How to capture Bluetooth notifications on Mac and iOS?

I want to capture Bluetooth "Classic" device notifications on both Mac and iOS platforms primarily when:

1. Bluetooth is turned on/off
2. When a device gets connected/disconnected to Bluetooth

On Mac:

I used the IOBluetooth framework in Mac for this by registering for two notifications:

registerForConnectNotifications registerForDisconnectNotifications

However, the issue with this is that notifications get triggered even when a connect request happens with the device. (For ex: I pressed connect for connecting with headphones and a notification is received even though it failed to connect to the device for whatever reason).

I need the notification to be received only when the device is successfully connected with the system.

On iOS:

I am not sure which framework to go with - whether CoreBluetooth or External Accessory. I did read that CoreBluetooth supports classic devices but not every device. I would appreciate any insight or help on this topic.