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If you walk the controller, you might see some of the other ones that might work for you. You might stumble across SNMPv2-SMI::mib-184.108.40.206.220.127.116.11 (18.104.22.168.22.214.171.124.126.96.36.199.1). This will return the IOS version you are currently running on the WLC.
[dhanson@s-tx-nettools ~]$ snmpwalk -v 3 -u snmp_user -l AuthPriv -a SHA -A <hidden> -x AES -X <hidden> <hostname> 188.8.131.52.184.108.40.206.220.127.116.11.1
SNMPv2-SMI::mib-18.104.22.168.22.214.171.124 = STRING: "126.96.36.199"
This same MIB should also work with a V2 community if you're using that.
Also, when you set this up, just make sure you go to "Advanced Options" on the UnDP create page and select SNMP Get Type "GET".
Hope this helps!