Net-snmp-5.4.1: problem while coding acknowledgement for Inform-Request.

Hello list,

I am coding a manager with net-snmp-5.4.1

I have a problem to acknowledge an Inform-Request.

Here is the code in my session callback (taken from function
snmp_input() in snmptrapd_handlers.c):
-----------------------------------------------------
   switch (pdu->command)
   {
     case SNMP_MSG_TRAP:
     case SNMP_MSG_TRAP2:
       ...
       break;

     case SNMP_MSG_INFORM:
       {
         netsnmp_pdu *ackPdu = snmp_clone_pdu(pdu);
         ackPdu->command = SNMP_MSG_RESPONSE;
         ackPdu->errstat = 0;
         ackPdu->errindex = 0;

         int res = snmp_send(session, ackPdu);
         if ( res == 0 )
         {
           // ERROR
           int cliberr;
           int snmperr;
           char *errstr;
           snmp_error(session, &cliberr, &snmperr, &errstr);
           ...
           free(errstr);
           snmp_free_pdu(ackPdu);
         }
         else
         {
           ...
         }
       }
       break;
   ...
   }
-------------------------------------------------------
My manager receives correctly Inform-Request sent by snmpinform or any 
other tool.

But function snmp_send() returns 0, with both cliberr and snmperr set to 
0, and the Inform-Request sender does not receive any acknowledgement.


Did I make a mistake ?
How can I find the reason of snmp_send() error ?

Regards,

Alain GUENRO

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