Bluetooth Low Energy StackOverflow on Windows

Question

I wanted to write a programm that is receiving data every 10ms over Bluetooth Low Energy. I get a lot of thinks to work, but i always have one problem and can´t find the source. Maybe you can help me.
Here is the basis of my Code written in C++Builder 10 on Windows 10.

> //---------------------------------------------------------------------------



#include <vcl.h>

#pragma hdrstop



#include "Unit1.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)



#define Characteristic_UUID "{6e400003-b5a3-f393-e0a9-e50e24dcca9e}"

#define Service_UUID        "{6e400001-b5a3-f393-e0a9-e50e24dcca9e}"

#pragma resource "*.dfm"







TForm1 *Form1;

TBluetoothLEDevice* device;

TBluetoothGattCharacteristicList* characteristic ;

//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)

    : TForm(Owner)

{

     BluetoothLE1->DiscoverDevices(100);

}

//---------------------------------------------------------------------------

void __fastcall TForm1::BluetoothLE1EndDiscoverDevices(TObject * const Sender, TBluetoothLEDeviceList * const ADeviceList)



{

             device = ADeviceList->First();



    BluetoothLE1->DiscoverServices(device);

}

//---------------------------------------------------------------------------

void __fastcall TForm1::BluetoothLE1ServicesDiscovered(TObject * const Sender, TBluetoothGattServiceList * const AServiceList)



{



           GUID AGuid;

    CLSIDFromString(TEXT(Service_UUID), &AGuid);

    TBluetoothGattService* service = BluetoothLE1->GetService(device,AGuid);

    //TBluetoothGattServiceList* abcd = BluetoothLE1->GetServices(device);





    CLSIDFromString(TEXT(Characteristic_UUID), &AGuid);

    characteristic = BluetoothLE1->GetCharacteristics(service);

    while(characteristic->First()->UUID != AGuid)

    {

           characteristic->Delete(0);



    }

    if(characteristic->First()!= NULL);

        BluetoothLE1->SubscribeToCharacteristic(device,characteristic->First());

}

//---------------------------------------------------------------------------

void __fastcall TForm1::BluetoothLE1CharacteristicRead(TObject * const Sender, TBluetoothGattCharacteristic * const ACharacteristic,

          TBluetoothGattStatus AGattStatus)



{

    static long i;



    Label1->Caption = i;

    i++;

}

//---------------------------------------------------------------------------

After exact 86303 Notifys (calling BluetoothLE1CharacteristicRead) i get a Stack Overflow. So there must be something wrong.
At the beginning i wrote the programm in Visual Studio in C++ with the Windows Drivers Functions, but same thing.

Answer 1

I have found the problem. It is a bug in the Win32 Bluetooth APIs. With Windows Update KB3156421 every program crashes after one notification and Mircosoft gives a workaround. Link

That workaround fixes my problem above too.

Bluetooth Low Energy StackOverflow on Windows

Sign up