Problem in Client-Server Application

[Kroeff]

I'm trying to create a simple client-server application but I'm having some problems.
I did the server's code, as follows, and after running it I try to connect to it by the BluetoothExplorer, which is in the demo/gui folder of the stack. The device was found, but when the BTExplorer tries to find the available services at that device, an exception happens: javax.bluetooth.BluetoothStateException: org.javabluetooth.stack.hci.HCIException: Create Connection failed. (17)
Does someone knows why is it happening?

This is the code:

import ...

public class BluetoothServer {
    private LocalDevice localDevice = null;
    private RemoteDevice remoteDevice = null;
    private BluetoothStack bluetoothStack = null;
    private DiscoveryAgent discoveryAgent = null;
    private L2CAPConnectionNotifier notifier = null;
    private boolean Active = true;
   
    public BluetoothServer(String Port, String Name, int RMTU, int TMTU, String Id) {
        try {
            StackInit(Port, Name, RMTU, TMTU, Id);
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        catch (HCIException e) {
            e.printStackTrace();
        }
        catch (PortInUseException e) {
            e.printStackTrace();
        }
    }

    private void StackInit(String portName, String connName, int RMTU, int TMTU, String Id) throws IOException, HCIException, BluetoothStateException, PortInUseException {
        StringBuffer str;
        // Starts Bluetooth Stack by serial port
        HCIDriver.init(new UARTTransport(portName));
        BluetoothStack.init(new BluetoothStackLocal());
        bluetoothStack = BluetoothStack.getBluetoothStack();
        bluetoothStack.send_HCI_HC_Change_Local_Name("BT SERVER");

        // Enable Inquiry, Page and also AutoInquiry
        bluetoothStack.send_HCI_HC_Write_Scan_Enable((byte)0x03);
        bluetoothStack.send_HCI_HC_Write_Event_Filter_Connection_Setup((byte)0x02);
        bluetoothStack.send_HCI_HC_Write_Event_Filter_Inquiry_Result();
       
        localDevice = LocalDevice.getLocalDevice();
        localDevice.setDiscoverable(DiscoveryAgent.GIAC);

        // Service's string
        str = new StringBuffer();
        str.append("btl2cap://localhost:");
        str.append(Id);
        str.append(";ReceiveMTU=");
        str.append(RMTU);
        str.append(";TransmitMTU=");
        str.append(TMTU);
        str.append(";authenticate=false;encrypt=false;name=");
        str.append(connName);
       
        // Register the service in the SDDB
        notifier = (L2CAPConnectionNotifier)Connector.open(str.toString());
       
        System.out.println("Local Name: " + localDevice.getFriendlyName());
        System.out.println("Waiting for clients...");
       
        // Wait for clients
        L2CAPConnection conn = notifier.acceptAndOpen();
       
        System.out.println("Woohoo!!!");
       
        // Close
        notifier.close();
    }
   
    public static void main(String[] args) {
        BluetoothServer srv = new BluetoothServer("COM1", "Server Service", 255, 255, "1122");
    }
}

Thanks.

[Kroeff]

The problem was solved!!!
Probably the Bluetooth Tool Kit I'm using (Teleca - http://www.comtec.sigma.se\) does not support Master/Slave switching. So, in the getL2CAPLink method of the HCIDriver class, when it calls send_HCI_LC_Create_Connection(...), I've changed the Allow_Role_Switch parameter (the last one) to 0x00 which means, according to BT Specification: "The local device will be a master, and will not accept a role switch
requested by the remote device at the connection setup."