Controller Based WLANs

Environment- This article is applicable to controllers running 6.3.x

Answer- Requirement:-
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For instance we have some users with Android devices running specific application (connects to a cloud server) that does not support roaming. If the client roams between APs then connection is dropped. Its possible these clients are within a specific area.

Answer:-
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There is no configuration that would allow the controller to only allow a client to connect to a specific SSID. There are utilities/apps out there that can be installed on the client that can lock it to a certain BSSID.
 
If you want the controller to NOT make any client moves using clientmatch, you can add the client to the clientmatch unsupported list. 

Workaround:
Disable ARM on the controller so it doesn't de-auth clients.
Install an app on the device to bind to specific AP. 
Since its more of poor design it needs to be addressed with App developers

Related Links- https://arubanetworkskb.secure.force.com/pkb/articles/FAQ/HOW-TO-DISABLE-CLIENT-MATCH-FOR-A-SPECIFIC-CLIENT