val available : t -> int32val wait_for : t -> int32 -> unit Lwt.tval wait_for_flushed : t -> unit Lwt.tval write : t -> Cstruct.t list -> unit Lwt.tval write_nodelay : t -> Cstruct.t list -> unit Lwt.tval free : t -> int -> unit Lwt.tval reset : t -> unit Lwt.t