SET Request impossible with snmpSET and netsnmp lib - c++

Question

i have an agent thanks to netsnmp library , its working fine for the Getrequest , I use MibIreasonning to do my test of get and set however I have a big problem for the set , when I do the snmp set i got no Response and the value dosent change , with command line i use :
snmpset -v2c -cprivate 127.0.0.1:10181 1.3.6.1.4.1.4045.61005681.20.2.3.0.0 i 1
and i got : Timeout: No Response from 127.0.0.1:10181
and If i do snmpset in public I got : Error in packet , Reason noAccess
Here is my code if you can please help me :
//-------------------------------------------------------------------------------------------------
// ValueOID
//-------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <iostream>
#include <string>
int handle_AgentSNMP15 (
netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests) {
int value=0 ;
switch (reqinfo->mode) {
case MODE_GET:
std::cout<<"GETSNMP15"<<std::endl;
std::cout<<"get value "<<*(requests->requestvb->val.integer)<<std::endl;
snmp_set_var_typed_value(
requests->requestvb,
ASN_INTEGER,
(u_char*)&value,
sizeof(value));
break;
case MODE_SET_RESERVE1:
std::cout<<*(requests->requestvb->val.integer)<<std::endl;
case MODE_SET_RESERVE2:
value = *(requests->requestvb->val.integer);
std::cout<<"RESERVE2"<<std::endl;
break;
case MODE_SET_FREE:
break;
case MODE_SET_ACTION:
std::cout<<"SETACTION"<<std::endl;
value = *(requests->requestvb->val.integer);
break;
case MODE_SET_COMMIT:
std::cout<<"SETCOMMIT"<<std::endl;
value = *(requests->requestvb->val.integer);
break;
case MODE_SET_UNDO:
break;
default:
{
snmp_log(
LOG_ERR,
"Unknown mode (%d) in handle_dot1dBaseType\n",
reqinfo->mode);
std::cout<<"ERROR OTHER THAN GET";
return SNMP_ERR_GENERR;
}
}
return SNMP_ERR_NOERROR;
}
void init_Value() {
static oid AgentSNMP15[]={1,3,6,1,4,1,4045,61005681,20,2,3,0};
netsnmp_register_scalar(netsnmp_create_handler_registration(
"agentSNMP15",
handle_AgentSNMP15,
AgentSNMP15,
OID_LENGTH(AgentSNMP15),
HANDLER_CAN_RWRITE));
}
Thanks for your help