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lightblue 点击了Listen for Notify后,有数据读出来问题?

请问当手机APP,lightblue连接上从设备后,选择带notify属性的UUID,然后点击listen of notifications,这个时候有数据上报上来,而且是没点一次从机都有数据过来,不点或者一直监听就没有数据过来,请问这个在主机端做了什么动作,从机又是怎么实现的。