How to connect Wi-fi Sonoff relay and light switch?
How to connect a Sonoff Wi-Fi relay and a key switch so that turning on or off the light of one of them, the other on / off automatically after the first?
And what kind of key switch were you going to connect so that it could turn on automatically and have wireless control? I do not see the realization of what you are asking. You can connect a conventional switch in parallel with your SonOff’s - then you can force the lamps to turn on even if the relay is disconnected. If you connect the switch in series, then you can forcibly turn off the light, and the relay will no longer respond to commands.
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