Wenxiang Wang comments

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                                            Wenxiang Wang

![image](https://github.com/Jasonchenlijian/FastBle/assets/7984975/7e8d0aa8-70e9-4e85-b34a-878a9e3e9989) 这里mCharacteristic不是已经赋值了吗

连接上后，扫描到服务，再开启通过，这里应该不可能空 ![image](https://github.com/Jasonchenlijian/FastBle/assets/7984975/ad455acd-0dc4-4817-80c0-d9034c0882b1)