This function can be used by a client to send data early in the
handshake processes when resuming a session. This is used to
implement a zero-roundtrip (0-RTT) mode. It has the same
semantics as gnutls_record_send().
There may be a limit to the amount of data sent as early data.
Use gnutls_record_get_max_early_data_size() to check the limit.
If the limit exceeds, this function returns
The number of bytes sent, or a negative error code. The number
of bytes sent might be less than data_size . The maximum number
of bytes this function can send in a single call depends on the
negotiated maximum record size.
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⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to email@example.com. This page was obtained
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gnutls 3.7.2 gnutls_record_send_early_data(3)