ssl_effective_tls_version
uint16_t ssl_effective_tls_version(SSL *s);
if (ssl_effective_tls_version(s) <= TLS1_1_VERSION) {
if (ssl_effective_tls_version(s) >= TLS1_3_VERSION) {
tls_version = ssl_effective_tls_version(s);
tls_version = ssl_effective_tls_version(s);
if (ssl_effective_tls_version(s) < TLS1_3_VERSION)