Thingsboard tutorial (21): save data after processing using message types and data processing nodes

Preface

In the last chapter, we learned how to filter telemetry data , And save to database , Which USES script Nodes and save timeseries node . In this article, we will implement a real business scenario .
The scene is like this ,
Our smart thermometer Uploads The data is Chinese temperature , And when we use it , Or you need to use Degrees Celsius to show .
This is the time , We need to process the uploaded data once , Convert Fahrenheit to Celsius . And save it in the database
Among these conditions, we add another condition , Only the telemetry data is converted into temperature .
Let's take a look at how to implement .

Message type node

After carefully understanding the problem , We know that we need a node to send telemetry data from From all the data , Treat them separately .
At this time, we need to use message type switch node . Using this node, telemetry data can be separated for processing , Go through different processes .
Take a look at the node configuration .

take message type switch Drag and drop nodes into the editing area , And configure

Message data processing node

Due to the need for temperature conversion , So we need one script, Notice the script Is in transformation script

Drag the node into the editing area ,