If this function is called with the GNUTLS_HB_PEER_ALLOWED_TO_SENDtype , GnuTLS will allow heartbeat messages to be received. Moreover
it also request the peer to accept heartbeat messages.
If the type used is GNUTLS_HB_LOCAL_ALLOWED_TO_SEND, then the peer
will be asked to accept heartbeat messages but not send ones.
The function gnutls_heartbeat_allowed() can be used to test Whether
locally generated heartbeat messages can be accepted by the peer.
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this manual
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gnutls 3.5.9 gnutls_heartbeat_enable(3)