I'll just pile on my own accolades. We use MQTT to connect handhelds with in the field ag irrigation controllers. There's probably about 10,000 valves on farms

I'll just pile on my own accolades. We use MQTT to connect handhelds with in the field ag irrigation controllers. There's probably about 10,000 valves on farms and other ag projects throughout, that are ultimately scheduled and monitored through MQTT. We've even been able to build a full request/event protocol on top of it. The protocol is simple enough, that when I wasn't happy with not many full solutions existing in iOS, I just rolled our own in a day or two. Currently adding an Elixir REST bridge to the whole thing. It's been pretty cool all around.