Audio Using Bubble UPNP Dlna Serrver with Samsung S3 mini and Marantz MCR 610 Receiver

I have downloaded the Bubble UPNP DLNA Server app to my S3 mini. It installs fine and I can see my laptop as one of the libraries in Bubble but I can only see one Renderer - Local Renderer which is my S3 mini. I also have a Marantz MCR610 CD / Network Receiver connected to my home broadband network. The latter can see my laptop files but ikt cannot see my Smartphone files and my Smartphone cannot see the Marants receiver as a Renderer. Iwant to be able to play my music files on my S3 mini on the Marantz. What am I doing wrong. I think tyhe Marantz is DlNA compliant so I thought installing Bubble UPNP would solve my problem. Can anyone help ?