snmp and the dude.

Hi guys, im trying to see if the dude can moniter bandiwdth usage via SNMP for me.

I have tried using both a RO and a RW user, but the snmp-walk on the dude doesnt find any OID values for me.
any suggestions? can someone point me at a doc that helps out?

Have also entertained the idea of doing bandwidth onforcement by exporting netflow from the mikroti routers that feed my PMP320 ap’s, but unfortunetly I cant find a netflow collector that keeps historical data.

Also open to any other possible method of user bandwidth enforcement. (so I can charge for overages)