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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.
@Gordon
As far as I can tell there isn't a way - there's some kind of 'sleep mode', but that may not be enough.
It's easy enough to wire that pin up to Espruino - and then I think you use
digitalPulse(pwr_pin, 1, 2000)- the pin actually needs a pulse on it for ~2 seconds to wake/sleep the SIM800.