Multiple devices

[Ritchie]

Hi,

I'm having a problem with connecting to multiple devices using
Bluecove 2.1.1 SNAPSHOT on a Windows 7 system. Below is some of my
code:

////////////////////////////////////////////////////////////////////////////

package Threading.TwoIMU;

import java.util.Vector;

import javax.bluetooth.BluetoothStateException;
import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.DiscoveryListener;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.RemoteDevice;
import javax.bluetooth.ServiceRecord;

public class BluetoothConnection implements DiscoveryListener {

// object used for waiting
private static Object lock;
// vector containing the devices discovered
private static Vector<RemoteDevice> vecDevices;

static public void getLocalHost() throws BluetoothStateException {

vecDevices = new Vector<RemoteDevice>();
lock = new Object();

// Create new instance of class.
BluetoothConnection client = new BluetoothConnection();

// Display local device address and name.
LocalDevice localDevice = LocalDevice.getLocalDevice();

// Find devices.
DiscoveryAgent agent = localDevice.getDiscoveryAgent();

// Start search for devices
agent.startInquiry(DiscoveryAgent.GIAC, client);

// Wait until search is complete.
try {
synchronized (lock) {
lock.wait();
}
} catch (InterruptedException e) {
e.printStackTrace();
}

}

public String getIMUURL(String IMUName) {

int index = 0;

// How many devices were found.
RemoteDevice[] count = new RemoteDevice[vecDevices.size()];

// Loop through devices looking for element containing IMU number/
name.
for (int i = 0; i < vecDevices.size(); i++) {
count[i] = vecDevices.elementAt(i);
if (count[i].toString().contains(IMUName)) {
index = i;
}
}

// Remote device created for device at saved element.
RemoteDevice remoteDevice = (RemoteDevice)
vecDevices.elementAt(index);
String connectionURL = ("btspp://" +
remoteDevice.getBluetoothAddress() + ":
1;authenticate=false;encrypt=false;master=false");

return connectionURL;

}

// methods of DiscoveryListener
public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod)
{
// add the device to the vector
if (!vecDevices.contains(btDevice)) {
vecDevices.addElement(btDevice);
}
}

// implement this method since services are not being discovered
public void servicesDiscovered(int transID, ServiceRecord[]
servRecord) {
if (servRecord != null && servRecord.length > 0) {

}
synchronized (lock) {
lock.notify();
}
}

// implement this method since services are not being discovered
public void serviceSearchCompleted(int transID, int respCode) {
synchronized (lock) {
lock.notify();
}
}

// Releases lock when search is complete.
public void inquiryCompleted(int discType) {
synchronized (lock) {
lock.notify();
}
}

}

////////////////////////////////////////////////////////////////////////////

In a main method I'm calling the getLocalHost method once, then
creating two threads where each tries to open a connection after they
obtain the URL for each of the devices from the getIMUURL method
above.

This URL is then passed into:
StreamConnection getStream = (StreamConnection) Connector.open(url);

But I believe that because I'm trying to connect to two devices at
exactly the same time (parallel) it's resulting in this error:

javax.bluetooth.BluetoothConnectionException: Failed to connect;
[10048] Only one usage of each socket address (protocol/network
address/port) is normally permitted.

What am I doing wrong? Creating one thread and connecting has no
problems, so it's just the concurrency which is resulting in problems.
I should also mention that one device connects, it's just the other
device that fails.