info.url0.singl is a HIM-Demo for BLE.

TODO:

1. 0XFFF1 write 1 to turn on device alarm.
2. when out of range (let said 95), turn on device alarm and also turn on iphone alarm if in forground, and show notifcation to view on app.
3. on-off guard is not correct so far.
4. set range is not available.