[SNMP4J] Problem with ResponseListener timeout (SNMP4J 1.9.3d)

[Frank Fock]

Hi Marcin,

I can confirm that SNMP4J 1.9.3d does not
call onResponse with a null response PDU
when there was a response != null before
on the same request.

Whether this is a bug or not is questionable
but I agree that having such a call can
simplify async listener programming and is
therefore desirable. I will try to restore
this functionality in 1.10.

Best regards,
Frank

Marcin Kokoszka wrote:
> I'm using SNMP4J v1.9.3d
> I'm not sure but probably I have found some error.
> I have a problem with ResponseListener and timeouts. I'm sending some
> request (broadcast address) to search SNMP devices through the network. With
> previous SNMP4J v1.8.1 everything was and there was ok -> timeout after few
> seconds and the message "end scan" was displayed but with new version of the
> SNMP4J it seems that something is wrong. I have waited for the message "end
> scan" but without any results. Do You have any idea?
> 
> UdpAddress targetaddress = new UdpAddress("255.255.255.255"+"/161");
> CommunityTarget target = new CommunityTarget();
> target.setCommunity(new OctetString(communityStringGet));
> target.setVersion(SnmpConstants.version1);
> target.setAddress(targetaddress);
> target.setRetries(1);
> target.setTimeout(timeout);
> 
> final PDU pdu = createPDU(target, PDU.GET);
> 
> for(int i = 0; i < vbs.size(); i++)
> {
>        pdu.add((VariableBinding)vbs.get(i));
> }
>  // sending request
>  ResponseListener listener = new ResponseListener()
>  {
>       public void onResponse(ResponseEvent event)
>       {
>             if(event.getResponse() != null)
>             {
>                  System.out.println(event.getPeerAddress().toString());
>             }
>             else
>              {
>                     System.out.println("end scan");
>                     snmp.cancel(pdu, this);
>             }
>        }
>  };
> 
>         try
>         {
>             snmp.send(pdu, target, null, listener);
>         }
>         catch (Exception e)
>         {
>             e.printStackTrace();
>         }
> 
> Best regards
> Marcin Kokoszka
> _______________________________________________
> SNMP4J mailing list
> SNMP4J at agentpp.org
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