code: def load_key_file(self):
          
          self.client_key = None
          if self.key_file_path:
              key_file_path = self.key_file_path
          else:
              key_file_path = self._get_key_file_path()
          key_dict = {}
  
          logger.debug('load keyfile from %s', key_file_path);
  
          if os.path.isfile(key_file_path):
              with open(key_file_path, 'r') as f:
                  raw_data = f.read()
                  if raw_data:
                      key_dict = json.loads(raw_data)
  
          logger.debug('getting client_key for %s from %s', self.ip, key_file_path);
          if self.ip in key_dict:
              self.client_key = key_dict[self.ip]
docs: Try to load the client key for the current ip.