def set_set_point(self, param):
        """
        Sets the target temperature.

        :param param: The new temperature in C. Must be positive.
        :return: Empty string.
        """
        if self.temperature_low_limit <= param <= self.temperature_high_limit:
            self.set_point_temperature = param
        return ""
Sets the target temperature.

        :param param: The new temperature in C. Must be positive.
        :return: Empty string.