Beetle BLE Bluetooth Password

Hi there,

I bought a Beetle BLE and I'm developing an app to control may garage gate opener system.
I'ved run some test and this small beetle it's responding as I was hoping to.

But I'm newbie in Arduino and some things are not clear to me. So...
To get the project running I must avoid anyone without authorization from connect to Beetle BLE and open the gate.
The Beetle BLE has a password but change it won't avoid to use the basic bluno demo and connect to the board.

So, my question is: how to only accept authorized conncetions to my board?

Thank you!

best regards