[musingsole]

> So why invent a new protocol, when an open, standardised protocol already exists.

Because despite being a dinosaur, it still only has middling adoption. It exists in a particular niche of a particular niche of computing.

HTTP, in contrast, is English to MQTT's German. One is just infinitely more common and accessible to the majority of the world. So, if you're serious, use it.

[mmzeeman]

There is no efficient pub/sub functionality in HTTP.