> here, you are not transfering any "control plane" (volume, 

.... no such thing in RAOP. Sender controld volume

> metadata,

Only exists in RAOP version 2; most devices do not accept it anyway
(Such as Apple AirPorts) plis it's not very usefull in this concept of
blind streaming

> precise track position 

AirTunes/AirPlay does not care about track position. It does not know
what track ist it anyway. And this is my point - this is very different
from UPnP and MUCH simpler.

http://nto.github.io/AirPlay.html

> and other feedback to LMS

Again, no such thing. Only feedback you get is if the device has a
digital out or not, if it has a password or not, and if output jack is
connected to anything.

> only "data plane" (audio stream)

Yup, thats the general idea : you send binary data from pont A over the
network to point B :)

> No timing sync between the 2

I am not 100% sure, but I beleive receiving devices are supposed to sync
between themselves, sender only isses command to sync. I will check....

So there is a timing protocol in AirTunes 2, but this is not mandatory
in any way:
http://git.zx2c4.com/Airtunes2/about/

> no track control

Would be pointelss, and does not exist in RAOP specs. It's like an audio
cable, just going over TCP/IP network.

> PasTim has done a great job doing the same with uPnP devices. 

What / who is PasTim?

Thanks, 
Andrej


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