFFF
However in the discovery message, invalidate muid, profile enabled report and profile disabled report messages it shows:
7F 7F 7F 7F - Destination MUID (LSB first) (to Broadcast MUID)
I would think that this might just be an oversight, but it is hard to tell if the broadcast bytes are limited to 7 bits or not?
I think we will need some clarification in order to ensure this is standardized.
One other thing that might make the process of developing for MIDI2.0 would be to have some pre-defined test conditions with bytestreams, and the pre-defined interpretations. I am synthesizing these bytestreams by hand currently, and will be posting a large number of example byetstreams soon. It would be good to check against whatever reference encoded messages that the MIDI Association is using.