I assume SDDP is just Control 4's
variant (most likely an extension to) SSDP. If not, then they just
made it hella confusing!
SSDP (note SS not SD) is already in use by a whole range of gear
as part of the UPnP protocol.
iViewer can already discover these sorts of devices, and that is
shown in the Sonos module, iTunes module, etc.
Anything that makes devices easier to discover is a great step
forward, so hopefully manufacturers get their act together and
follow Control4's lead.
In the end, this could be something we add into guiDesigner, to
automatically discover devices on the network and add them to the
list of devices to control or something along those lines.
What uses were you thinking of Paul?