There’s even a MAX232 on the board so it can talk to RS-232 devices. The hardware is compatible with the standard Arduino IDE as a “Generic ESP8266 Module”, so you’ll have no problem using ...

[Sebastian] is using a NodeMCU but suggests that it could be pared down to any ESP8266 board — with similar cuts made to the rest of the electronics — but has this working as a proof of concept.

Well, the “ESP Everywhere” is an ESP8266 connected to an FTDI mounted on a special “Kickstarter Edition” PCB. Its small form factor allows you to keep it on a keychain and so you can bring ...