I would like to try to help you, but honestly I don't understand what are you doing what is not working
I guess that by "answer the ACK" you mean your application is supposed to send something in response to something and you think it should do it when the ACK comes. Well, that would be true if your application is well written. When lwIP receives the TCP ACK, among other things, it will call the function YOU provided to be called by setting up a callback via tcp_sent(). Did you ? Check the code in the contrib area, smtp.c and httpserver_raw/httpd.c are good examples on how to use the TCP functions. -- _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
