As I understand it, MQTT is based on TCP/IP, not HTTP... So at the moment, Espruino won't do it with the built-in CC3000/WIZnet drivers because there's no API to send/receive raw TCP/IP. That is on my list of stuff to do though, so it shouldn't be too far off.
Having said that it looks like there's MQTT-S for lower-power networks, and Espruino could do that - because then it's just a matter of talking to whatever radio there is.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
As I understand it, MQTT is based on TCP/IP, not HTTP... So at the moment, Espruino won't do it with the built-in CC3000/WIZnet drivers because there's no API to send/receive raw TCP/IP. That is on my list of stuff to do though, so it shouldn't be too far off.
Having said that it looks like there's MQTT-S for lower-power networks, and Espruino could do that - because then it's just a matter of talking to whatever radio there is.