[SNMP4J] SNMP setting traps

[unknown unknown]

Hello everyone,
I probably misunderstood something, but I simply couldn't  find out this.

I'm using snmp4j libraries for creating mns, and i got some needed
commands working(such as GET, GETNEXT),
I even can receive traps and process them. But most significant part
I'm still missing - setting traps.
Maybe I misunderstood something, but sending traps and setting them
isn't equal operations (in snmp4j libraries)?

What I mean is, with sample code from snmp4j libraries I'm performing
sending operation, and can't expect traps
from agent ? Am I correct?

//----Code ----
import org.snmp4j.PDUv1;
...
PDUv1 pdu = new PDUv1();
pdu.setType(PDU.V1TRAP);
pdu.setGenericTrap(PDUv1.COLDSTART);
...
snmp.send(pdu, target);
...
//----Code ----

So the question is then how to set the traps? net send them? or I'm
missing something?

Any feedback is very welcome.

Thank you in advance,

Sigitas