CHAPTER 4 ■ COMPLEX FLOWS: NODE-REDSet the URL property to /lightSensorTweet. This URL will be prepended by the
Node-RED server and port. The Node-RED server used in this project is available at
10.0.0.6:1880 , so Arduino will send data to 10.0.0.6:1880/lightSensorTweet.
Finally, each node can be given a custom name that describes the task it performs.
Call this node Receive HTTP Request.
Click OK to make the updates.
Data coming from the device using HTTP is in string format, so you need to convert
it into a number. Drag and drop a function node and place it in the Flow tab after the
Receive HTTP Request node. A function node lets you write code to manipulate payload.
Your flow should look similar to Figure 4-13 at this point.
Figure 4-13. Function node
Double-click the function node to open the properties dialog, as shown in
Figure 4-14. Change the name to Convert to Number. Update the code inside function
as provided in Listing 4-1. Click OK to save your changes. Connect your Receive HTTP
Request and Convert to Number nodes.