The August 2016 DFW Hackster MQTT meeting was a blast. Here is a link to the online presentation. https://sway.com/DpyBV3JjNYoTFrsx
If you check back on this post I will update it with related videos. I promised some people at the event to do an Arduino MQTT demo and also finish up my video on the MQTT garage door opener.
If you want to get started with MQTT in your own time here are some resources:
What is MQTT
TI LaunchPad MQTT demo.
Software to Download:
Download HiveMQ it is free but they will make you fill out contact information for the download link. There is lots of great info and white papers on MQTT here so stay awhile and do some reading!
You will need a MQTT test client, I suggest MQTT.FX
Here are source code samples for NodeMCU, WeMos, and TILaunchpad.