def METHOD_NAME(mobile_device_id=None):
    if str(mobile_device_id).isdigit():
        mobile_device_id = int(mobile_device_id)
    else:
        logger.error("Tautulli MobileApp :: Unable to retrieve mobile device config: invalid mobile_device_id %s." % mobile_device_id)
        return None
    db = database.MonitorDatabase()
    result = db.select_single("SELECT * FROM mobile_devices WHERE id = ?",
                              args=[mobile_device_id])
    if result['onesignal_id'] == _ONESIGNAL_DISABLED:
        result['onesignal_id'] = ''
    return result