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RTC and sleep mode

Hi everyone,

I am developing a quick evaluation demo for a low-power sensor node which consists of the following steps:

- read a couple of GPIOs

- set advertising name based on their status and advertise for X amount of seconds

- Once advertising is done, setup RTC/ other timer to generate an interrupt after Y time

- Go to lowest sleep state while keeping the timer on

- Wake up and start the process again

Does anyone know how to do the last three steps? Note that this module may be put to sleep for weeks for the application.

I am using the S140 device.

Thank you all