[SNMP4J] Difficulty with SNMP v3 Set

[McCarthy, Peter CIV NAWCTSD, 4.6.2.3]

Hello all,

I'm having difficulty with sending SNMP v3 sets to a secured (MD5/DES
such as it is) power strip.  Code (largely taken from the get example in
the documentation) is at the bottom:

If I uncomment the GET STUFF section and comment out the SET STUFF
section, everything works and all the correct data is returned.

If I uncomment the SET STUFF section and comment out the GET STUFF
section, no errors are returned.  However, the setting is not
placed on the device (verified through the device's web interface).

When I used Wireshark, I noticed on when a set message is sent, neither
the authoritative time nor boot count is placed in the outgoing set
request.

Message flow, per Wireshark, looks like

     (1) Outbound, generic set or get message
     (2) Inbound,  1.3.6.1.6.3.15.1.1.4 (unknown engine)
     (3) Outbound, some encrypted PDU
     (4) Inbound,  response PDU

Occasionally (rarely), there is another pair of messages between (2) and
(3), namely:

     (2a) Outbound, some encrypted PDU
     (2b) Inbound, 1.3.6.1.6.3.15.1.1.2 (not in time window)

If the "not in time window" appears, message (3) above will have
authoritative time and boot count populated.

Am I doing something wrong here?

Thanks,

Peter...

        Address targetAddress =
GenericAddress.parse("udp:192.168.1.107/161");
        TransportMapping transport = new DefaultUdpTransportMapping();
        Snmp snmp = new Snmp(transport);
        MPv3 mpv3 =
                (MPv3)
snmp.getMessageProcessingModel(MessageProcessingModel.MPv3);
        USM usm = new USM(SecurityProtocols.getInstance(),
                new OctetString(mpv3.createLocalEngineID()), 0);
        System.err.println("Enabled? " +
usm.isEngineDiscoveryEnabled());
        SecurityModels.getInstance().addSecurityModel(usm);
        transport.listen();

        // add user to the USM
        snmp.getUSM().addUser(new OctetString("usernamehere"),
                new UsmUser(new OctetString("usernamehere"),
                AuthMD5.ID,
                new OctetString("passwordhere"),
                PrivDES.ID,
                new OctetString("passwordhere")));
        // create the target
        UserTarget target = new UserTarget();
        target.setAddress(targetAddress);
        target.setRetries(1);
        target.setTimeout(5000);
        target.setVersion(SnmpConstants.version3);
        target.setSecurityLevel(SecurityLevel.AUTH_PRIV);
        target.setSecurityName(new OctetString("usernamehere "));
        

        // GET STUFF
//        PDU pdu = new ScopedPDU();
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.1.2.0")));
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.1.3.0")));
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.1.5.0")));
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.1.1.0")));
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.3.3.1.1.4.2")));
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.3.3.1.1.4.3")));
//        pdu.add(new VariableBinding(new
OID("1.3.6.1.4.1.318.1.1.12.3.4.1.1.4.2")));
//        pdu.setType(PDU.GET);
        
	  // SET STUFF
        PDU pdu = new ScopedPDU();
        OID o1 = new OID("1.3.6.1.4.1.318.1.1.12.3.4.1.1.4.2");
        Integer32 i32 = new Integer32(32);
        pdu.add(new VariableBinding(o1, i32));
        pdu.setType(PDU.SET);
        
        // send the PDU
        ResponseEvent response = snmp.send(pdu, target);
        // extract the response PDU (could be null if timed out)
        PDU responsePDU = response.getResponse();
        System.err.println("Error status: " +
responsePDU.getErrorStatus());
        if(responsePDU != null) {
            for (VariableBinding b : responsePDU.getVariableBindings())
{
                System.err.println(b.toString());
                
            }
        }