new_contents: from experiment_config_lib import ControllerConfig
  from sts.topology import MeshTopology
  from sts.control_flow import Fuzzer
  from sts.input_traces.input_logger import InputLogger
  from sts.invariant_checker import InvariantChecker
  from sts.simulation_state import SimulationConfig
  
  # Use POX as our controller
  command_line = "./pox.py --verbose --no-cli openflow.of_01 --address=__address__ --port=__port__ sts.syncproto.pox_syncer samples.topo forwarding.l2_multi messenger.messenger samples.nommessenger"
  controllers = [ControllerConfig(command_line, cwd="pox", sync="tcp:localhost:18899")]
  
  topology_class = MeshTopology
  topology_params = "num_switches=4"
  dataplane_trace = "dataplane_traces/ping_pong_same_subnet_4_switches.trace"
  
  simulation_config = SimulationConfig(controller_configs=controllers,
                                       topology_class=topology_class,
                                       topology_params=topology_params,
                                       dataplane_trace=dataplane_trace)
  
  control_flow = Fuzzer(simulation_config, check_interval=1, halt_on_violation=True,
                        input_logger=InputLogger(),
                        invariant_check=InvariantChecker.check_liveness)
  
subject: Add configuration file for Andrew to test changes on