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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Understanding the MQTT puzzle -- clients, servers, and connections
The MQTT broker is known as MQTT server in MQTT 3.1.1, and therefore, we will refer to it as the server. However, we must take into account that the documentation for MQTT servers, tools and client libraries can use the old MQTT broker name to refer to the server.
The MQTT server uses the previously explained topic-based filtering to filter and distribute messages to the appropriate subscribers. There are many MQTT server implementations that provide additional message filtering features by providing custom plug-ins. However, we will focus on the features that are part of the MQTT requirements.
As previously explained, in MQTT the publishers and the subscribers are completely decoupled. ...
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