Cannot send trap from my trapdaemon

I developed my own trap receiver programm called trapd based on snmptrapd.
For now it is only displaying received traps on screen in user friendly way.
So I know this app is working fine.
Now I want this app to send a trap/inform to different destination when
it receives any trap.
For testing purposes I created a function (with help of mib2c).
This function is invoked when my programm receives a trap:

int send_trap(void)
{
   netsnmp_variable_list *var_list = NULL;
   oid data_oid[] = { 1, 3, 6, 1, 4, 1, 16901, 0, 1 };
   oid ShortText_oid[] = { 1, 3, 6, 1, 4, 1, 16901, 4, 0 };

   char *data = "testing trap";
   u_long uptime = netsnmp_get_agent_uptime();

   snmp_varlist_add_variable(&var_list,
      snmptrap_oid,
      OID_LENGTH(snmptrap_oid),
      ASN_OBJECT_ID, (u_char*) data_oid, sizeof(data_oid));

   snmp_varlist_add_variable(&var_list,
      ShortText_oid,
      OID_LENGTH(ShortText_oid), ASN_OCTET_STR, (u_char *)data, strlen(data));


   send_v2trap(var_list);
   snmp_free_varbind(var_list);
   return SNMP_ERR_NOERROR;
}

Whe this func is run and I've this error:
send_trap: no v2 trapOID varbind provided

Could you tell me what's wrong with my function?

By the way: I use net-snmp 5.4 under Linux.
I didn't call init_send_trap() or domething similar.

Anyway: how to set trap destination and port within my trapd or this send_trap()?

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