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When an ACK frame (section 2.2.4) arrives, the data associated with the messageid in the acknowledgment (ACK) message and any earlier messageids MAY be discarded.
When a NACK frame (section 2.2.3) arrives, the data associated with the messageid-1 in the NACK frame (section 2.2.3) MAY be discarded. Any other data is indicated as received, but the presence of a 0 bit in the NACK mask can also be discarded. Any other data MUST be retransmitted.