April 2017
Intermediate to advanced
280 pages
6h 18m
English
Content preview from MQTT Essentials - A Lightweight IoT ProtocolBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Learning about the different Quality of Service levels
Now that we understand how the connection, subscription and publication works in combination with topic names and the topic filters with wildcards, we can dive deep on the QoS levels. So far, we have analyzed how both the subscription and publication worked with a QoS level equal to 0. Now, we will understand what this number means and how things work when we use the other available QoS levels for the publication and the subscription.
Note
Remember that publication involves publishing from the MQTT client to the MQTT server and then from the server to the subscribed client.It is very important to understand that we can publish with a QoS level and subscribe with another QoS level. Hence, there ...
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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.