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@code{flags} can be one of @code{GNUTLS_CLIENT} and @code{GNUTLS_SERVER} . For a DTLS
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entity, the flags @code{GNUTLS_DATAGRAM} and @code{GNUTLS_NONBLOCK} are
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also available. The latter flag will enable a non-blocking
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@strong{Returns:} @code{GNUTLS_E_SUCCESS} on success, or an error code.