{"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.

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.