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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Working with last will and testament in Java
Now, we will take advantage of the last will and testament feature. We will create the main class named Main that uses the asynchronous API of the Paho Java Client, the previously coded SecurityHelper class to establish an encrypted connection with an MQTT server, and the SensorsManager class to process the received messages with commands. The code will configure a message to be sent as the last will when the connection is lost. In addition, the Main class will call the loop method for a SensorsManager instance to publish messages with data retrieved from the sensors when they are turned on with the appropriate commands.
We will split the code for the Main class into many code snippets to make it easier ...
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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.