Yeah, that's what I'm talking about two posts up: Shouldn't be a problem, but a large number of unknowns enter into the equation - such as the client AP isolation, where two WiFi client devices don't see each other: the AP just drops packets coming from one destined to the other. The user's network might have this on, and the user may not even be aware of it. Even if thus is OK, finding a server in the local network is not straightforward, even with Zeroconf/Avahi. And those are just a few out of many issues.