Thanks David and Simon for these informations. Seems more clear in my mind now.
I tried to provide more MEM_SIZE memory without success. Finally I got my error, I wrote tcp_write instruction with pointer on a static memory. Removing the static solved my issue. - #define PBUF_POOL_SIZE 256 - #define PBUF_POOL_BUFSIZE 1700 [..] - The following line indicates me that the pbuf will be placed in RAM tcp_pbuf_prealloc(layer, length, mx, os, pcb, api, fst) pbuf_alloc((layer), (length), PBUF_RAM) Just to add to Simon's post: please be aware that PBUF_RAM allocations never draw from the PBUF POOL that you've defined above. If you want that to happen, define a custom pool instead, and (if relevant) avoid PBUF_POOL allocations in your own code. Otherwise you'll need a heap (ie MEM_SIZE). As far as I can tell, although I'd love to be corrected, there is no way to have a statically sized pool that is used for both PBUF_RAM and PBUF_POOL allocations. David
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