Re: [lwip-users] TCP not sending initial ACK

[address@hidden]

Chuck Kuecker wrote:
> I’ve tried changing the frequency of LWIP interrupt handler calls, 
> both greatly slowing and speeding them up, with no apparent change in 
> behavior.
What exactly do you mean with "interrupt handler calls"? The timers? 
They should *not* be called from an interrupt level: the core code of 
lwIP may only be accessed from one context at a time!

If you obeyed this rule and still have problems, have a look at 
wireshark packet traces and see if it reports errors in a packet. Also, 
have a look at the stats (turn them on in lwipopts.h if not already 
done) and find out whether there are packets dropped.

Simon