Yup, a web server farm made from three of everyone’s favorite WiFi dongle, the humble ESP8266. Eldon’s server farm is currently serving web pages here , running on three ESP8266 boards.

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Since the Wemos D1 can't directly measure internet speed like a PC, it can simulate a speed test by: Downloading a file or data from a server. Measuring the time taken. Calculating speed = size / time ...

The web server firmware opens up a ton of possibilities with CGI scripting. When booting up in AP mode, you can even connect the ESP8266 to another access point right from the your browser.