hello guys, i want to control my relay by mqtt broker, it's already subcribe the data from Soil Moisture Sensor, but the relay is always off this is the logic i use [image] this is the callback function void mqttCallback(char* topic, byte* message, unsigned int length) { Serial.print("Messag…

dynamicdave 11 May 2022 16:37 4

One of my IoT students was asking about nearly the same question that you posted on the forum.
He was using a Wemos D1 Mini - not sure what you are using. But I'm sure it could be adapted.

I've posted what we did on the forum as I think it might go some way to solving your problem.

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Controlling Relay using mqtt

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