NET-SNMP -> C program in localhost ?

Hello,

I'm discovering SNMP C programmation and I've developped the following program, 
with the help of NET-SNMP tutorial. It's almost the same code as tuto's code, 
but which is running in localhost (or 127.0.0.1). It doesn't work, but the 
tuto's application works fine !

When I compile and run the application, but instead of having an object value 
(like a STRING or INTEGER), it displays : 

.1702326096.1952796274.1112100141.1886730810.1935753843.1968137065.1953853556.1952543827.841905013.0.990059265.36.3.4294966456


PowerNet-MIB::upsBasicOutputStatus.0 = Wrong Type (should be INTEGER): NULL
PowerNet-MIB::upsBasicOutputStatus.2 = Wrong Type (should be INTEGER): NULL

I tried so many solutions, but nothing I found can fix this "wrong type" error. 
I understand the whole code (each of its line), but I can't find the reason that 
make it doesn't work. I guess it comes from SNMP in general (or NET-SNMP), but 
I'm newbie with this protocol, so I really don't know.

My goal is just to display the value of an object from a personal MIB ("home 
made"), but for now I'm working with tools from tutorial ().

Have you any idea ?

thanks to everyone.

----------------------------------
C Code :: with "localhost" parameter


#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <string.h>
int main(int argc, char ** argv)
{
      struct snmp_session session;
      struct snmp_session *sess_handle;
      struct snmp_pdu *pdu;
      struct snmp_pdu *response;
      struct variable_list *vars;
      oid id_oid[MAX_OID_LEN];
      oid serial_oid[MAX_OID_LEN];
      size_t id_len = MAX_OID_LEN;
      size_t serial_len = MAX_OID_LEN;
      int status;
      struct tree * mib_tree;
      
      /*********************/
      init_mib();
      if(argv[1] == NULL){
 printf("Please supply a hostname\n");
 exit(1);
      }
      
      init_snmp("test_PowerNet");
      
      snmp_sess_init( &session );
      session.version = SNMP_VERSION_1;
      session.community = "public";
      session.community_len = strlen(session.community);
      session.peername = argv[1];
      sess_handle = snmp_open(&session);
      
      add_mibdir(".");
      mib_tree = read_mib("NET-SNMP-TUTORIAL-MIB.txt");
      pdu = snmp_pdu_create(SNMP_MSG_GET);
      
      read_objid("NET-SNMP-TUTORIAL-MIB::nstAgentModuleObject.0", id_oid, 
&id_len);
      snmp_add_null_var(pdu, id_oid, id_len);
      read_objid("NET-SNMP-TUTORIAL-MIB::nstAgentModuleObject.0", serial_oid, 
&serial_len);
      snmp_add_null_var(pdu, serial_oid, serial_len);
      
      print_objid("NET-SNMP-TUTORIAL-MIB::nstAgentModuleObject.0",id_len);
      /**
      *returns : 
     
 .1702326096.1952796274.1112100141.1886730810.1935753843.1968137065.1953853556.1952543827.841905013.0.990059265.36.3.4294966464

      **/
      status = snmp_synch_response(sess_handle, pdu, &response);
      for(vars = response->variables; vars; vars = vars->next_variable){
 print_variable(vars->name, vars->name_length, vars);
      }
      
      snmp_free_pdu(response);
      snmp_close(sess_handle);
      
      return (0);
}

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