docs: def start_capture(self, *ports):
          """ Start capture on ports.
  
          :param ports: list of ports to start capture on, if empty start on all ports.
          """
  
          IxeCapture.current_object = None
          IxeCaptureBuffer.current_object = None
          if not ports:
              ports = self.ports.values()
          for port in ports:
              port.captureBuffer = None
          port_list = self.set_ports_list(*ports)
          self.api.call_rc('ixStartCapture {}'.format(port_list))