[lwip-devel] [bug #46289] tcp_write fails with ERR_MEM if TCP_SND_QUEUELEN is reached

[Sylvain Rochet]

Follow-up Comment #8, bug #46289 (project lwip):

That's not a very good idea, PBUF_POOL is meant to be used for TX packets
only.

The problem is, if your TX and RX path share the same pool, you can reach a
condition where all your buffers are used, most commonly with unACKed TCP data
but you are not able anymore to receive TCP ACK anymore to be able to free
some buffers.

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