Add support for customising KCP connection settings for server and client.

[RealistikDash]

Currently, all connections use the default KCP settings without allowing for customisation. This change should allow the user to call a function to customise the creation of all new KCP connections.

[nominalval]

Yes.

Would be fine if you could add at least those options :

ikcp_wndsize(kcp1, 128, 128);
ikcp_nodelay(kcp1, 0, 10, 0, 1);

[RealistikDash]

Will do today

[RealistikDash]

Actually, it appears this was already implemented in 69046130e76322be09275e59d4800b0093b4da6c and 3099f62ec8f83b9fd831e8253f4cce1bc6e6c016. It appears I forgot to close this.

This means that it is already possible to customise these settings. For KCPClientSync, it is done through the constructor:

    def __init__(
        self,
        address: str,
        port: int,
        conv_id: int,
        no_delay: bool,
        update_interval: int,
        resend_count: int,
        no_congestion_control: bool,
        receive_window_size: int,
        send_window_size: int,
    ) -> None:

For KCPServerAsync, you have two options:

• In the constructor:

  def __init__(
      self,
      address: str,
      port: int,
      conv_id: int,
      delay: int = 100,
      connection_timeout: int = 600,
      max_transmission: int = 1400,
      no_delay: bool = False,
      resend_count: int = 2,
      no_congestion_control: bool = False,
      receive_window_size: int = 128,
      send_window_size: int = 32,
  ) -> None:

• Using set_performance_options:

  def set_performance_options(
      self,
      no_delay: Optional[bool] = None,
      update_interval: Optional[int] = None,
      resend_count: Optional[int] = None,
      no_congestion_control: Optional[bool] = None,
      receive_window_size: Optional[int] = None,
      send_window_size: Optional[int] = None,
  ) -> None:

Hope this helps!