InvalidMplexMsgType = object of MuxerError

MessageType {.pure.} = enum
  New, MsgIn, MsgOut, CloseIn, CloseOut, ResetIn, ResetOut

Msg = tuple[id: uint64, msgType: MessageType, data: seq[byte]]

MaxMsgSize = 1048576

proc newInvalidMplexMsgType(): ref InvalidMplexMsgType {....raises: [], tags: [].}

proc readMsg(conn: Connection): Future[Msg] {.stackTrace: false, ...raises: [],
    gcsafe, raises: [], raises: [], tags: [RootEffect].}

proc writeMsg(conn: Connection; id: uint64; msgType: MessageType;
              data: seq[byte] = @[]): Future[void] {....raises: [], tags: [].}

proc writeMsg(conn: Connection; id: uint64; msgType: MessageType; data: string): Future[
    void] {....raises: [], tags: [].}