Well i have a Samsung TV, and until yesterday i was running Mezzmo 3.0.2 and i could not see the HDHR Primes at all in Mezzmo. I loaded the latest version of Mezzmo and the HDHR devices are now listed in the the list of devices Mezzmo sees. But i don't know where to go from there.
The real question is, i guess you want to use mezzmo because the Visio TV does not see the HDHR prime on its own. My samsung D6000 does not have that problem, but the DNLA interface is not very good even if it does work. The problems are , it lists all the channels even if you don't get those channels, so i would get a list of 1500 channels and to page to the channel you want could take 10 to 15 minutes. Also it only worked with the non DRM channels i think.
the HDHR view app is adding a favorites list so you could have a DNLA list of just the channels you want.
You may want to take a look at this software HDHRFling for the HDHR and it might work for you
http://hdhrfling.com/