Initializer
init(snd_wl1:snd_wnd:max_window:rcv_wnd:rcv_wup:)
init(snd_wl1: UInt32, snd_wnd: UInt32, max_window: UInt32, rcv_wnd: UInt32, rcv_wup: UInt32)Initializer
init(snd_wl1: UInt32, snd_wnd: UInt32, max_window: UInt32, rcv_wnd: UInt32, rcv_wup: UInt32)