Thingsboard tutorial (20): filtering telemetry data using regular chains

Preface

In the last article, we gave a general overview of the node types in the rule chain , stay tb The rule nodes in the have 6 Type in the

• filter
• Property set
• Transformation
• action
• external
• Rule chain

Originally, I wanted to explain the specific rule nodes under each type in detail , But such It will inevitably be divorced from actual use . So before explaining each specific node in detail , Let's do some practice of rule chain first , Learning in practice , More specific , It's more of a substitute .

So this article will explain the first case , Use rule chain to filter telemetry data , Filter . And that's where Filter the script node .
Let's move on to the topic .

Use rule chain to filter telemetry data , Handle

The business scenario looks like this , We have a smart thermometer , In our lab , It will upload the temperature of the laboratory every once in a while . But this thermometer is always wrong recently , The uploaded data are 100 degree , Also have -80 degree , Such data will cause a "do not disturb" to our data statistics . So we need to write a rule chain to filter out abnormal data , To ensure data quality . Demand is ： If the uploaded temperature Greater than 50 degree , Or less than -10 degree , It is not saved to the database

Understand the requirements clearly , Let's do it .

Create device

Use the tenant administrator to enter the device list ,

Add a new device , It's called a smart thermometer .

Create rule chain

Enter the management of rule chain library