@deftypefun {unsigned int} {gnutls_dtls_get_data_mtu} (gnutls_session_t @var{session})
@var{session}: is a @code{gnutls_session_t}  type.

This function will return the actual maximum transfer unit for
application data. I.e. DTLS headers are subtracted from the
actual MTU which is set using @code{gnutls_dtls_set_mtu()} .

@strong{Returns:} the maximum allowed transfer unit.

@strong{Since:} 3.0
@end deftypefun