I have a question about client/manager

Hi :
 
     I want to write a client/manager . I read the Simple Application code at the page : http://www.net-snmp.org/wiki/index.php/TUT:Simple_Application . when I write codes follow this page ,and run it . my monitor display is :
 
[root@localhost app]#
[root@localhost app]#
[root@localhost app]# ./snmpdemoapp
snmp open = 157139280
read objid 1  3  6 ...  = 1
send pdu   = 1
111111111111111
errstat = 00000000
No log handling enabled - turning on stderr logging
snmpget: Timeout
[root@localhost app]#

    And I can see that master-agent(process snmpd ) receive nothing message . So I think that if my pdu packet is wrong ? Have someone can help me ?Thank you ! 
 
                                                                           best wishs for you !
 
 
My code is in the below:
 
 

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>

 /* change the word "define" to "undef" to try the (insecure) SNMPv1 version */
 #define DEMO_USE_SNMP_VERSION_3
 
 #ifdef DEMO_USE_SNMP_VERSION_3
 //#include "net-snmp/transform_oids.h"
 const char *our_v3_passphrase = "The Net-SNMP Demo Password";
 #endif
 
 main()
{
       struct snmp_session session, *ss;
       struct snmp_pdu *pdu;
       struct snmp_pdu *response;
           
       oid anOID[MAX_OID_LEN];
       size_t anOID_len = MAX_OID_LEN;
   
      struct variable_list *vars;
      int status = 0;
     /*
      * Initialize the SNMP library
     */
      init_snmp("snmpapp");

      /*
      * Initialize a "session" that defines who we're going to talk to
      */
      snmp_sess_init( &session );                   /* set up defaults */
 //    printf("session initial = %d\n",status);   
 
     session.peername = "test.net-snmp.org";
   
     /* set up the authentication parameters for talking to the server */
   
     #ifdef DEMO_USE_SNMP_VERSION_3
   
     /* Use SNMPv3 to talk to the experimental server */
     
     /* set the SNMP version number */
     session.version=SNMP_VERSION_3;
        
     /* set the SNMPv3 user name */
     session.securityName = strdup("MD5User");
     session.securityNameLen = strlen(session.securityName);
   
     /* set the security level to authenticated, but not encrypted */
     session.securityLevel = SNMP_SEC_LEVEL_AUTHNOPRIV;
   
     /* set the authentication method to MD5 */
     session.securityAuthProto = usmHMACMD5AuthProtocol;
     session.securityAuthProtoLen = sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
     session.securityAuthKeyLen = USM_AUTH_KU_LEN;
    
     /* set the authentication key to a MD5 hashed version of our
        passphrase "The Net-SNMP Demo Password" (which must be at least 8
        characters long) */
     if (generate_Ku(session.securityAuthProto,
                   session.securityAuthProtoLen,
                   (u_char *) our_v3_passphrase, strlen(our_v3_passphrase),
                   session.securityAuthKey,
                   &session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
        // snmp_perror(argv[0]);
         snmp_log(LOG_ERR,
                "Error generating Ku from authentication pass phrase. \n");
         exit(1);
     }
   
     #else /* we'll use the insecure (but simplier) SNMPv1 */
   
     /* set the SNMP version number */
     session.version = SNMP_VERSION_1;
   
     /* set the SNMPv1 community name used for authentication */
     session.community = "demopublic";
     session.community_len = strlen(session.community);
   
     #endif /* SNMPv1 */

     /* windows32 specific initialization (is a noop on unix) */
     SOCK_STARTUP;
   
     /*
      * Open the session
      */
     ss = snmp_open(&session);                     /* establish the session */
     printf("snmp open = %d\n",ss);
 
       if (!ss) {
         snmp_perror("ack");
         snmp_log(LOG_ERR, "something horrible happened!!!\n");
         exit(2);
       }
    
     /*
      * Create the PDU for the data for our request.
      *   1) We're going to GET the system.sysDescr.0 node.
      */
     pdu = snmp_pdu_create(SNMP_MSG_GET);
 

      status = read_objid(".1.3.6.1.2.1.1.1.0", anOID, &anOID_len);
      printf("read objid 1  3  6 ...  = %d\n",status); 
   
//      #if OTHER_METHODS
  //    get_node("sysDescr.0", anOID, &anOID_len);
    //  read_objid("system.sysDescr.0", anOID, &anOID_len);
   //   #endif
 
      snmp_add_null_var(pdu, anOID, anOID_len);

      /*
       * Send the Request out.
       */
      status = snmp_synch_response(ss, pdu, &response);
      printf("send pdu   = %d\n",status); 
      if(response == NULL)
    printf("111111111111111\n");
 
      printf("errstat = %08x\n",response);
      /*
      * Process the response.
      */
      if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
       /*
        * SUCCESS: Print the result variables
        */

       for(vars = response->variables; vars; vars = vars->next_variable)
       print_variable(vars->name, vars->name_length, vars);
 
        /* manipuate the information ourselves */
        for(vars = response->variables; vars; vars = vars->next_variable) {
          int count=1;
          if (vars->type == ASN_OCTET_STR) {
            char *sp = (char *)malloc(1 + vars->val_len);
            memcpy(sp, vars->val.string, vars->val_len);
            sp[vars->val_len] = '\0';
            printf("value #%d is a string: %s\n", count++, sp);
            free(sp);
          }
           else
            printf("value #%d is NOT a string! Ack!\n", count++);
     }
     

      } else {
        /*
          * FAILURE: print what went wrong!
         */
    
        if (status == STAT_SUCCESS)
          fprintf(stderr, "Error in packet\nReason: %s\n",
               snmp_errstring(response->errstat));
        else
          snmp_sess_perror("snmpget", ss);
    
   }

      /*
       * Clean up:
       *  1) free the response.
       *  2) close the session.
       */
      if (response)
        snmp_free_pdu(response);
        snmp_close(ss);
    
       /* windows32 specific cleanup (is a noop on unix) */
      SOCK_CLEANUP;
   

}

 
 
 
 
 


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