{"NAME":"Sonoff S31","GPIO":[17,145,0,146,0,0,0,0,21,56,0,0,0],"FLAG":0,"BASE":41}

For more accurate energy consumption measurements this device requires power monitoring calibration.

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Serial Flashing

Complete guide on Tasmota Docs

Buying Advice

When ordering check if it is indeed Sonoff S31 and not Sonoff S31 Lite which does not support power monitoring.