Zabbix

...G...PS. [ZBXNEXT-1263] fixed zbx_tcp_send_ext()

    - theoretically OS can take data for sending in very small amounts (even by 1 byte).
      zbx_tcp_send_ext() was changed to work correctly in this case.
    - for unencrypted sending zbx_tcp_send_ext() passes the rest of data (beyond the first 16 kB) to OS in one chunk,
    - for encrypted sending zbx_tcp_send_ext() passes data the rest of data to OS in chunks up to 16 kB (max TLS record length),
    - variable 'i' renamed to more meaningful 'bytes_sent'.