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BTOOL下USB_Dongle连接成功后立刻自动断开



USB_Dongle(烧录HostTestRealse)插上电脑在BTool里面打开,去连接从机(烧录SimpleBLEPeripheral),但是连接上后立刻断开(如下图)。请问可能是什么原因导致的?是USB_Dongle代码的问题吗?