[lwip-users] UDP flooding: PBUF_POOL leak?

[Gerhard Wallraf]

Hi all,

I'm currently experimenting with FreeRTOS 7.0.1 and lwip 1.3.2 on an AT91SAM7X microcontroller.

The project includes a UDP (SNTP server) socket, which has been implemented twice now: one time by

using the socket API and the other time using raw udp API with callback (via udp_recv() ).

When I start to bothering the UDP socket by sending messages towards it (running 50 NTP clients in parallel),

the output of PBUF_POOL statistics sooner or later shows lines like this even after stopping all clients:

MEM PBUF_POOL:

avail: 64

used: 31

max: 43

err: 4746

Socket-based UDP implementation pseudo-code is found at http://pastebin.com/NUFmX58p .

Please tell me what other information to provide if you'd like to help.

Thanks in advance,

Gerhard