is a gnutls_session_t type.
void * data the buffer that the data will be read into
the number of requested bytes
unsigned char * seq
is the packet's 64-bit sequence number. Should have
space for 8 bytes.
This function is the same as gnutls_record_recv(), except that it
returns in addition to data, the sequence number of the data.
This is useful in DTLS where record packets might be received
out-of-order. The returned 8-byte sequence number is an integer
in big-endian format and should be treated as a unique message
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gnutls 3.7.2 gnutls_record_recv_seq(3)