code: def start_traffic(self, blocking=False, *ports):
          
  
          self._traffic_command('on', *ports)
          if blocking:
              self.wait_traffic(*ports)
docs: Start traffic on list of ports.
  
          :param blocking: True - start traffic and wait until traffic ends, False - start traffic and return.
          :param ports: list of ports to start traffic on. Default - all session ports.