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Some wireless access points / routers restrict access to Lan devices by default. You should be able to change this.
It’s also possible you have your wireless access point set up incorrectly if it isn’t your main router. Is your wifi devices on a different subnet? Is the WAP running a dhcp server? Did you plug your Lan cable into the wan port on it instead of one of switching ports?
If you can ping the server from a wifi device then it’s a server configuration issue. Is your NC instance binding to local host or the static ip? 0.0.0.0 would work too.
5 hubs deep and 127 devices per usb controller (not port)
To confuse this more many usb3 or newer controllers won’t handle more than 32 devices.
Now add to that most 7 port usb hubs are actually 2x 4 port hubs.
You may be starting to see why it is so hard to definitively say if a certain usb setup will work or not without testing the actual hardware.
Side note, a lot of usb devices even count as 2 devices due to hw encryption chips, like wd external hard drives.