code: def param_fetch_all(self):
          '''initiate fetch of all parameters'''
          if time.time() - getattr(self, 'param_fetch_start', 0) < 2.0:
              # don't fetch too often
              return
          self.param_fetch_start = time.time()
          self.param_fetch_in_progress = True
          self.mav.param_request_list_send(self.target_system, self.target_componentf param_fetch_all(self):
          '''initiate fetch of all parameters'''
          if time.time() - getattr(self, 'param_fetch_start', 0) < 2.0:
              # don't fetch too often
              return
          self.param_fetch_start = time.time()
          self.param_fetch_in_progress = True
          self.mav.param_request_list_send(self.target_system, self.target_component)
docs: initiate fetch of all parameters