Duplicate message in mqtt

Internet of Things IoT Frameworks 2 years ago

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_x000D_ _x000D_ I have issue when using npm mqtt with nodejs. Sever subscribe topic 'alert/userId' to receive data publish from client then server unsubscribe this topic . after each subscribe and unsubscribe message is duplicate. The client sends 1 message; the server receives more 1 message.

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manpreet Tuteehub forum best answer Best Answer 2 years ago
_x000D_ How did you publish the message? Did you set the retained flag to true? If so this message will be delivered every time the client connects to the broker until it is cleared (by sending a null payload message to the same topic)
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