about mqtt

NodeMCU - Lua scripting language
https://www.cloudmqtt.com/docs-nodemcu.html

Nodemcu and MQTT: How to start
https://primalcortex.wordpress.com/2015/02/06/nodemcu-and-mqtt-how-to-start/

NODEMCU PUBLISHING MULTIPLE MESSAGES OVER MQTT
http://captain-slow.dk/2015/10/25/nodemcu-publishing-multiple-messages-over-mqtt/

A simple connected object with NodeMCU and MQTT
http://www.foobarflies.io/a-simple-connected-object-with-nodemcu-and-mqtt/

Introduction to the MQTT Protocol on NodeMCU
http://www.allaboutcircuits.com/projects/introduction-to-the-mqtt-protocol-on-nodemcu/