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Possibly a bug in the µTP specs


Harold

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As it says here:

The number of bytes in-flight is cur_window.

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Unlike TCP, sequence numbers and ACKs in uTP refers to packets, not bytes.

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Each socket keeps a state of the next sequence number to use when sending a packet, seq_nr. It also keeps a state of the sequence number that was last received, ack_nr. The oldest unacked packet is seq_nr - cur_window.

If all three are true, this will be the end of the universe. seq_nr - cur_window mixes packets with bytes, and therefore means nothing.

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