Grazie per la risposta.
Purtroppo dal sito ufficiale BluetoothDevice | Android Developers :
codice:
public static final int BOND_BONDED
Since: API Level 5
Indicates the remote device is bonded (paired).
A shared link keys exists locally for the remote device, so communication can be authenticated and encrypted.
Being bonded (paired) with a remote device does not necessarily mean the device is currently connected. It just means that the ponding procedure was compeleted at some earlier time, and the link key is still stored locally, ready to use on the next connection.
Constant Value: 12 (0x0000000c)
Come scritto sopra, l'attributo BOND_BONED nella classe BluetoothDevice non e' in relazione con un dispositivo connesso, ma con uno accoppiato al telefono.