@Override
public void serviceSearchCompleted(int arg0, int arg1) {
    debugString("Service search completed.");

    for(int ii=0;ii<4;ii++){
    broadcastCommand(new String("Hello world!"));
    }
}

/**
 * Sends a message to all the devices. (using the service)
 *
 * @param str
 *      Byte array which represents a string.
 */
public void broadcastCommand(String str) {
    for(ServiceRecord sr : services) {
        String url = sr.getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);

        conn = null;

        try {
            debugString("Sending command to " + url);

            conn = (StreamConnection) Connector.open(url);
            dout = new DataOutputStream(conn.openOutputStream());

            dout.writeUTF(str);
            debugString(String.format("Sending %s", str));

            dout.flush();
            dout.close();
            conn.close();

            debugString("Sent. Connection Closed.");

        } catch (Exception e) {
            debugString("Failed to connect to " + url);
            e.printStackTrace();
        }
    }
}

javax.bluetooth.BluetoothConnectionException:
    at com.intel.bluetooth.BluetoothStackMicrosoft.connect(Native Method)
    at com.intel.bluetooth.BluetoothStackMicrosoft.access$700(BluetoothStackMicrosoft.java:44)
    at com.intel.bluetooth.BluetoothStackMicrosoft$ConnectThread.run(BluetoothStackMicrosoft.java:651)