Connection without pairing feature

Hi, I'm currently developping my first app in java.

This app requires a direct connection with my BL652, which doesn' t accept any kind of pairing option. That being said, I tried using the source code of the app Nrf Connect, named NRF Toolbox, but wasn't quite sucessful finding any source of the connection only feature. If it would be possible to give me a link or an example of how this feature is done, or maybe if I'm just not finding it in the source code the part where you do this connection and could help, I would be really grateful. Thanks in advance for any response.

Best Regards, Pedro Miranda.