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To apply flow control the receiver should apply BUSY flag to outgoing data segments (if there are any) or periodically send ACK segments with BUSY flag (recommended period Retransmission Timeout/2). The received busy flag will reset the re-transmission timer of PEER transmitter. The flow control example is shown below.

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In Figure A) the Receiver 2 is busy and, to keep the Transmitter 1 from re-transmitting its Tx buffer, it periodically sends the ACK segments with BUSY flag. The BUSY segment has an ACK number of the last received segment before the receiver was busy (202). And a SYN number of the next data to be sent in the opposite direction.

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