type 'x send
type 'x recv
type error
val pp_error : error Fmt.t
val encode_without_tls : Colombe.Encoder.encoder -> 'x send -> 'x -> (unit, [> `Protocol of error ]) Colombe.State.t
val decode_without_tls : Colombe.Decoder.decoder -> 'x recv -> ('x, [> `Protocol of error ]) Colombe.State.t