code: @Draft
      public static void recvMsg(ZMQ.Socket socket, int flags, Consumer<ZMsg> handler)
      {
          handler.accept(ZMsg.recvMsg(socket, flags));
      }
docs: This API is in DRAFT state and is subject to change at ANY time until declared stable
  handle incoming message with a handler
  
  @param socket
  @param flags see ZMQ constants
  @param handler handler to handle incoming message