RTOS/CC2640R2F: sdk 1.40 : notification/indication max-size remains 20 bytes, while read size can be increased to 251

Tool/software: TI-RTOS

Using simplelink_cc2640r2_sdk_1_40_00_45, and creating a read/indicate CHAR on a service, the indication size is limited to 20, while the read size is limited to 251.

Is it according to the BLE standard, or is this a known limitation of the SDK ver 1.40?

Is this fixed in simplelink_cc2640r2_sdk_1_50_00_71 or simplelink_cc2640r2_sdk_1_50_00_58?

See the implementation of gattServApp_SendNotiInd, and the lines in bold

 /*********************************************************************
 * @fn      gattServApp_SendNotiInd
 *
 * @brief   Send an ATT Notification/Indication.
 *
 * @param   connHandle - connection handle to use.
 * @param   cccValue - client characteristic configuration value.
 * @param   authenticated - whether an authenticated link is required.
 * @param   pAttr - pointer to attribute record.
 * @param   taskId - task to be notified of confirmation.
 * @param   pfnReadAttrCB - read callback function pointer.
 *
 * @return  Success or Failure
 */
static bStatus_t gattServApp_SendNotiInd( uint16 connHandle, uint8 cccValue,
                                          uint8 authenticated, gattAttribute_t *pAttr,
                                          uint8 taskId, pfnGATTReadAttrCB_t pfnReadAttrCB )
{
  attHandleValueNoti_t noti;
  uint16 len;
  bStatus_t status;

  // If the attribute value is longer than (ATT_MTU - 3) octets, then
  // only the first (ATT_MTU - 3) octets of this attributes value can
  // be sent in a notification.
  noti.pValue = (uint8 *)GATT_bm_alloc( connHandle, ATT_HANDLE_VALUE_NOTI,
                                        GATT_MAX_MTU, &len );
  if ( noti.pValue != NULL )
  {
    status = (*pfnReadAttrCB)( connHandle, pAttr, noti.pValue, &noti.len,
                               0, len, GATT_LOCAL_READ );
    if ( status == SUCCESS )
    {
      noti.handle = pAttr->handle;

      if ( cccValue & GATT_CLIENT_CFG_NOTIFY )
      {
        status = GATT_Notification( connHandle, &noti, authenticated );
      }
      else // GATT_CLIENT_CFG_INDICATE
      {
        status = GATT_Indication( connHandle, (attHandleValueInd_t *)&noti,
                                  authenticated, taskId );
      }
    }

    if ( status != SUCCESS )
    {
      GATT_bm_free( (gattMsg_t *)&noti, ATT_HANDLE_VALUE_NOTI );
    }
  }
  else
  {
    status = bleNoResources;
  }

  return ( status );
}