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utp

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Package utp implements uTP, the micro transport protocol as used with Bittorrent. It opts for simplicity and reliability over strict adherence to the (poor) spec.

Supported

  • Multiple uTP connections switched on a single PacketConn, including those initiated locally.
  • Raw access to the PacketConn for non-uTP purposes, like sharing the PacketConn with a DHT implementation.

Implementation characteristics

  • Receive window size is used to limit out of order packets received.
  • There is no MTU path discovery. The minimum size is always used.
  • A fixed 64 slot selective ack window is used in both sending and receiving.
  • All received non-ACK packets are ACKed in response.

Patches welcomed.