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並前往https://ubidots.com/community/t/for-review-esp32-fails-to-connect-to-ubidots-mqtt-broker-rc-2-and-rc-4-failure-modes/1672

2 and rc=-4 failure modes - IoT Devices - Ubidots Community

To connect the ESP32 over MQTT you can refer to this guide, which provides a detailed explanation of how to establish the communication with the Ubidots Broker.

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