Hello Mbed-TLS team,

I am reaching out for guidance on an issue I've encountered while integrating MbedTLS for HTTPS requests using the coreHTTP stack alongside FreeRTOSplusTCP on an STM32F4 device. Although I have successfully implemented an HTTP client, moving to  HTTPS has presented some challenges.

My approach has included several adjustments to the mbedtls_config file, such as:

- Integrating a Random Number Generator (RNG) from STM32 within the mbed_Entropy_poll function.

- Utilizing the calloc and free functions provided by FreeRTOS.

- Modifying the search algorithm to correctly handle null-terminated PEM certificates.

Despite these efforts, I am unable to establish a connection to the server, with the process consistently failing during the TLS handshake phase. Specifically, the client hello message is transmitted from my device, but no response is received from the server, resulting in an MBEDTLS_INTERNAL_ERROR.

Enclosed with this email are my mbedtls_config file and a detailed account of the issue as posted on the FreeRTOS forum. While I do not expect a full code review, any insights into potential causes for this type of handshake failure would be greatly appreciated.

Thank you for your time and assistance.

Regards,

Ashvajit Prasad