@deftypefun {const char *} {gnutls_psk_server_get_username} (gnutls_session_t @var{session})
@var{session}: is a gnutls session

This should only be called in case of PSK authentication and in
case of a server.

@strong{Returns:} the username of the peer, or @code{NULL}  in case of an error.
@end deftypefun