docs: def send_frame(self, frame):
          """ Sends a frame to connected socket client.
  
          @param frame: The frame to send.
          @type frame: C{stompclient.frame.Frame}
          """
          packed = frame.pack()
          if self.debug:  # pragma: no cover
              self.log.debug("SEND: %r" % packed)
          self.request.sendall(packed)