What model WLC are you using? The SNMPWalk is certainly a good starting point. You can attempt to dig through the MIBs provided by Ciscos Website and attempt to identify what you're needing from that. I personally was overwhelmed by the information available but it can be learned with time and effort.
AireOS 3504 WLC - This Cisco link has some OIDs listed that may be useful.
Paessler SNMP Tester - Here is a useful SNMP Tool you can leverage if Lansweeper Device Tester is not your preference.
Cisco Forum - Here is a Community Post that contains 2 MIBs that may prove useful for you.
Cisco MIB Navigator - Here is the MIB Navigator for Cisco that you should use to investigate and test further.
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