claes 28e851c3fd Low battery level counter for NRF52 ...

Added a counter that counts low battery level detections.
If there are 4 in a row we go to deep sleep.
The battery sense on the RAK4631 seems to be a bit unstable and may
generate  'false' low voltage readings.
My RAK4631 has been running for 7 days now with this fix.
It did 3 days without it.
I still do not have a T-Echo so on that board IT IS NOT TESTED.
(But I hope it will improve things there too)

2021-09-19 16:00:10 +02:00

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