SNMPV3 connectivity

Hi All,
I am trying to make an application to connect to my agent using snmpv3, but I am not able to connect it through.
I actually says that I am connected but is not able to get any variable from the agent, can anybody help in this ?

Here is the code which I am using

   init_snmp("snmpMgr");

    /*
     * Initialize a "session" that defines who we're going to talk to
     */
    snmp_sess_init( &m_session );                   /* set up defaults */

    m_session.peername = strdup(m_agentIp.c_str());

    /* set the SNMP version number
    m_session.version = SNMP_VERSION_2c;

    m_session.community = (u_char*)m_readCommunity.c_str();
    m_session.community_len = strlen((const char*)m_session.community);

      Open the session
     */
    fprintf(stderr, "*******connectioning to %s *****\n", m_agentIp.c_str());

    m_session.version = SNMP_VERSION_3;
    m_session.securityName = "admin";
    m_session.securityNameLen = 5;
    m_session.securityAuthProto = usmHMACMD5AuthProtocol;
    m_session.securityAuthProtoLen = sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
    m_session.securityAuthKeyLen = USM_AUTH_KU_LEN;

    m_session.securityAuthProtoLen = USM_AUTH_PROTO_MD5_LEN;

    m_session.securityPrivProto = usmDESPrivProtocol;
    m_session.securityPrivProtoLen =  sizeof(usmDESPrivProtocol)/sizeof(oid);
    m_session.securityPrivProtoLen = USM_PRIV_PROTO_DES_LEN;
    m_session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;


    m_session.securityAuthKeyLen = USM_AUTH_KU_LEN;

    if (generate_Ku(m_session.securityAuthProto,
             m_session.securityAuthProtoLen,
             (u_char *) "12345678", 8,
             m_session.securityAuthKey,
             &m_session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
             fprintf(stderr,
                   "Error generating a key (Ku) from the supplied authentication pass phrase. \n");
            return (-2);
    }

    m_session.securityPrivKeyLen = USM_PRIV_KU_LEN;

    if (generate_Ku(m_session.securityPrivProto,
            m_session.securityPrivProtoLen,
            (u_char *) "87654321", 8,
             m_session.securityPrivKey,
             &m_session.securityPrivKeyLen) != SNMPERR_SUCCESS) {
             fprintf(stderr,
                   "Error generating a key (Ku) from the supplied privacy pass phrase. \n");
             return (-2);
    }
    SOCK_STARTUP;

    m_sessPtr = snmp_open(&m_session);                     /* establish the session */

    fprintf(stderr, "\n *******session opened ******\n");

    if (!m_sessPtr) {
      snmp_sess_perror("ack", &m_session);
      fprintf(stderr, "\n*******Error in connection Reason: ******\n");

      SOCK_CLEANUP;
      return 1;
    }
    return 0;



Regards
-tarun

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