__owur int dtls1_write_bytes(SSL *s, int type, const void *buf, int len);
__owur int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
unsigned int len, int create_empty_fragement);
__owur int dtls1_write_bytes(SSL *s, int type, const void *buf, int len);
__owur int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
unsigned int len, int create_empty_fragement);