The companion protocol reports only a battery voltage, so charging is a
voltage-trend inference. Some devices could instead expose the standard
GATT Battery Service (0x180F) whose Battery Level Status characteristic
(0x2BED, Battery Service 1.1) carries a real, firmware-reported charging
flag. Dumping the GATT table shows no current MeshCore build implements
it — the BLE profile is just the Nordic UART pipe plus DFU — but wire it
up now so it lights up automatically the day one does.
get_hw_charging() reads 0x2BED best-effort over BLE (reaching the bleak
client the forced-teardown path already uses) and prefers its flag; any
failure — service absent, read refused, short value, non-BLE transport —
is a quiet None, so the poller falls back to the inference and every
current device behaves exactly as before. Verified against a live device:
the read resolves and returns a clean, steady None. The 0x2BED bitfield
decode is a pure function unit-tested against the spec's Charge State enum
so the parse is correct ahead of any hardware that populates it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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