March 2018
Beginner to intermediate
410 pages
10h 40m
English
Content preview from Mastering Internet of Things
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Understanding the Publish/Subscribe pattern
The Publish/Subscribe pattern solves the problem of detail, by introducing a new concept: a topic, or a node. A broker is used to distribute messages from publishers to subscribers. Each message that is being published, is published on a given topic (or node). In turn, subscribers let the broker know which topics (or nodes) they are interested in. The broker matches incoming publications with the requests of the subscribers, and forwards messages accordingly. Using such message filtering makes sure participants avoid receiving unnecessary messages. In MQTT, publishers can also be subscribers.
Topics (or nodes) can also be formed into trees, with topics, sub-topics, and so on. This allows for a great ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.