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  • It's just what sd_app_evt_wait uses, which is what Nordic use in their SDK.

    My understanding is that with the Nordic Softdevice you have to use WFE - at least that's what I found mentioned on Nordic Devzone. I could be wrong though?

    You'll see there's some code around there to go back to sleep immediately if nothing has come in for Espruino - but I believe that a lot of the time IRQs get fired in the softdevice to handle the radio side of things

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