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

[Kieran Mansley]

Follow-up Comment #1, bug #28106 (project lwip):

Yes, that's an interesting case, and I agree with your deduction.  It's not
just necessary because of the change to our stack, many other stacks will have
this requirement for an ACK to be seen as a duplicate.

We currently have no function to send a pure ACK with no data, but it is
necessary in this case.

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