[BLE] When can I use 'aci_gap_get_security_level' command?

[DS.4]

After connection?

Or after pairing?

[Hdd]

Normally, you need to use this function to check the connection type, including security and encryption, before proceeding with the connection. Therefore, you should use this function during the search phase

[Hdd]

please refer to this post: Solved: BLE: detect security level - STMicroelectronics Community