gnutls_psk_client_get_hint - return the PSK identity hint of the peer
const char * gnutls_psk_client_get_hint(gnutls_session_t session);
is a gnutls session
The PSK identity hint may give the client help in deciding which
username to use. This should only be called in case of PSK
authentication and in case of a client.
the identity hint of the peer, or NULL in case of an error.
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