I can successfully put my Adafruit feather 32u4 FONA to sleep by using the Low-Power library: GitHub - rocketscream/Low-Power: Low Power Library for Arduino with the function: LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF); With an external interrupt the FONA wakes up again and is functional E…

Adafruit feather 32u4 FONA waking up

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