If your controller's logs have errors like this:
"SNMP agent timed out when sending a request to WMS"
"SNMP agent timed out when sending a request to STA"
that's a symptom of an internal timeout where the snmp server doesn't hear back from the specified module within 2 seconds. If you see them, you should make sure that AirWave's SNMP Retries setting is set to 3 or greater, to make sure that AirWave tries again when the controller's snmp server logs these messages.