Francois,
I would highly suggest implementing as using manufacuturer-specific PID's within RDM. See Section 6.2.10.2 in RDM.
Using the standard RDM frame and defining your own messages within that you can implement firmware uploads. The advantage of doing it within RDM packets and start code is that you can then take advantage of all the other infrastructure that exists out there such as RDM splitters.
Scott
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Scott M. Blair
RDM Protocol Forums Admin
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