The binding generates the xml file automatically after it has completed initialization for the device. For mains-powered devices, this usually happens in a matter of several seconds. For battery-powered devices, this can take a while as the device needs to wake up multiple times. You can speed this up by manually waking up the device multiple times.
So in the case of the Nanomote, try waking it up repeatedly until the xml file is created. If the Nanomote is anything like the Minimote and the Wallmote, those devices don’t wake up on their own, so it may require manual wake ups.