Client

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Vector;
import javax.bluetooth.*;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class client extends MIDlet implements DiscoveryListener, CommandListener {

    Command sendCmd;
    Vector services = new Vector();
    Vector devices = new Vector();
    LocalDevice localdrive;
    DiscoveryAgent agent;
    String myServiceUUID = "2d26618601fb47c28d9f10b8ec891363";
    UUID MYSERVICEUUID_UUID = new UUID(myServiceUUID, false);
    UUID[] uuids = {MYSERVICEUUID_UUID};
    String connurl;
    StreamConnection SC;
    ServiceRecord service;
    String url;
    StreamConnection conn;
    DataOutputStream output;
    DataInputStream input;

    protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {
    }

    protected void pauseApp() {
    }

    protected void startApp() throws MIDletStateChangeException {
        Form f = new Form("Client");
        sendCmd = new Command("Send", Command.OK, 0);
        f.addCommand(sendCmd);
        f.setCommandListener(this);
        Display d = Display.getDisplay(this);
        d.setCurrent(f);

        try {
            localdrive = LocalDevice.getLocalDevice();
            agent = localdrive.getDiscoveryAgent();
            agent.startInquiry(DiscoveryAgent.GIAC, this);
        } catch (BluetoothStateException ex) {
            ex.printStackTrace();
        }


    }

    public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
        devices.addElement(btDevice);

    }

    public void inquiryCompleted(int discType) {
        try {
            RemoteDevice remote = (RemoteDevice) devices.elementAt(0);
            agent.searchServices(null, uuids, remote, this);
        } catch (BluetoothStateException ex) {
            ex.printStackTrace();
        }
    }

    public void serviceSearchCompleted(int transID, int respCode) {
        switch (respCode) {
            case SERVICE_SEARCH_COMPLETED:
                createConnection();

                break;
            case SERVICE_SEARCH_DEVICE_NOT_REACHABLE:
                System.out.println("service not reachable");
                break;
        }
    }

    public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
        service = servRecord[0];


    }

    private void createConnection() {
        try {
            url = service.getConnectionURL(
                    ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);
            conn = (StreamConnection) Connector.open(url);
            output = conn.openDataOutputStream();
            input = conn.openDataInputStream();
        } catch (Exception e) {
        }

    }

    public void commandAction(Command c, Displayable d) {
        if (c == sendCmd) {
            try {
                output.writeUTF("Hey server");
                String msg = input.readUTF();
                System.out.println(msg);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}//end class