This static function was a leftover from very early stages of this
example and at the current state there is not sense in keeping it.
Having these few lines directly where the advertising is triggered
makes the code more clean and readible.
Extend this application with 2 custom BLE characteristics. One is
read-only and returns a string including a random number and the
second one is writable. In addition, two characteristics for device
information were added (model and manufacturer). Access to the
characteristics produces output on the terminal.
