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How to know if a Bluetooth Device is Connected in iOS?

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Is there a way to know on how a Bluetooth Device is already connected? I am using CBCentralManager to identify if the Bluetooth is Powered ON but I am unable to find out on how I can identify If a Bluetooth Device is already connected.

I am implementing routing of AVAudioSession Calls via a Connected Bluetooth device but AudioSession Category changes are getting called repeatedly due to which I am unable to find if a Bluetooth Device is connected or not. If anyone have tried to implement this behaviour, Your inputs might be helpful. Please share the information.

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