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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Processing the received messages in JavaScript
The onMessageArrived function receives a Paho.MQTT.Message instance in the message argument. The code prints a message to the console log indicating that a message has arrived with the destination topic and the payload string included in the message.destinationName and message.payloadString attributes.
Then, the code checks whether message.destionationName starts with APP.HomeAutomation.Manager.ledResultBaseTopic to make sure that the message's destination topic is the one defined for the results of the commands related to LEDs.
Note
In this case, the code only subscribes to the topic filters that we defined for publishing messages with the results of the commands related to LEDs. However, we include ...
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