A friend had a Rossini, and once I got onto his network, I found the Rossini in my DLNA control point (BubbleUPnP on Android) and played music to it. Source was MinimServer/BubbleUPnP Server on my home NAS. It sounded great.
So my experience is that yes, the Rossini can serve as a DLNA client ("renderer") -- a very good one.