ChargingSettings
The device's charging-settings service (stay-on-while-charging and idle power-off). Both values live in device RAM: they survive a disconnect but revert to the defaults (off, 20 min) at power-off.
Properties
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power off after this many minutes switched on with no host connected (1..255; the timer stops while a host is connected).
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keep the headset on and connected while a charger is plugged in. Off (the default), plugging in a charger powers the ADC down, drops every connection and stops advertising for the whole charge. Set it BEFORE plugging in: the device acts on the charger within about 250 ms.