BOND_BONDING
Bonding is currently in progress with the remote device.
The devices are actively exchanging security keys. This process may involve user interaction (such as PIN entry or passkey confirmation) depending on the security requirements of both devices.
This is a transient state that will resolve to either BOND_BONDED (on success) or BOND_NONE (on failure or cancellation).
This state corresponds to BluetoothDevice.BOND_BONDING.