snmp_set_var_typed_value with ASN_TIMETICKS problem

Hello,
  
  Could you help me with this problem?
  The subagent that has been built using mib2c.table_data.conf returns a wrong value.
  The explanations are in bold. Definitely something I am doing wrongly.
  
  int
  get_protocolDirLastChange(netsnmp_mib_handler *handler,
                             netsnmp_handler_registration *reginfo,
                             netsnmp_agent_request_info *reqinfo,
                             netsnmp_request_info *requests)
  {   
        u_char str_return[MAX_VAR_LEN+1];
        long returnVal = 123456;
        sprintf((char*)str_return,"%d",returnVal);
        int str_return_len = strlen((char*)str_return);
  
        switch (reqinfo->mode) {
        case MODE_GET:
  
      //when there is str_return_len IReasonning MIB  Browser gives error message: bad size for integer-like type (6)
  
      snmp_set_var_typed_value(requests->requestvb, ASN_TIMETICKS,
                                (u_char *)str_return,
                                str_return_len);
  
      //when there is str_return_len = 4 IReasonning MIB Browser gives a wrong value (no error message)
      //str_return_len = 4;
      //snmp_set_var_typed_value(requests->requestvb, ASN_TIMETICKS,
      //                            (u_char *)str_return, 
                                  str_return_len);
          break;
  
      default:
          return SNMP_ERR_GENERR;
      }
      return SNMP_ERR_NOERROR;
  }
  
   Thanks,
  
  Stan
  
  
		
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