def send_calibrate_barometer(self):
        """Request barometer calibration."""

        calibration_command = self.message_factory.command_long_encode(
            self._handler.target_system, 0,  # target_system, target_component
            mavutil.mavlink.MAV_CMD_PREFLIGHT_CALIBRATION,  # command
            0,  # confirmation
            0,  # param 1, 1: gyro calibration, 3: gyro temperature calibration
            0,  # param 2, 1: magnetometer calibration
            1,  # param 3, 1: ground pressure calibration
            0,  # param 4, 1: radio RC calibration, 2: RC trim calibration
            0,  # param 5, 1: accelerometer calibration, 2: board level calibration, 3: accelerometer temperature calibration, 4: simple accelerometer calibration
            0,  # param 6, 2: airspeed calibration
            0,  # param 7, 1: ESC calibration, 3: barometer temperature calibration
        )
        self.send_mavlink(calibration_command)