@Deprecated
	protected void onDeviceDisconnected() {
		// empty
	}
This method should nullify all services and characteristics of the device.
<p>
It's called when the device is no longer connected, either due to user action
or a link loss, or when the services have changed and new service discovery will be
performed.

@deprecated Use {@link #onServicesInvalidated()} instead.
ble/src/main/java/no/nordicsemi/android/ble/BleManagerHandler.java