[bluez/bluez] 27acde: battery: improve the display of the charge level

[bluez/bluez] 27acde: battery: improve the display of the charge level

[RSmirnov512]

  Branch: refs/heads/1016339
  Home:   https://github.com/bluez/bluez
  Commit: 27acde77a800c318d8545b4623d0547f5c3d0b3d
      https://github.com/bluez/bluez/commit/27acde77a800c318d8545b4623d0547f5c3d0b3d
  Author: Roman Smirnov <r.smirnov@omp.ru>
  Date:   2025-10-27 (Mon, 27 Oct 2025)

  Changed paths:
    M src/battery.c

  Log Message:
  -----------
  battery: improve the display of the charge level

The battery charge level may fluctuate due to uncalibrated
sensors. Commit smooths out such fluctuations.

The algorithm for determining uncalibrated sensors consists of
finding the number of changes in charge direction (i.e., "spikes").
If the number of spikes is zero, the device is charging or discharging.
If there is one spike, it may mean that the device has started charging
or has been disconnected from charging. If there are two or more
spikes, this is a clear indication of an uncalibrated sensor.

Check that the battery charge is fluctuating. If the battery charge
is fluctuating, use the average charge value, otherwise use the current
value.

Fixes: https://github.com/bluez/bluez/issues/1612



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