protected void onServicesInvalidated() {
		// Don't call super.onServicesInvalidated() when overriding this method.
		requestHandler.onServicesInvalidated();
	}
This method should nullify all services and characteristics of the device.
<p>
It's called when the services were invalidated and can no longer be used. Most probably the
device has disconnected, Service Changed indication was received, or
{@link #refreshDeviceCache()} request was executed, which has invalidated cached services.
ble/src/main/java/no/nordicsemi/android/ble/BleManager.java