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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Subscribing to topics with Python
The code calls the client.subscribe method with "test/drone01" as an argument to subscribe to this specific single topic and the qos argument set to 2 to request a QoS level of 2.
Tip
In this case, we will only subscribe to one topic. However, it is very important to know that we are not limited to subscribe to a single topic filter; we may subscribe to many topic filters with a single call to the subscribe method.
After the MQTT server confirms the successful subscription to the specified topic filter, the specified callback in the client.on_subscribe attribute will be executed, that is, the on_subscribe function. This function receives a list of integers in the granted_qos argument that provides the QoS level that ...
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