Publish JSON Data over MQTT with Node-Red
One of the the most common use scenarios for using JSON data is for combining data from multiple sources.
In this tutorial we will simulate a multi-sensor environment were we collect data from several sensors and publish it wusing MQTT on a single topic using JSON encoded Data.
The video also demonstrates how we can hold and delay publishing data while we combine it.
To accomplish this we use a fuction node and use the context object to store sensor values before we publish them.
Related Tutorials and Resources
Flow used in video
https://stevesnoderedguide.com/downlo...
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https://stevesnoderedguide.com/workin...
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Introduction to JSON
https://www.w3schools.com/js/js_json_...
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Working With JSON Data in Node Red
• Working With JSON Data in Node Red
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Creating a Simple Controllable MQTT Sensor With Node-Red
• Creating a Simple Controllable MQTT S...
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The Node-Red Message Object for Beginners
• The Node-Red Message Object for Begin...
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Create a Node Red Basic Flow - MQTT Subscribe Example
• Quick Introduction to Node Red ( Crea...
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How to Create a Node-Red MQTT Dashboard
• How to Create a Node-Red MQTT Dashboard
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How to Store Data In Node Red Variables
• How to Store Data In Node Red Variables
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Receive JSON Data Over MQTT with Node-Red
• Receive JSON Data Over MQTT with Node...
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