October 2019
Intermediate to advanced
350 pages
9h 5m
English
Content preview from Hands-On Internet of Things with MQTT
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Forbidden characters
There are a few exceptions to characters that cannot be used in topic names: topic names beginning with a dollar sign ($) are treated differently, and are often used on MQTT servers to transmit internal server messages (using the $SYS topic). You should not use the $ sign as the first character of a topic name in your projects.
Also, you should not use the null character in topic names (0x00). If you don't know what it is, don't worry. It is a control character that is used in languages such as C, where it terminates a string. It is not a physical key on your keyboard.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.