Hands-On Edge Analytics with Azure IoT

The function component

The function component is the second component we will add to the dashboard. Function components are used to run JavaScript on the msg object. We will use the function component to add text to the message coming from the mqtt in component.

To add a function component, do the following:

1. You will find the function component under the function section on the left. Click and drag the function component onto the canvas.
2. Connect the output of the mqtt in component to the input of the function component.
3. Double-click on the function component to enter Edit function node.
4. Set the Name field to Add to Message.
5. Set the Outputs field to 2.
6. Copy and paste the following code into the Function box:

msg.payload = msg.payload + ' ...