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IOT Protocols: MQTT vs CoAP vs HTTP

With the explosion of IOT (Internet of things), there are now more technologies we can use to build systems.  In reality, we’ve been doing IOT for years.  We’ve been networking devices for a long time.  We’ve been collecting data from remote nodes.  This is nothing new, but what the IOT movement brings to the table is technologies that are much lower cost, and more standardized.  Two of these technologies are MQTT and CoAP.  Both very interesting, and very useful.  Recently, I helped a system manufacturer think through the architecture of a system with the following requirements: