Nice one Guido!
Downloaded, and I'll sure have a good look at it - it seems all plain MIDI (SysEx) at first sight. I bet we can do a OSC <--> HUI patch. But I also bet this is still going to be a lot more complicated than wrapping your head around OSC.
Too bad I don't have such a device to play with. Explain again please, is there anything possibly interesting about this protocol for those who don't own a specific (expensive) device?
PS: looks like you posted two identical copies of the file HUIREFRX.txt, and forgot
HUICSET2.txt.