code: def format_config(sensor_graph):
      
  
      cmdfile = CommandFile("Config Variables", "1.0")
  
      for slot in sorted(sensor_graph.config_database, key=lambda x: x.encode()):
          for conf_var, conf_def in sorted(sensor_graph.config_database[slot].items()):
              conf_type, conf_val = conf_def
  
              if conf_type == 'binary':
                  conf_val = 'hex:' + hexlify(conf_val)
  
              cmdfile.add("set_variable", slot, conf_var, conf_type, conf_val)
  
      return cmdfile.dump()
docs: Extract the config variables from this sensor graph in ASCII format.
  
      Args:
          sensor_graph (SensorGraph): the sensor graph that we want to format
  
      Returns:
          str: The ascii output lines concatenated as a single string