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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.
@Robin
Fri 2020.04.17
Found the link using a setWatch and setInterval to respond and wake the device:
entire thread
Not sure how to get NRF back up and running. There are functions to keep power usage down (broadcast distance), that would assist as the phone would then be near, once discovered.
This may be opposite direction, as is 'Pull' needed?
Technical Article on the behind the covers BLE