El Bruno

Hi !

In today’s post I’ll share an scenario about:

Invoke an Azure Function to get JSON data

In my Digital Twin scenario, I got an Azure Function that returns the current state of a Digital Twin door. The response from the function is similar to this one:

{
    "state": 0,
    "desc": "closed",
    "source": "blog"
}

So, once the Wio Terminal has internet access, I can invoke the Azure Function and read the value with the door state. In example, for a door open state:

And for the door open:

Important: The sample code is based on the work from Rui Santos, in the article [ESP32 HTTP GET and HTTP POST with Arduino IDE (JSON, URL Encoded, Text)].

I updated the code to work with the specific WiFi and HTTPClient libraries for the Wio Terminal.

Source Code

As usual, the full code is below and some notes

• As mentioned before, this sample uses the Wio Terminal specific libraries for Wifi and HTTPClient libraries .
• The request to the Azure Function for the IoT Door state will be performed every 10 seconds.
• I added a couple of functions at the end of the ino file to display the information on the TFT screen.
• In line 98 the HTTP GET process start. After reading the code for the HTTP Library, I realized that I need to define a timeout (3 seconds) and also invoke the end() function before init the http variable.

Now we are connected, so we can start to interact with Azure resources !

References

• Download Arduino IDE
• Wiki Seeed – Historgram
• Wiki Seeed – loading Images
• Wiki Seeed – Installing the File System Library
• Wiki Seed – Wifi Connectivity

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