my problem is that; no headers files (.h) found in C:\Users\user\Documents\Arduino\hardware\espressif\esp32\libraries\AzureIoT. i try to use esp32 for wifi

connection but it gives me that error. Also,my AzureIoT foulder is empty.I use windows 10.

what should i do?

This is because AzureIoT is a submodule. I guess you skipped a step of the installation instructions:

Really, you should only be installing the ESP32 core this way if you are a beta tester or doing development work on the core. Normal users should always use the Boards Manager installation instructions:

I recommend that you delete the C:\Users\user\Documents\Arduino\hardware\espressif\esp32 folder and install the ESP32 core using Boards Manager.

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yes, now it is working very well.Thank you so much.

You're welcome. I'm glad to hear it's working now. Enjoy!