LAUNCHXL-CC2650: GAPROLE_ADVERT_OFF_TIME does not work, advertisement keeps running...

Hello, I an working on simple broadcaster example. 
After starting the broadcast, 
I want to turn off broadcasting automatically after 5 second.
So that I can turn it on later when needed. 
Thus power can be saved somewhat. 

I have used the code below. 
But the broadcast seems to be continuous. 
I can always pick it from my phone's BLE scanner.

What am I missing here?

uint8_t initial_advertising_enable = TRUE;

static uint8 advertData[ADV_MAX_LEN] =
{
  0x02,
  GAP_ADTYPE_FLAGS,
  GAP_ADTYPE_FLAGS_BREDR_NOT_SUPPORTED | GAP_ADTYPE_FLAGS_LIMITED,

  0x1B,   // length of this data including the data type byte      dec--27
  GAP_ADTYPE_MANUFACTURER_SPECIFIC,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00,
  0x00, 0x00
};   




within broadcaster init function...............

 uint16_t gapRole_AdvertOffTime = 5000;

    uint8_t advType = GAP_ADTYPE_ADV_SCAN_IND; // use scannable undirected adv

    GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t),
                         &initial_advertising_enable);

    GAPRole_SetParameter(GAPROLE_ADVERT_OFF_TIME, sizeof(uint16_t),
                         &gapRole_AdvertOffTime);

    GAPRole_SetParameter(GAPROLE_SCAN_RSP_DATA, sizeof (scanRspData),
                         scanRspData);
    GAPRole_SetParameter(GAPROLE_ADVERT_DATA, sizeof(advertData), advertData);

    GAPRole_SetParameter(GAPROLE_ADV_EVENT_TYPE, sizeof(uint8_t), &advType);
  }

  // Set advertising interval
  {
    uint16_t advInt = DEFAULT_ADVERTISING_INTERVAL; // set to 160 equivalent of (100 ms)

    GAP_SetParamValue(TGAP_LIM_DISC_ADV_INT_MIN, advInt);
    GAP_SetParamValue(TGAP_LIM_DISC_ADV_INT_MAX, advInt);
    GAP_SetParamValue(TGAP_GEN_DISC_ADV_INT_MIN, advInt);
    GAP_SetParamValue(TGAP_GEN_DISC_ADV_INT_MAX, advInt);
  }

  // Start the Device
  VOID GAPRole_StartDevice(&simpleBLEBroadcaster_BroadcasterCBs);