One year on from the last review... are the locks still in development? Can't find any mention of Bluetooth or BLE on web sites that actually sell Xena locks.
Do you actually sell any locks to go with this App? The App's a great idea, but I can't find anywhere that sells the locks, and the app is not much use without the lock.
battery usage improvement
Scan and discover your Bluetooth low energy devices with nRF Connect for Mobile.
Bluetooth Low Energy(4.0) Scanner: Read,Write,Notify, Services & Characteristics
CySmart™ is a Bluetooth® Low Energy utility developed by Cypress Semiconductor.