Why my gateway can only connect to the Xiaomi band 2,

[1114752670@qq.com]

I've learned that the first time I made a successful connection, and later when I reconnected, because the connection was successful, I would print out the connection failure.
* arg: 1
* bool: true
* arg: 2
* nil
* arg: 3
* nil

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Thank you very much. I didn't expect it was because of such a simple question.