[SNMP4J] EngineId Discovery Issue

[Brett Hall]

Hi, I'm using snmp4j 1.9.3.b (also tried 1.9.3.d).

To define Localized USM users when sending V3 Informs, I'm using
Snmp.discoverAuthoritativeEngineID()

I encountered an unexpected issue discovering a NET-SNMP 5.4.1
snmptrapd. My discover request takes the full timeout value to return.

I do get the engineId result.

Connecting up wireshark I noticed that two GET requests are sent out by
SNMP4J. NET-SNMP ignores the second GET.

Request 1: Inform with zero length engine ID noAuth/noPriv.
Response 1: Receive Report usmStatsUnknownEngineIDs and the discovered engineID

Request 2: Inform with discovered engine id, noAuth/noPriv.
Response 2: No response. PDU times out

1. Should the second request be sent at all?
    Snmp.ReportProcessor is coded to resend PDU in response to Report.
    Seems right for auto-discovery but not for manual discovery.

2. NET-SNMP seems also at fault.
    - NET-SNMP 5.4.1 (snmptrapd) times out.
    - MG-Soft MIB Browser (Trap Ringer) - Ok and returns
unSupportedSecurity level response.

Thoughts? Thanks.
Brett