[lwip-devel] [bug #28106] duplicate acknowledge for fast retransmit could have not null length

[Oleg Tyshev]

Follow-up Comment #7, bug #28106 (project lwip):

tcp_send_empty_ack() clears TF_ACK_NOW and TF_ACK_DELAY
It means that only 2nd received data segment will be acknowledged and
tcp_fasttmr() won't send delayed for sending data.

Other hand with cleared flags we can avoid sending data interleaved with
duplicated ACK (see comment#3).

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