May be late to the party with these, but I'm planning to do some hacking around with the ESP8266 wifi microcontroller and connect them up to some of my vintage machines. They are surprisingly cheap ($2-$3 for a chip and breakout board) and come with serial-to-wifi firmware installed, but can be flashed with your own firmware. Just wondering if anyone has had the chance to use these for any reason. I have a few arriving tonight and will see how they work.