Re: [lwip-users] tcp_write fails: package generation doesn't work properly

[Sergio R. Caprile]

Well, I don't see how you call those functions on your client, but you
know you have to wait to be connected before you send data, do you ? The
callback in tcp_connect() will be called when that happens.
Also, you are supposed to check for the available room  before calling
tcp_write(), and/or check its returned value to confirm data has been sent.
Have you run any other (supposed to work) example on your client before
trying this your own code ?
Assuming the port is working and you are calling lwip functions from
only one thread, have a look at the examples in the contrib area, smtp.c
is a master piece of an example for a client. Also, the wiki is not bad
at all.