12-5-2019 Got the same message here. I live alone in an apartment. I immediately paused it just like you. I Googled it and found a couple of entries: 1) a temperature sensor (looks like commercial use), and 2) a 3-in-1 gadget that can act as a portable charger, a personal hotspot, or a file-sharing hub. The latter is most likely. Pictures show a router with a Ralink RT5350F system on a chip.
I'm sure someone was just setting it up and it found my network and tried to connect. I no longer see it trying to connect. Thanks to the XFi app I head these off although I doubt they could get into my network anyway.