I've got a metered connection (monthly data quota) via a cellular provider.
There are a handful of devices on the local network (a laptop or two, two desktops, a phone, a tablet, etc.). The router is a Novatel T1114; there's a TP-Link switch (TL-SF1008P) that's connected to it.
How can I get a network-wide perspective on what's using my monthly quota? Because the majority of devices connect wirelessly, the switch will only get me a slice of the picture. And I'd like to avoid piecing together data from different applications on different platforms.