ucd-snmp:why not send trap by send_v2trap()

Hi,I have a question.
In my snmpd agent, the trap2sink ip address will be changed sometimes,but in my embedded uClinux,the filesystem is read-only(romfs), so I can't change the trap2sink directive in file "snmpd.conf" which is in filesystem.
Now,I delete all lines of trap2sink in snmpd.conf, and use the ucd-snmp API functions to implement it,but by using API functions, I find the UDP trap packages can't be sent out.My source code as follows,which is produced be mib2c and is style of ucd-snmp. Is there any mistake for using the API functions? In my application,there will be ten destinatio ip addresses to receive traps,then how to implement this? 
.....#define SNMP_TRAP_PORT 162
#define SNMP_TRAP_COMMUNITY "public"
....oid scomcenter_variables_oid[] = { 1,3,6,1,4,1,19176 };....void init_scomcenter(void) {
 unsigned char trap_dest1[20] = "200.162.162.55";
 
  REGISTER_MIB("scomcenter", scomcenter_variables, variable7,
               scomcenter_variables_oid);  if(create_trap_session ((char *)trap_dest1, SNMP_TRAP_PORT,SNMP_TRAP_COMMUNITY,
             SNMP_VERSION_2c,SNMP_MSG_TRAP2) == 0)
      printf("create_trap_session 1 err\n");               
  snmp_alarm_register(5,     /* seconds */
                        SA_REPEAT,      /* repeat (every 30 seconds). */
                        check_encoder_statu,      /* our callback */
                        NULL    /* no callback data needed */
 
        );
              
}void check_encoder_statu()
{
 send_demo_trap();
 return;
}void send_demo_trap()
{
 char example_str[] = "no video source";
 long my_value = 0;
 
 
 oid     objid_snmptrap[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };
 size_t  objid_snmptrap_len = OID_LENGTH(objid_snmptrap);
  oid    notifying_oid[] = { 1, 3, 6, 1, 4, 1, 19176, 1, 1, 20, 0, 8 };
  oid    tsoveripstatus_oid[] = { 1, 3, 6, 1, 4, 1, 19176, 1, 1, 20, 1, 0, 0 };
 
  struct variable_list var_trap,var_obj;
  
  
            var_trap.next_variable = &var_obj;
            var_trap.name = objid_snmptrap; // snmpTrapOID.0
            var_trap.name_length = sizeof(objid_snmptrap)/sizeof(oid);
            var_trap.type = ASN_OBJECT_ID;
            var_trap.val.objid = notifying_oid; //
            var_trap.val_len = sizeof(notifying_oid);
 
            var_obj.next_variable = NULL;
            var_obj.name = tsoveripstatus_oid;
            var_obj.name_length = sizeof(tsoveripstatus_oid)/sizeof(oid);
            var_obj.type = ASN_INTEGER;
            var_obj.val.integer = &my_value;
            var_obj.val_len = sizeof(my_value);
            send_v2trap(&var_trap);}

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