BDP-S570 as Renderer (DMR), controlled by DMC

Hi,
Apologies if this may sound not fully relevant to Serviio, but it's a fact the best DLNA experts for Sony products are around here...
I'm running Serviio with my Sony products in a quite satisfactory manner: I particularly appreciate all the work involved in adapting BDP-S570 profile so that files can be played properly.
So, it's all good when I use the attached TV screen to browse my Serviio server content, and most of the time, it plays nicely.
Now, when I want to listen to music content, it's a total waste to power-up a TV screen, as my BDP is connected to an amplifier and speakers.
So I'd like to select DLNA content by another mean, typically with an iPhone being DMC: it would select content and play it on the BDP.
There comes the problem: I could not find any DMC software which would recognize BDP-S570 as a proper Renderer...
I seems the BDP does not declares itself as a full service renderer on the network (my assumption, as I'm not a DLNA expert with all necessary tools to debug).
It a shame as very similar products (BDV-S370, & others) seem to be proper renderers...a very bad Sony marketing shortsight I guess.
Anyway, I was wondering if Serviio could be of any help there, by advertizing proper functionality (as it does for the player function), and allow DMCs to controll this device to, at least, play music...
Maybe it's just not possible, or the magic "profile" should be built into DMC program, to make it as smart as Serviio is?
I would appreciate any idea to enable this use-case (play music from Serviio onto BDP without any screen).
Thanks for consideration!
Apologies if this may sound not fully relevant to Serviio, but it's a fact the best DLNA experts for Sony products are around here...
I'm running Serviio with my Sony products in a quite satisfactory manner: I particularly appreciate all the work involved in adapting BDP-S570 profile so that files can be played properly.
So, it's all good when I use the attached TV screen to browse my Serviio server content, and most of the time, it plays nicely.
Now, when I want to listen to music content, it's a total waste to power-up a TV screen, as my BDP is connected to an amplifier and speakers.
So I'd like to select DLNA content by another mean, typically with an iPhone being DMC: it would select content and play it on the BDP.
There comes the problem: I could not find any DMC software which would recognize BDP-S570 as a proper Renderer...
I seems the BDP does not declares itself as a full service renderer on the network (my assumption, as I'm not a DLNA expert with all necessary tools to debug).
It a shame as very similar products (BDV-S370, & others) seem to be proper renderers...a very bad Sony marketing shortsight I guess.
Anyway, I was wondering if Serviio could be of any help there, by advertizing proper functionality (as it does for the player function), and allow DMCs to controll this device to, at least, play music...
Maybe it's just not possible, or the magic "profile" should be built into DMC program, to make it as smart as Serviio is?
I would appreciate any idea to enable this use-case (play music from Serviio onto BDP without any screen).
Thanks for consideration!