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SendRRorRNR needs to acknowledge received I-frames (actually every packet needs to acknowledge received I-frames by sending the proper packet sequence number), so ReqSeq is set to the next I-frame number sequence to be pulled by the reassembly function. SendRRorRNR tells the remote side about local busy conditions, it sends a Receiver Ready frame if local busy is false or a Receiver Not Ready if local busy is true. ReqSeq is the packet's field to send the number of the acknowledged packets. Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>