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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Unsubscribing from topics
Whenever we don't want a subscriber to receive more messages whose destination topic name matches one or more topic filters, the subscriber can send a request to unsubscribe to a list of topic filters to the MQTT server. Obviously, unsubscribing from topic filters is the opposite operation of subscribing to topic filters. We will use the MQTT.fx GUI utility to unsubscribe the MQTT client from the sensors/drone01/altitude topic. Follow the next steps:
- Go to the MQTT.fx window in which you established a connection and subscribed to a topic.
- Click Subscribe.
- Click on the panel that displays the
sensors/drone01/altitudetopic name at the left-hand side of the window. Then, click on the Unsubscribe button located in this panel. ...
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