[lwip-users] about tcp disconnections

[Bonny Gijzen]

Hi 2 all,

 

 

I am having problems when the other side suddenly decides to close the
connection (for whatever reason). I detect it (pbuf==NULL) and I call
tcp_close() and do some cleanup.

Some small time later my client needs to talk to the server again, it sees
the connection was closed (I use a global state structure) and tries to
reconnect. The connection cannot be established anymore (dunno why) so it
hangs at that point.

This scheme has worked in the past (although code was a little different) so
maybe it is my mistake, but because I dont know what to do exactly it is
still guesswork from my point of view.

Is there anybody who can show some client code (using raw api) which
connects to a server when it needs to talk, and when the server closes the
connection, then the client tries to reconnect the next time it needs to
talk ?

***************

I am using lwip 1.0.0 and I have ported it to a 32bit machine. I did need to
tweak the code for the misaligned address reads, but I still think I have
missed something (because on a rare occasion the data gets corrupted on the
other end).

Is there anybody who also has ported lwip to a 16bit or 32bit machine? And
what routines have been modified? Perhaps it would be interesting to have a
small section on the lwip website which explains which routines/code needs
to be altered for 16/32 bit machines, and perhaps show some modified code
already (i.e. which uses byte accesses instead of 16/32 bit access for
example).

 

Rgs Bonny,