Are you trying to stream audio from the mixer over the network? I don't think it does that. Physical I/O only as I understand.
Several years ago, I was looking to build a portable sound system with wireless control, for a "guerrilla concert" sort of idea. The Soundcraft ui series and the Behringer X-Air series were the only ones that fit the bill at all, so I was looking at both. Ended up going with a Behringer XR18 for the I/O count and price. The only benefit I saw to the Soundcraft was the library of guitar amp models, but it came at such a cost to everything else that I didn't think it was worth that. Fast-forward to today, and I haven't even used the Behringer's token amp model very much, nor have the musicians had a problem with it.
Anyway, when I was looking then, I never saw anything from either one about streaming audio. Control yes, but not audio. There have been several requests from FOH Engineers to stream the Solo and a Talkback, but it doesn't even do that. No streaming audio AT ALL. So I made one from a source-code-only Linux app (downloaded the source and built it myself), and a USB sound card plugged into the mixer's headphone jack and a spare input. That end runs on a Pi that was there anyway for other things, and the other end runs on the Linux laptop that also runs the controls.
Latency with that app is...not great. Maybe the protocol isn't really suited for what I was doing with it, but the buffer settings that it took to eliminate the "skipping CD" effect, also made about 1/2-second of delay. Okay for a conversation to stage or to see who's making "that sound", but not to make a live announcement on! Maybe a different streaming app would work better, or maybe that latency is okay for you too? (delay everything else to match, no feedback to the "performers", adding 1/2-second to what a video streaming platform does is probably negligible anyway)
