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关于CC2540接收到WRITE_REQ之后,多久回复WRITE_RSP??

在SimpleBLEPeripheral工程中,当从机接收到主机发过来WRIRE_REQ之后,在哪里可以改变从机回复WRITE_RSP的时间。在simpleProfileChangeCB()中,让特征值1接收到数据后,发送NOTIFY到特征值4.使用sniffer抓包的时候。每次都是 WRITE_REQ ->NOTIFY->WRITE_RSP.而且在WRITE_REQ跟NOTIFY之间,还有几个空闲包。为什么?