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.
This function must be called prior to TLS handshake.
If the type used is GNUTLS_HB_LOCAL_ALLOWED_TO_SEND, then the
peer will be asked to accept heartbeat messages but not send
The function gnutls_heartbeat_allowed() can be used to test
Whether locally generated heartbeat messages can be accepted by
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gnutls 3.7.2 gnutls_heartbeat_enable(3)