MBEDTLS_SSL_ALL_ALERT_MESSAGES macro

\def MBEDTLS_SHA256_SMALLER Enable an implementation of SHA-256 that has lower ROM footprint but also lower performance. The default implementation is meant to be a reasonable compromise between performance and size. This version optimizes more aggressively for size at the expense of performance. Eg on Cortex-M4 it reduces the size of mbedtls_sha256_process() from ~2KB to ~0.5KB for a performance hit of about 30%. Uncomment to enable the smaller implementation of SHA256. \def MBEDTLS_SHA512_SMALLER Enable an implementation of SHA-512 that has lower ROM footprint but also lower performance. Uncomment to enable the smaller implementation of SHA512. \def MBEDTLS_SSL_ALL_ALERT_MESSAGES Enable sending of alert messages in case of encountered errors as per RFC. If you choose not to send the alert messages, Mbed TLS can still communicate with other servers, only debugging of failures is harder. The advantage of not sending alert messages, is that no information is given about reasons for failures thus preventing adversaries of gaining intel. Enable sending of all alert messages