CC2640R2F: What's the meaning of 'noti.handle = 0x1E'

Part Number:CC2640R2F

Hi,

I am developing a custom profile to transfer a big block of data.

I studied the demo of ble5 throughput. "noti.handle = 0x1E" is used for notification, the snippet below,

static void SimpleBLEPeripheral_blastData()
{
  // Subtract the total packet overhead of ATT and L2CAP layer from notification payload
  uint16_t len = MAX_PDU_SIZE-TOTAL_PACKET_OVERHEAD;
  attHandleValueNoti_t noti;
  bStatus_t status;
  noti.handle = 0x1E;
  noti.len = len;

  // Store hte connection handle for future reference
  uint16_t connectionHandle;
  GAPRole_GetParameter(GAPROLE_CONNHANDLE, &connectionHandle);

  while(throughputOn)
  {
    // If RTOS queue is not empty, process app message.
    // We need to process the app message here in the case of a keypress
    while (!Queue_empty(appMsgQueue))
    {
      sbpEvt_t *pMsg = (sbpEvt_t *)Util_dequeueMsg(appMsgQueue);
      if (pMsg)
      {
        // Process message.
        SimpleBLEPeripheral_processAppMsg(pMsg);

        // Free the space from the message.
        ICall_free(pMsg);
      }
    }

    noti.pValue = (uint8 *)GATT_bm_alloc( connectionHandle, ATT_HANDLE_VALUE_NOTI, GATT_MAX_MTU, &len );

    if ( noti.pValue != NULL ) //if allocated
    {

      // Place index
      noti.pValue[0] = (msg_counter >> 24) & 0xFF;
      noti.pValue[1] = (msg_counter >> 16) & 0xFF;
      noti.pValue[2] = (msg_counter >> 8) & 0xFF;
      noti.pValue[3] = msg_counter & 0xFF;

      // Attempt to send the notification w/ no authentication
      status = GATT_Notification( connectionHandle, &noti, 0);

1. Can you explain the meaning of 'noti.handle = 0x1E;' ? which service the handle '0x1E' is belong to?

2. It seems that '0x1E' is belong to a system service. Can I use the handle '0x1E' in my custom profile to transfer data?

Thanks!