Setting this variable to performCalibration(2) causes
the UPS to discharge to calibrate the UPS.
The test will only start if the battery capacity is 100%.
The test runs until capacity is less than 25%.
Setting this variable to cancelCurrentCalibration(3)
after setting performCalibration(2) will cancel the
current discharge.
Setting this variable to noPerformCalibration(1)
will have no effect.
The value noPerformCalibration(1) will always be returned
when the variable is read.
The result of the calibration will be saved in
upsAdvTestCalibrationResult.