Hi Klaus, a few hours after I posted here, I managed to understand the issue: the structure esp_tls_t was being declared differently between the translation unit of my code and the one of mbedtls, so mbedtls allocated, say 1700 bytes for the structure, while on the outside the code thought it was 21...

Hi Klaus, I'm in your exact situation and I'm going crazy about it. Have you managed to solve the issue? I don't know what else I can try to figure it out.

Thanks
Simone