[lwip-devel] [bug #27445] PCB hangs in Fast Retransmit due to unchanging cwnd

[Oleg Tyshev]

Follow-up Comment #14, bug #27445 (project lwip):

Ok, now we have Clause 2
"length of received packet is zero (i.e. no payload)"

It means that we should our self generate _zero length_ ACK for each new
segment in out of sequence queue.
But now we call tcp_ack_now(pcb).
If unsent queue has something, we send non zero length ACK.

Actually in RFCs I didn't found mentioning about zero length ACK,
only Stevens.

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