A simple C program which sends v2c informs do not make retries in case of unavailable destination

Hello Everyone!

I have a question. I want to send SNMP v2c informs using C and net-snmp 
module in linux SLES 12.
To do this I created the following simple program where everything comes 
to send_trap_to_sess() function :

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
oid             objid_sysuptime[] = { 1, 3, 6, 1, 2, 1, 1, 3, 0 };
oid             objid_id[] = { 1,3,6,1,4,1,78945,1,1,2,4,0};
oid             objid_name[] = { 1,3,6,1,4,1,78945,1,1,2,1,0};
oid              trap_oid[] = {1,3,6,1,4,1,78945,1,1,1,1,1};
int main()
{
    netsnmp_session session, *ss;
    netsnmp_pdu    *pdu, *response;
    char *trap = NULL;

    char comm[] = "public";
    snmp_sess_init( &session );
    session.version = SNMP_VERSION_2c;
    session.community = comm;
    session.community_len = strlen(session.community);
    session.peername = "192.168.4.10:1234";
    session.retries = 3;
    session.timeout = 1000;
    ss = snmp_open(&session);
    if (!ss) {
      snmp_sess_perror("ack", &session);
      exit(1);
    }
    pdu = snmp_pdu_create(SNMP_MSG_INFORM);
    pdu->community = comm;
    pdu->community_len = strlen(comm);
    pdu->trap_type = SNMP_TRAP_ENTERPRISESPECIFIC;
    long sysuptime;
    char csysuptime [20];
    sysuptime = get_uptime ();
    sprintf (csysuptime, "%ld", sysuptime);
    trap = csysuptime;
    snmp_add_var (pdu, objid_sysuptime, sizeof (objid_sysuptime)/sizeof
(oid),'t', trap);
    snmp_add_var(pdu, trap_oid, OID_LENGTH(trap_oid), 'o', 
"1.3.6.1.4.1.78945.1.1.1.1.1");
    snmp_add_var(pdu, objid_name, OID_LENGTH(objid_name), 's', "Test Name"
);
    snmp_add_var(pdu, objid_id, OID_LENGTH(objid_id) , 'i', "5468");
    send_trap_to_sess (ss, pdu);
    snmp_close(ss);
    return (0);
}


Frankly speaking this is modified part of code taken from 
https://stackoverflow.com/questions/30050542/how-to-send-v2-traps-in-net-snmp-using-c 
 where a user asked how to send snmp v2c trap using C. 
Here I modified creation of pdu:
pdu = snmp_pdu_create(SNMP_MSG_INFORM);
and added assignments of retries and timeout values for informs
session.retries = 3;
session.timeout = 1000;

This example works quite well. I see that it sends inform request in 
wireshark output. But there is one problem: If the destination is not 
available it will not do any retries despite that this is an inform.

Could you please give me a suggestion what I do wrong here? 
Thank you in advance.

Best regards, 
Andrei Yahorau

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