I just wanted to let you know, in case you missed the mentions on Twitter, I gave a talk on MQTT Security and ACL In Depth for Mosquitto at the first ever WindyCityThings conference in Chicago. It was great to meet a number of the attendees from a breadth of backgrounds to talk Internet of Things! I look forward to at least attending, if not speaking there next year.
I also happen to have been recorded that day, with the video of my talk here.