|Subject:||Re: [lwip-users] TCP keeps re-transmitting but no ACK packet after SYN, SYN+ACK|
|Date:||Mon, 09 Mar 2015 20:28:44 +0100|
|User-agent:||Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0|
One more thing is that with exactly same IP configurations, webserver code and same PC & device, webserver is working for one of my previous backup codes (stable released LWIP 1.4.1 and not git head updated). So, I guess there may be some change in the functionality of tcp.c/tcp_in.c/tcp_out.c in current git head because of which my application is not working.
Looking at the traces, all TCP packets sent by your device seem to have invalid *IP* checksums (where ICMP/IPv4 packets are OK). Since the TCP packets might well be pbuf chains while the ping-reply packets are (almost) surely single-pbuf-packets, I suspect a free-after-use issue somewhere in your port/driver setup.
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