I'm searching for a mid to high-end mirrorless camera that can connect to an existing WiFi network and has a publicly documented control protocol. Note that such information is hard to find, because they usually just say "WiFi connectivity" in the specs and then one has to dig deeper to understand what that means.
What I've found so far includes:
Fujifilm X-T1: Good camera, but can be used only with proprietary software running only on Windows and mobile.
Sony Alpha A7*: Has a good well-documented protocol, but apparently it works only as an access-point, thus I cannot connect multiple such cameras to the same PC simultaneously, or connect it to an internet connected laptop.
I want to admit that these requirements aren't necessarily practical, but it's a matter of voting with the money for the guys who do the right things.