Re: [lwip-users] netconn - using in different tasks

[Simon Goldschmidt]

> Finally I wrote the server with RAW API and tcpip_callback function. It's
> working ok, but there is a one strange thing. Sending reply to the client
> takes about 250 - 1000 ms (taken from Wireshark). Sending reply directly
> (without tcpip_callback) takes less time (max 2 - 5 ms). Have you got similar
> results?

Are you saying you are calling something like tcp_write()/tcp_output() from one 
of the serial threads? That would break lwIP threading and very likely produces 
bugs (even if not always - depends on timing).

Why tcpip_callback needs longer is strange, though. You could try to turn on 
debug logging and/or check the return values of tcp_write()/tcp_output(): such 
long time spans suggest data is not sent right away but only later (from a TCP 
timer).

Simon
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