[Xymon] Monitoring Wifi connections

Hi, can anybody help me?

I have created a script for xymon to monitor how many gadgets connect to our Sisco Wifi routers, both per router and per Ssid.

I use snmp with this OID: "1.3.6.1.4.1.14179.2.1.1.1.38" to find the number on each of the Ssid:s and add them up.

I use these OID:s: "1.3.6.1.4.1.14179.2.2.13.1.4.$ID.0" and "1.3.6.1.4.1.14179.2.2.13.1.4.$ID.1" to find the number of gadgets connected to the router with "$ID". Then I add them all up.

The two sums are widely different where the Ssid sum is from 10 to 30 fewer.

What am I doing wrong? Should the sums not show the same number of connections?

Thanks

Maria