I use lwip in a embedded system, one time I have got this the following message:
"tcp_enqueue: no pbufs on queue => both queues empty"
Exactly on this line:
LWIP_ASSERT("tcp_enqueue: no pbufs on queue => both queues empty",
pcb->unacked == NULL && pcb->unsent == NULL);
I had this problem recently, and it was down to my setting for
TCP_SND_QUEUELEN. This must be less than 256, because the data type used
for storing the queue length (snd_queuelen) is 8 bits. Any larger and
the snd_queuelen counter will overflow.
Hope this helps,
Kelvin.
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