[lwip-users] netconn, large packets causing trouble

[Bastiaan van Kesteren]

Hi,

When I try to transmit large(ish) packets using the netconn api, I get 
into trouble; the connection blocks (no packets getting out), and 
eventually I run into some random assertion (they tend to change 
depending on packet size and point in time).

Too me this looks like a buffer-overflow somewhere, but I'm not sure 
where to begin. Any LwIP master around willing to give some pointers?


Right after the too-big packet transmission, the LwIP sys-stats and 
memory stats don't show anything strange, although after some more time 
the mbox.err counter starts to go up, as long as I don't hit an assert.

I'm Using LwIP 1.4.1 with FreeRTOS on a LPC1768 (Cortex-M3). Own 
hardware, own port (combination of bits and pieces). I think the port is 
good, in that sense that we're already using it for a few years without 
any problems, Uptimes of a year or more. But all these applications are 
using small packets, so a bug in the port is definitely a possibility.

Any pointers are appreciated, if more info is needed I'll be more that 
willing to fill in.

Regards,
-Bastiaan