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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
yes, on nrf5x platform it works automatically out of box, it sleeps almost always. I got to the point that my simple watch app checking for button (and RX pin of serial console) lasts 30-40 days just sitting on the table with bluetooth advertising on (= default state).
You can verify it by setting busy or sleep indicator (not sure what is the difference)
https://www.espruino.com/Reference#l__global_setBusyIndicator
https://www.espruino.com/Reference#l__global_setSleepIndicator
temporarily to pin 25 which is vibration motor and see how long it vibrates when you interact with the watch.
However recently I tried espruino bootloader made for SDK12 and Softdevice 3.1.0 and I don't see such great power management with that now. I have same build of (latest) espruino for SDK11 and SDK12 and with exactly same javascript code the one with SDK12/SD3.x lasts days while SDK11 lasts weeks so I am investigating what is different. It is built from same git source the only difference seems to be the SoftDevice. I also tried to call NRF.sleep() on SDK12/SD3.x and it still discharges faster than SDK11 with advertising on. Will need more tests, maybe that DS-D6 used has already worse battery (it is the first DS-D6 I got). I don't have any measurement tools for such low currents so I just keep some idle on my desk and check battery voltage after few days.