Re: [lwip-users] HTTP client with raw tcp

[Andy Pont]

The saga continues...

> I can't see anything obvious in the lwIP code that would corrupt this.

This was down to me, netif -> state was pointing to something that was
created on the stack and which no longer existed! 

Having resolved that, it appears that it is getting a bit further but the
call to tcp_connect() fails and eventually the error callback is triggered
with ERR_ABRT.  Having poked around under the hood in tcp.c the failure is
triggered as a result of "max SYN retries" being reached.

I have tried simple things like increasing the value of TCP_SYNMAXRTX but it
is obviously a more subtle issue than that.

Regards,

Andy.