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並前往https://www.digikey.com/en/maker/projects/send-and-receive-messages-to-your-iot-devices-using-mqtt/39ed5690cc46473abe8904c8f960341f

Send and Receive Messages to your IoT Devices using MQTT

This sketch connects the ESP32 to a MQTT broker and subcribes to the topic room/light. When the button is pressed, the client will toggle between

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