SSL_set1_server_cert_type
if (!SSL_set1_server_cert_type(con, cert_type_rpk, sizeof(cert_type_rpk))) {
__owur int SSL_set1_server_cert_type(SSL *s, const unsigned char *val, size_t len);
if (!TEST_true(SSL_set1_server_cert_type(serverssl, cert_type_rpk, sizeof(cert_type_rpk)))
|| !TEST_true(SSL_set1_server_cert_type(clientssl, cert_type_rpk, sizeof(cert_type_rpk))))