I'm new to this mailing list list so I don't know if this has been covered yet.
If so, I apologize.
This is a bug report. Using SNMP4j v1.11.3 if you send an SNMP v3 Inform and
pdu.isConfirmedPdu() returns false then it creates an asynchronous pending
request and registers a timer for it then it also performs a synchronous send
on the inform. The result is that duplicate messages are sent a few seconds
apart from each other.
The relevant code is in MessageDispatcherImpl lines 458 - 462:
458 if (pduHandleCallback != null) {
459 pduHandleCallback.pduHandleAssigned(pduHandle, pdu);
460 }
461 byte[] messageBytes = outgoingMessage.getBuffer().array();
462 sendMessage(transport, transportAddress, messageBytes);
Line 462 should not get called on asynchronous calls.
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