| Features | |
| * Add server certificate selection callback near end of Client Hello. | |
| Register callback with mbedtls_ssl_conf_cert_cb(). | |
| * Provide mechanism to reset handshake cert list by calling | |
| mbedtls_ssl_set_hs_own_cert() with NULL value for own_cert param. | |
| * Add accessor mbedtls_ssl_get_hs_sni() to retrieve SNI from within | |
| cert callback (mbedtls_ssl_conf_cert_cb()) during handshake. |