Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 139)

Publication ENET-UM527E-EN-P - October 2006
Socket Interface 139
This fragment Structured Text logic shows an example of handling a
partial Write service.
if ( WriteMSG0.ER ) then
/* write failed. if error was EWOULDBLOCK then it means less than the requested byte were sent.
*/
if ( WriteMSG0.EXERR = 70 ) then
/* need to issue another write, with the data that was not sent */
SentLen := WriteResponse; /* here's what was sent */
/* adjust the size */
WriteParams.BufLen := WriteParams.BufLen - SentLen;
/* copy remaining data to send to MSG buffer */
COP ( WriteBuf[SentLen], WriteParams.Buf[0], WriteParams.BufLen );
/* BufLen = Timeout + Sockaddr + data length */
WriteMSG0.REQ_LEN := 4 + 12 + WriteParams.BufLen;
MSG ( WriteMSG0 );
end_if;
end_if;