How to implement resolvable and non-resolvable private addresses in the BlueNRG-2 module using Keil?

Hi, i am new to using ST boards. I am using a broadcaster which only sends data after every particular interval. I want to use resolvable and non resolvable private address techniques to secure the data sent and direct it only a particular user and not accessed by other. Can I please know how to implement it in Keil. I am having trouble in programming it. And if there are any suggestions on other better ideas to secure please let me know. I am open to new ideas.

Thank you.