With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dlswTConnTcpConfigKeepAliveInt
dlsw T Connection Tcp Config Keep Alive Int
1.3.6.1.4.1.2011.2.34.2.4.1.1.1.1
The time in seconds between TCP keepAlive messages when no traffic is flowing. Zero signifies no keepAlive protocol. Changes take effect only for new TCP connections.
Back to DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor dlswTConnTcpConfigKeepAliveInt 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.