We have installed Netsight with version 18.104.22.168 and EWC with version 10.21.04.0005. Netsight can discover switches and NAC appliances using snmpv3 credentials. But we can not add wireless controller using same snmpv3 credentials.
Netsight is not at the same Vlan with Controller or other devices, but they are all reachable. EWC can ping Netsight from data and management IPs.