Originally posted by MNB
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It looks like the Nest plugin has things well covered and your test confirms it will pick up a hardware failure or completely dead battery by reporting Offline in the root. It's not surprising that after removing the batteries the battery level hasn't changed because the device is no longer reporting but Nest have that covered by reporting it offline.
Next test would be to see if, with the "Do not update device last change time if device value does not change" unchecked for the root device, does the date get updated at regular intervals indicating that the online/offline status has been reported even though it hasn't changed.
Steve
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