Regulation : if process value is in deadband, the last output value must not be changed

def _do_regulation(self):
        failures_in = 0
        failures_out = 0

        while not self._stop_event.is_set():

            if self.input.allow_regulation():

                try:
                    self._last_input_value = input_value = self.input.read()
                except Exception as e:
                    failures_in += 1
                    if failures_in > self.max_attempts_before_failure:
                        raise TimeoutError(
                            "too many attempts to read input value, regulation stopped"
                        ) from e
                else:
                    failures_in = 0
                    power_value = self.pid(input_value)
                    # self._last_output_value = output_value = self._get_power2unit(
                    #     power_value
                    # )

                    if not self._x_is_in_idleband(input_value):
                        self._last_output_value = output_value = self._get_power2unit(power_value)
                        try:
                            self.output.set_value(output_value)
                            failures_out = 0
                        except Exception as e:
                            failures_out += 1
                            if failures_out > self.max_attempts_before_failure:
                                raise TimeoutError(
                                    "too many attempts to set output value, regulation stopped"
                                ) from e

            gevent.sleep(self.pid.sample_time)