Nope, the code is not advertising properly.
The nrf52 is capable of 5nA when in deep sleep (meaning: everything is turned off and the MCU is listening to external pins to wake it up).
The deep_sleep.ino sample is supposed to show the consumption when the module is advertising and taking advantage of the System On mode, which should be around few uA according to this.
I will keep digging, something doesn’t quite add up yet.
@Dr_Blueble if you run the above mentioned sample with the default bootloader, what is the consumption you measure?
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