Request the data of energy meter in Home Assistant(modbus/tcp), trigger the Sonoff in realtime.

Video tutorial about how to control a sonoff relay from a modbus tcp sensor in Home Assistant

The most advantage of the Modbus/TCP sensor in Home Assistant is it supports requesting the data every 1 second, which can be used as a real-time sensor feedback value in a control loop. The 1-second sample interval makes it can be used in many interesting things.


How to use the modbus tcp function in IAMMETER products

How to read the data of WiFi energy meter from the modbus tcp sensor of home assistant

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