Has this device ever been discovered by OCI successfully (i.e, did a recent firmware upgrade cause OCI to stop discovering it)?
I ask because this looks like a generic SNMP timeout - i.e, as SNMP is UDP based, it is fairly typical for no response whatsoever to come back from a SNMP query if *ANY* of:
the community string is wrong
The device has an ACL blocking SNMP or there is a firewall between the AU and the device
The device is configured to only support SNMPv3
The device has not have SNMP support enabled
We ship a snmpwalk tool to allow you to try to diagnose SNMP issues in a CLI shell - if you see the same type of response with our walk, you need to look at all of those aspects I cited