With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
appnLsInXidBytes
appn Link Station In Xid Bytes
1.3.6.1.2.1.34.4.1.1.5.1.1.16
Number of XID bytes received. All of the bytes in the SNA basic transmission unit (BTU), i.e., all of the bytes in the DLC XID Information Field, are counted.
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IPHost Network monitor allows you to monitor appnLsInXidBytes on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.