Bluetooth Read VI error - simple bluetooth client/server
Hello,
I've been able to run both the simple and advanced bluetooth LV examples, but I can't make the simple code below to work between my laptop and my PDA. Connection is established, but the Bluetooth Read VI returns an empty string.
Thanks in advance for any ideas.
Server
Client
Hello,
Take a look at the link below, it has a lot of information about using bluetooth within LabVIEW.
http://digital.ni.com/public.nsf/allkb/921795DD63E315B686256DD60082B252?OpenDocument
Thanks.
Best Regards
Luciano Borges
R&D Engineer
Pirelli Brazil
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Hello All, need help again.
I am trying to create a Client server program, where, the Client first sends a file to Server, on accepting the file, the server generates another file(probably xml), send it to the client as a response, the client read the response xml, parse it and display some data. now I am successful sending the file to the server, but could not figure out how the server can create and send a xml file and send it to the client as response, please help. below are my codes for client and server
Client side
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
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import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
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String host = "127.0.0.1";
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//===========================================================
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try
InetAddress adressen = InetAddress.getByName(host);
try
System.out.println("Establishing Socket Connection");
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Socket s = new Socket(adressen, port);
System.out.println("Socket is clear and available.....");
// OutputStream to socket
out = new BufferedOutputStream(s.getOutputStream());
byte[] buffer = new byte[1024];
int numRead;
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while( (numRead = fileIn.read(buffer)) >= 0)
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out.close();
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fileIn.close();
}catch (IOException e)
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System.err.println(e);
//===========================================================
//Retrieve data from Socket.
//BufferedReader in = new BufferedReader(new InputStreamReader(toServer.getInputStream()));
DataInputStream in = new DataInputStream(new BufferedInputStream(toServer.getInputStream()));
//String fromServer;
//Read from the server and prints.
//Receive text from server
FileWriter fr = null;
String frn = "xxx_response.xml";
try {
fr = new FileWriter(frn);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
try{
String line = in.readUTF(); //.readLine();
System.out.println("Text received :" + line);
fr.write(line);
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System.out.println("Read failed");
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in.close();
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public class XMLSocketS
public static void main(String[] args) throws IOException
//Establish a connection to socket
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
Socket clientLink = null;
while (true)
try
clientLink = serverSocket.accept();
System.out.println("Server accepts");
BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
byte[] buff = new byte[1024];
int readMe;
while( (readMe = inn.read(buff)) >= 0)
{ //reads from input stream, writes the file to disk
ut.write(buff, 0, readMe);
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clientLink.close();
// close InputStream
inn.close();
// flush
ut.flush();
// close OutputStream
ut.close();
//Sending response to client
//============================================================
//============================================================
System.out.println("File received");
}catch(IOException ex)
{System.out.println("Exception.");}
finally
try
if (clientLink != null) clientLink.close();
}catch(IOException e) {}
clientLink.close();
//serverSocket.close();
}SERVER
import java.net.*;
import java.io.*;
public class XMLSocketS
public static void main(String[] args) throws IOException
//Establish a connection to socket
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4545);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
Socket clientLink = null;
try
clientLink = serverSocket.accept();
System.out.println("Server accepts the client request.....");
BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
byte[] buff = new byte[1024];
int readMe;
while( (readMe = inn.read(buff)) >= 0)
{ //reads from input stream, writes the file to disk
ut.write(buff, 0, readMe);
ut.flush();
//Sending response to client
//============================================================
BufferedInputStream ftoC = null;
BufferedOutputStream outtoC = null;
// File to be send over the socket.
File file = new File("c:/xampp/htdocs/thesis/user_registration_response.xml");
try
// InputStream to read the file
ftoC = new BufferedInputStream(new FileInputStream(file));
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// OutputStream to socket
outtoC = new BufferedOutputStream(clientLink.getOutputStream());
byte[] buffer = new byte[1024];
int noRead;
//Checking if bytes available to read to the buffer.
while( (noRead = ftoC.read(buffer)) >= 0)
// Writes bytes to Output Stream from 0 to total number of bytes
outtoC.write(buffer, 0, noRead);
outtoC.flush();
//============================================================
System.out.println("File received");
}catch(IOException ex)
{System.out.println("Exception.");}
finally
try
if (clientLink != null) clientLink.close();
}catch(IOException e) {}
clientLink.close();
//serverSocket.close();
}CLIENT SIDE
import java.io.*;
import java.net.*;
public class XMLSocketC
@SuppressWarnings("deprecation")
public static void main(String[] args)
// Server: "localhost" here. And port to connect is 4545.
String host = "127.0.0.1";
int port = 4545;
BufferedInputStream fileIn = null;
BufferedOutputStream out = null;
// File to be send over the socket.
File file = new File("c:/xampp/htdocs/thesis/sensorList.xml");
try
// InputStream to read the file
fileIn = new BufferedInputStream(new FileInputStream(file));
}catch(IOException eee)
{System.out.println("Problem");}
try
System.out.println("Establishing Socket Connection");
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Socket clientSocket = new Socket(host, port);
System.out.println("Socket is clear and available.....");
// OutputStream to socket
out = new BufferedOutputStream(clientSocket.getOutputStream());
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int numRead;
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while( (numRead = fileIn.read(buffer)) >= 0)
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//=======================================
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outf.newLine();//write a new line to the file (for better format)
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// close OutputStream
out.close();
// close InputStrean
fileIn.close();
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{System.out.println("Exception.");}
Could you please point where am I doing the stupid mistake, client to server is working properly, but the opposite direction is not.
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Code:
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.SocketConnection;
import javax.microedition.io.StreamConnection;
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import javax.microedition.lcdui.StringItem;
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implements CommandListener, Runnable {
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private Form displayForm;
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private TextField serverPort;
private StringItem messageLabel;
private StringItem errorLabel;
private Command okCommand;
private Command exitCommand;
private Command backCommand;
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protected void destroyApp(boolean unconditional)
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OutputStream os = null;
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AlertType.ERROR);
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display.setCurrent(alert, addressForm);
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try {
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int count = is.read(buf, total, MAX_LENGTH - total);
if (count < 0)
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total += count;
is.close();
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messageLabel.setText(reply);
socket.close();
display.setCurrent(displayForm);
} catch (IOException ex) {
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null, AlertType.ERROR);
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} finally {
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if (is != null) {
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} catch (IOException ex1) {
try {
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os.close();
os = null;
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socket.close();
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I was wondering if someone found a solution to this..I would really appreciate it if u could post one...Thanks a lot..Cheerz -
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The server does bind() and accept(), the client does connect(). After that, the connection is symmetrical: either end can issue any number of read() and write() calls in any order. You write() to a socket, it pops out from read() at the other end (though not necessarily as a single packet; TCP/IP is stream oriented, so write() "packets" can and will be glued together, or fragmented at the whimsy of network routers and friends.)
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Go to Solution.Hi
http://zone.ni.com/devzone/cda/epd/p/id/2739 Here you can download that component.But you can also use TCP icons which is available in Data Commmunications>Protocals>TCp for communication and to read and write data use variant to flattened string. I have attached a small example where i will transfer a constant string to the host PC to check the link between client and the server. Hope this helps you.
Attachments:
TCP Comm.zip 47 KB -
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Hi i used the simple bluetooth client server example in labview 7.1. Iam getting an error saying your system does not support the network operation. I have following doubts also.
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Hii all,
I am developing bluetooth application using labview bluetooth vis.
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If Yes , in such case
1) What will be my client and what will be the server? as I intend to use client/server VIs provided in labview example finder . What is the exact difference between client and server in bluetooth domain?
2) Can I run both the VIs on same PC?
3) Simple Client VI uses "Bluetooth Open connection" VI ...so which address do I need to provide there ..is it PC's bluetooth address or Nokia's bluetooth address?
4) Simple Server VI uses "Create Listener" VI who asks for UUID...which UUID needs to be provided..is it PC's or Mobile's bluetooth?
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Best RegardsIn looking at some of the documentation, it appears that the driver required for using Bluetooth with LabVIEW is very specific. You need to have the Microsoft Bluetooth driver - not the driver that comes with the Bluetooth device. Also try lowing your security settings, or removing them.
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Bluetooth Tutorial
Brian R.
District Sales Manager
Washington DC
National Instruments -
Client server stuff - but simple -Duke $10 offered
Hi folks
I want to count # of times a method in server is called by the client.
In the server code I put a count and in each method implementation I increment count.
I am getting following errors for the count ..
CalculatorImpl.java:44: cannot resolve symbol
symbol : variable count
location: class CalculatorImpl
count++;
^
PLEASE HELP ME>>>>>
---------------here's the code -----------
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
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extends UnicastRemoteObject
implements Calculator
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new CalculatorImpl ().go ();
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3) How do they track the use of a method in the remote object ?
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Bluetooth : Blueman dbus error
Hello dear archers,
I am facing a problem trying to setup bluetooth at my desktop pc. It is a USB Bluetooth donge.
I followed http://wiki.archlinux.org/index.php/Bluetooth but i cannot launch blueman-manager.
I get the following error :
Connection to BlueZ failed
Bluez daemon is not running, blueman-manager cannot continue.
Further in the wiki i tried
[razor@RAZPC-LIN ~]$ hcitool scan
Scanning ...
00:25:BC:65:D3:75 anna petraki's iMac
00:22:98:1E:E1:C7 1 mouni stin axladia
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dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name org.bluez was not provided by any .service files
I have installed all the python packages for bluetooth ( dbus-python pygobject python-pybluez )
Do you have any idea what is going wrong?oh yes, sorry forgot to mention, both of them are started. here is my /etc/conf.d/bluetooth
[razor@RAZPC-LIN ~]$ cat /etc/conf.d/bluetooth
# Bluetooth configuraton file
# Bluetooth services (allowed values are "true" and "false")
# Run the bluetoothd daemon (default: true)
#DAEMON_ENABLE="false"
# Run hid2hci (default: false)
HID2HCI_ENABLE="true"
# Run the sdp daemon (default: false)
# If this is disabled, hcid's internal sdp daemon will be used
SDPD_ENABLE="true"
# Run the bluetooth HID daemon (default: false)
HIDD_ENABLE="true"
# Activate rfcomm ports (default: false)
RFCOMM_ENABLE="true"
# Run bluetooth dial-up networking daemon (default: false)
#DUND_ENABLE="true"
# Run bluetooth PAN daemon (default: false)
#PAND_ENABLE="true"
# rfcomm configuration file (default: /etc/bluetooth/rfcomm.conf)
RFCOMM_CONFIG="/etc/bluetooth/rfcomm.conf"
# Options for hidd, dund and pand (default: none)
#HIDD_OPTIONS=""
#DUND_OPTIONS=""
#PAND_OPTIONS=""
HAL and other services like Avahi which require dbus work as expected. Does this .service file lie anywhere so i can check if it exists or it is created dynamically uppon bluetooth daemon startup?
Thanks for your reply.
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