CC2640R2F: Enabling Notification in Simple Central?

Part Number: CC2640R2F

Hello, 

I am trying to enable notifications from my simple_central based program but I am having some issues. I have read many posts about it and see that it consists of three modifications:

1. Call GATT_DiscAllCharDescs to get handle of CCCD

2. Write 0x01 to CCCD handle to enable notification

3. Add ATT_HANDLE_VALUE_NOTI to event handler in main loop

I am trying to add the first part but it always returns 0x016 (blePending error). Below is my discovery function which I have modified to handle 128 bit uuids:

static void SimpleCentral_processGATTDiscEvent(gattMsgEvent_t *pMsg)
{
  if (discState == BLE_DISC_STATE_MTU)
  {
    // MTU size response received, discover simple service
    if (pMsg->method == ATT_EXCHANGE_MTU_RSP)
    {
      uint8_t uuid[ATT_UUID_SIZE] = {FANGRECEIVER_SERV_UUID};

      // Just in case we're using the default MTU size (23 octets)
      sprintf(displayBuff, "MTU Size: %d", ATT_MTU_SIZE);
      queueDisplayString(displayBuff);

      discState = BLE_DISC_STATE_SVC;

      // Discovery simple service
      VOID GATT_DiscPrimaryServiceByUUID(connHandle, uuid, ATT_UUID_SIZE,
                                         selfEntity);
    }
  }
  else if (discState == BLE_DISC_STATE_SVC)
  {
    // Service found, store handles
    if (pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP &&
        pMsg->msg.findByTypeValueRsp.numInfo > 0)
    {
      svcStartHdl = ATT_ATTR_HANDLE(pMsg->msg.findByTypeValueRsp.pHandlesInfo, 0);
      svcEndHdl = ATT_GRP_END_HANDLE(pMsg->msg.findByTypeValueRsp.pHandlesInfo, 0);
    }

    // If procedure complete
    if (((pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP) &&
         (pMsg->hdr.status == bleProcedureComplete))  ||
        (pMsg->method == ATT_ERROR_RSP))
    {
      if (svcStartHdl != 0)
      {

        discState = BLE_DISC_STATE_CHAR;

        //Discover All Characteristics
        status =  GATT_DiscAllChars(connHandle, svcStartHdl, svcEndHdl, selfEntity);

        sprintf(displayBuff, "Disconnections: %d", disconnections);
        queueDisplayString(displayBuff);

      }
    }
  }
  else if (discState == BLE_DISC_STATE_CHAR)
  {
    // Characteristic found, store handle
    if ((pMsg->method == ATT_READ_BY_TYPE_RSP) &&
        (pMsg->msg.readByTypeRsp.numPairs > 0))
    {

        uint16_t len = pMsg->msg.readByTypeRsp.len;
        uint8_t i;
        uint8_t j;
        uint8_t k = 0;
        uint8_t uuidChar[ATT_UUID_SIZE]= {0};

        uint8_t uuidChar1[ATT_UUID_SIZE] = {FANGRECEIVER_CHAR1_UUID};
        uint8_t uuidChar2[ATT_UUID_SIZE] = {FANGRECEIVER_CHAR2_UUID};
        uint8_t uuidChar3[ATT_UUID_SIZE] = {FANGRECEIVER_CHAR3_UUID};
//        uint8_t uuidChar4[ATT_UUID_SIZE] = {FANGRECEIVER_CHAR4_UUID};

        for(i=0; pMsg->msg.readByTypeRsp.numPairs > i; i++)
        {
            if(i==0)
                memcpy(uuidChar, uuidChar1, 17);
            if(i==1)
                memcpy(uuidChar, uuidChar2, 17);
            if(i==2)
                memcpy(uuidChar, uuidChar3, 17);
//            if(i==3)
//                memcpy(uuidChar, uuidChar4, 17);

            //check out uuid of char:
            for(j=0; j<=16; j++)
            {
                //start at 5 and go to 20 plus offset (i*len)
                if(pMsg->msg.readByTypeRsp.pDataList[(5+j)+(i*len)] == uuidChar[j])
                    k++;
            }

            if(k==16)
            {

                if(i==0)
                    char1Hdl =  pMsg->msg.readByTypeRsp.pDataList[3+(len*i)];
                if(i==1)
                    char2Hdl =  pMsg->msg.readByTypeRsp.pDataList[3+(len*i)];
                if(i==2)
                    char3Hdl =  pMsg->msg.readByTypeRsp.pDataList[3+(len*i)];
//                if(i==3)
//                    char4Hdl =  pMsg->msg.readByTypeRsp.pDataList[3+(len*i)];
            }
            k=0;

        }

        if(!char1Hdl||!char2Hdl||!char3Hdl)
            queueDisplayString("Char Dsc Error");


      queueDisplayString("Simple Svc Found");

      //Discover all characteristic descriptors
      //status =  GATT_DiscAllCharDescs(connHandle, svcStartHdl, svcEndHdl, selfEntity);

      procedureInProgress = FALSE;
    }

    discState = BLE_DISC_STATE_IDLE;
  }
}

Any guidance on where I should be calling the GATT_DiscAllCharDescs so I don't get a blePending error would be greatly appreciated. 

Thanks!