October 2019
Intermediate to advanced
350 pages
9h 5m
English
Content preview from Hands-On Internet of Things with MQTT
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Wildcards
When publishing an MQTT message, you always need to specify the exact topic where it should go, as in the following example:
/kitchen/smart-coffee-machine/temperature
Let's say that the smart coffee machine with MQTT has various channels that can be used to control it and receive its status (for example, the current temperature):
/kitchen/smart-coffee-machine/temperature/kitchen/smart-coffee-machine/status/kitchen/smart-coffee-machine/make-coffee
If we had another smart device to monitor our ceiling light and smart coffee machine, we could then subscribe to multiple channels:
/kitchen/smart-coffee-machine/temperature/kitchen/smart-coffee-machine/status/kitchen/ceiling-light/status
If, one year after you finish reading this book, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.