How can I connect XBEE to a smartphone using BLE

I want to connect smartphone and XBEE with BLE.
But SRP protocol is too difficult to understand.
Is there a way to easily authenticate with SRP?
Digi’s official smartphone app can connect, so there should be some way to do it

Digi’s mobile app connect with XBee3 mobiles using GATT services as described here:

Do you have the answer to this problem? Can I consult the results?