DTLS_server_method
LSSL_USED(DTLS_server_method);
const SSL_METHOD *DTLS_server_method(void); /* DTLS v1.0 or later */
LSSL_ALIAS(DTLS_server_method);
.method = DTLS_server_method,
cfg.meth = DTLS_server_method();
cfg.meth = DTLS_server_method();