docs: def stop_transmit(self, *ports):
          """ Stop traffic on ports.
  
          :param ports: list of ports to stop traffic on, if empty start on all ports.
          """
  
          port_list = self.set_ports_list(*ports)
          self.api.call_rc('ixStopTransmit {}'.format(port_list))
          time.sleep(0.2)