Re: [lwip-users] Is tcp_err()-callback optional?

[Simon Goldschmidt]

Karl Karpfen wrote:
>indepenedent from the fact if it makes sense or if it is bad program style:
> is it mandatory to announce a error-callback via tcp_err() or will the whole
> thing also work smoothly when there is no error-callback function available?

It is kind ofmandatory: without an 'err' callback, your application would never 
know if the pcb got deallocated (and possibly reused) due to a RST received or 
due to local pcb shortage.


Simon