[SNMP4J] How to perform OctetString values from Windows SNMP trap variable bindings

[Anton Boronnikov]

I configured snmp agent in my Windows XP. Then I generate some events  
leading to sending a trap.
So I catch this traps. There are some variable bindings with oids such as  
"1.3.6.1.4.1.311.1.13.1.9999.1.0". I did not find any mib file describing  
this oids. And it seems that there is no such mib.
The problem is how to perform this variable values. As I can not get mib  
symbol I can not obtain variable syntax. If I have no syntax I don't know  
how to convert variable value.
Variable values are OctetString objects. And the first value is event  
description string (on Russian language, because my Windows XP is Russian)  
encoded to OctetString. I could do this:
byte[] bytes = ((OctetString) var).toByteArray();
String decodedValue = new String(bytes);
But. I can not do this for each variable value contained in trap. What if  
it is an IP Address? Or Mac address? Or something else that I should  
decode simply as var.toString() ?
Did somebody face my problem? How to perform Windows snmp trap variable  
OctetString value if we don't know anything about its oid?

-- 
At your service.
Anton Boronnikov