Just had a look at the yellow thing.  Neat little device.  Kinda reminds me of an Omega by Onion.io  but the onion device is essentially a tiny linux machine running an OpenWRT router.  As such it is right up our alley as an infinitely configurable linux based wifi hotspot platform.  Check it out.

https://onion.io/omega2-pro/

Disclaimer, I get nothing from these guys other than a few free boards to play with back when they first started making them.  They were students at the university where I worked. But I do think they created something rather cool.

Joe