How does the un-associated client details been seen in the RTLS server?
Once the RTLS server configuration is done on the controller (with "includeUnassocSta" knob enabled) and in the RTLS server, the RTLS location data feed in the controller will send info for associated and unassociated clients.
The unassociated client data is based on probe request information.
The associated client data is based on management and data frames excluding probe requests.
The includeUnassocSta flag will cause the unassociated client device data to be included in the feed.
In this case, unassociated clients mean devices that are not associated to any AP.