Restart mac blutooth service
Sometimes my mac’s blutooth gets stuck, and I cannot attach any blutooth device nor turn it off and on. So, instead of restarting the laptop the following two commands fixes the problem.
To turn it off
sudo kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
To turn it on
sudo kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport