2.2.1.2.4 AckOfAcks Payload
The AckOfAcks payload carries information about the lowest unacknowledged packets on the Sender side. The presence of this payload is flagged by the AOA (0x08) flag in the header (section 2.2.1.1), and it is sent by the Sender to inform the Receiver to update the Receiver Window (section 3.1.1.2.2) so that the Receiver can avoid sending redundant information in the acknowledgment vector packets (section 2.2.1.2.6).
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AckOfAcksSeqNum |
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AckOfAcksSeqNum (2 bytes): A 16-bit unsigned integer that specifies the lower 16 bits of the sequence number the Sender is waiting to receive acknowledgment of. The Receiver can infer that the Sender has received the acknowledgments for the packets with earlier sequence numbers, and updates its Receiver Window (section 3.1.1.2.2) accordingly.