October 2019
Intermediate to advanced
350 pages
9h 5m
English
Content preview from Hands-On Internet of Things with MQTT
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Summary
In this chapter, you learned how to display text on an e-paper display and how to send text to it either via serial port or MQTT.
You learned how to make use of MQTT features such as QoS 1 and retained messages. QoS 1 makes sure messages are delivered at least once. The last message sent with the retained message flag is stored for each channel. When clients subscribe to it, they will instantly receive the last available retained message, even when no message has been published since the Arduino resubscribed.
You also learned how to send messages using different QoS settings as well as the retained message flag via the free command-line tool Mosquitto.
In the next chapter, you will build another MQTT-connected device: a smart productivity ...
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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.