On Fri, 5 May 2017, Greg Stewart via curl-library wrote:
When I move it to the ESP32, it hangs at "curl_easy_perform". I disabled https on the server and removed the CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST tokens from the code, and it worked great on the ESP32.
That tells us close to nothing. You stopped using HTTPS so of course HTTPS caused you no further problems.
But believe it or not, HTTPS is not meant to hang and it is not something that it usually does for people or users of libcurl. That sounds like a problem/bug/issue/mystery to solve. And since it isn't working as intended, you need to start by enabling verbose and then dig deeper into the functionality to figure out where it hangs and why and then what possibly can be done about it.
What TLS library does this use? Do you have the correct time/date on the thing? The ESP32 is a fairly low end performing device, isn't it? Are you sure you gave it enough time to handle the encryption stuff?
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