Normal status, IPhone connects the external equipment through the USB interface, the iphone battery icon flashes the state of charge and then restores the original state, Then App received EAAccessoryDidConnectNotification callback,Then start data interaction. But in iOS 14 and later system(Test is 14.6 and 14.7)Sometimes the charging state does not disappear, EAAccessoryDidConnectNotification Callback is not received, Data interaction also cannot be performed.