Bluetooth client connection to 32feet.NET not working all the time

I am trying to connect to a bluetooth connection, but for some reason my client is not connecting.

More precisely, I get an exception when I try to connect to the stream: The connection attempt failed because the related party did not respond properly after a while or the connection failed because the connected host was unable to respond.

All the examples I found on the internet didn't actually solve my problem, and I'm currently not entirely sure where this problem comes from. Scanning and pairing are working fine - I can see that the corresponding bluetooth device is successfully paired.

I am trying to connect through the first client setup and then call connect

The name, address and contact name of the Bluetooth client are known:

    public bool SetClient(String clientName, String btAddress, String pin)
    {
        bool retVal = false;
        m_remoteBluetoothClient = new BluetoothDeviceInfo(BluetoothAddress.Parse(btAddress));
        m_localBluetoothClient.SetPin(pin);
        if (m_remoteBluetoothClient.Authenticated)
        {
            //m_localBluetoothClient.Authenticate = true;
            retVal = true;
        }
        else
        {
            if (BluetoothSecurity.PairRequest(m_remoteBluetoothClient.DeviceAddress, pin))
            {
                retVal = true;
            }
        }
        return retVal;
    }

      

        
        
        
      

    

Then an asynchronous connection:

    private void ClientConnectThread()
    {
        m_localBluetoothClient.BeginConnect(m_remoteBluetoothClient.DeviceAddress, BluetoothService.SerialPort, Connect, m_localBluetoothClient);
    }

    private void Connect(IAsyncResult result)
    {
        if (result.IsCompleted)
        {
            m_localBluetoothClient.EndConnect(result);
            mBtStream = m_localBluetoothClient.GetStream();
        }
    }

      

        
        
        
      

    

The locales m_localBluetoothEndpoint and m_localBluetoothClient are created this way, although the endpoint is more or less new (before I used BluetoothCLient without a parameter):

        m_localBluetoothEndpoint = new BluetoothEndPoint(BluetoothRadio.PrimaryRadio.LocalAddress, BluetoothService.SerialPort);
        m_localBluetoothClient = new BluetoothClient(m_localBluetoothEndpoint);

      

        
        
        
      

    

I also tried to work with the Listener in case remote devices want to connect, but the callback is never called:

    public void SetupListener()
    {
        var listener = new BluetoothListener(BluetoothService.SerialPort);
        listener.Start();
        listener.BeginAcceptBluetoothClient(this.BluetoothListenerAcceptClientCallbackTwo, listener);

    }

      

        
        
        
      

    

Can anyone tell me if there is something wrong with my connection and how can I figure out why I got the exception mentioned above?

The exception gets here:

    m_localBluetoothClient.EndConnect(result);

      

        
        
        
      

    

What I also don't understand is that the SupportedServices call to remoteCLient returned 0 commands - so the device didn't list any bluetooth services.

    m_remoteBluetoothClient.InstalledServices()

      

        
        
        
      

    

thank