[SNMP4J] how should I modify this program using SNMP4J

[Frank Fock]

Hello,

If your program should be able to receive the trap it sends,
then you will have to rethink your code towards chronology
(and multi-threading).

You did not specify any port to listen for SNMP requests/traps
by setting a transport-mapping with a port != 0. So it cannot
receive any trap. Try using the

http://www.snmp4j.org/doc/org/snmp4j/Snmp.html#addNotificationListener(org.snmp4j.smi.Address,
org.snmp4j.CommandResponder)

method to add a trap listener port and transport mapping
combination. This is a convenience method.

Hope this helps.

Best regards,
Frank

guogang wrote:
>  
> Hello,
> I am writing a SNMP trap receiver to do the following:
> 1.  send a trap
> 2.  receive it
> I have written a programa:
> ---------------------------------------------------------------------------------------
> public class testd implements CommandResponder, PDUFactory { 
>  
>     private Address address = new UdpAddress("127.0.0.1/162");          
>     private OID oid = new OID("1.3.6.1.2.1.1");                  
>     private CommunityTarget target = null;   
>     private OctetString community = new OctetString("public");        
>     public testd()
>       {
>         target = new CommunityTarget();         
>       }
>     
>     public static void main(String[] args) {
>         try {
>             testd snmp_ = new testd();
>             PDU response = snmp_.send();      
>  
>         } catch (Exception e) {
>            System.out.println("ERROR");
>             e.printStackTrace();
>         }
>     }
>
>     public PDU send() throws IOException {                              
>         Snmp snmp = new Snmp(new DefaultUdpTransportMapping());      
>  
>         target.setCommunity(new OctetString("public"));    　
>         target.setVersion(SnmpConstants.version1);                target.setAddress(address);
>         target.setRetries(2);
>         target.setTimeout(1000);
>                    
>         snmp.listen();                                                
>  
>         PDUv1 request = new PDUv1();        
>         request.setType(PDU.V1TRAP);                              
>         request.setGenericTrap(PDUv1.COLDSTART);
>         request.add(new VariableBinding(SnmpConstants.sysDescr,new OctetString("You System Description")));
>         snmp.trap(request,target);    
>               
>   CommandResponder trapPrinter = new CommandResponder()
>     {
>         public /*synchronized*/ void processPdu(CommandResponderEvent e) {
>         PDU command = e.getPDU();
>         if (command != null) 
>           {
>            System.out.println("success");
>             System.out.println(command.toString());
>           }
>         else 
>           {System.out.println("NULL ");}
>           }
>      };
>       snmp.addCommandResponder(trapPrinter);     
>                
>                
>       System.out.println(request);    
>  
>       snmp.close();
>       return request;
>       }
>     
>     public void processPdu(CommandResponderEvent event) {
>     }                                              
>     
>     public PDU createPDU(Target target) {
>         PDU aa = null;
>         System.out.println("display");
>         aa.add(new VariableBinding(SnmpConstants.sysDescr,new OctetString("You System Description")));
>         return aa ;                               
>     }
> }
> ---------------------------------------------------------------------------------------
>  
> but it can't receive SNMP traps,.
> Could anyone guide me as for how I should do?
> Thanks,
> Hust.gg
>  
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