I am new to android. I am just trying to connect my Android device to PC and pass a string to PC using Bluetooth. I have no idea on how to do it. Android side I read about the Bluetooth API. Please suggest me some ways to do it. Thanks in advance.
For Android, my code is slightly different from yours:
BluetoothSocket socket = Device.createRfcommSocketToServiceRecord(device_UUID);
socket.connect();
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
dos.writeChar('x'); // for example
socket.close();
I used DataOutputStream to send data to PC. But surely this doesn't matter, just for your reference.
For PC,
LocalDevice localDevice = LocalDevice.getLocalDevice();
localDevice.setDiscoverable(DiscoveryAgent.GIAC); // Advertising the service
String url = "btspp://localhost:" + device_UUID + ";name=BlueToothServer";
StreamConnectionNotifier server = (StreamConnectionNotifier) Connector.open(url);
StreamConnection connection = server.acceptAndOpen(); // Wait until client connects
//=== At this point, two devices should be connected ===//
DataInputStream dis = connection.openDataInputStream();
char c;
while (true) {
c = dis.readChar();
if (c == 'x')
break;
}
connection.close();
I am not sure if the above codes still work today, as this was done 2 years ago. The BlueCove API may have changed a lot. But anyway, these codes work for me. Hope this may help you.
One more note is that, I had to uninstall the Toshiba Bluetooth Driver in my PC and reinstall the Microsoft one in order to make use of BlueCove. Otherwise, it won't work. (However, latest version of BlueCove may have already supported different drivers, please correct me if I said anything wrong.)
(Author: Victor Wong)
For clarification: on the PC side, you usually have a bluetooth device that comes with a virtual COM port. For testing purposes, you can use any terminal program (e.g. http://realterm.sourceforge.net/). When you start it on your virtual bluetooth serial port and connect your Android device, it will show the received data.
Related
i'm developing a small example about socket connection between android and ios (via wifi), after trying, the connection hasn't been established. Here is what I have done so far, I created a server on ios (used Bonjour to publish the service). I also created a client on android. However, after starting the server on ios, I also got the log:
ServerSocketConnection[3487:c07] Bonjour Service Published: domain(local.) type(_serversocket._tcp.) name(Macmini) port(54065)
Which means the server starting ok.
To the client part(android), I created the client through Socket class, some few lines of code:
Socket s = new Socket("local.", 54065);
OutputStream out = s.getOutputStream();
PrintWriter output = new PrintWriter(out);
output.println("Hello Android!");
BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
String st = input.readLine();
Putting it into AsyncTask to execute. However, I got the UnknowHostException:
08-06 12:45:44.460: W/System.err(873): java.net.UnknownHostException: Unable to resolve host "local.": No address associated with hostname
I'm a newbie to this kind of problem so any ideas what the problem is? I know it's related to the "host" thing but need the way to fix it.
*Note: I run 2 apps on 2 simulators (ios and android) as the same wifi network and same MAC, maybe this is the problem? any help would be appreciated and sorry for my English, it's not my native one.
Use the actual IP address of the iPhone instead of 'local.'.
On Android you can find a phone's IP via Settings -> WiFi -> Advanced. Not sure if iPhone offers the same option.
ps. Also be sure to have the internet permission in your manifest;
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
I am new to android and is trying to develop an application. I have a local server that has the address like http://abc:9070/
i.e: the server is running only on port number 9070 in my laptop.
Now i want to debug my program using a android device and i have to make sure that the android device listens to port number 9070, So that i can make the post http request call to the url and fetch some information.
Can someone tell me how can i make my device to listen to port number 9070?
Also can someone tell me whether changing default port number of adb solve this.
I have tried a lot to search for a solution. But i am not able to come up with any good answers.
Thanks in advance.
Nobody has expressed an opinion yet. May be the question is not clear, at least I found it very difficult to understand what you are trying to do.
You say you have a server (laptop) listening on port 9070 and you want a device to connect to this server thru this port? Is that right?
Have you try, from your device, launch the navigator and connect to that address? http://abc:9070
Anyway, the java code to make a socket connection is something similar to this:
try
{
Socket clientSocket = new Socket("YOUR_LAPTOP_IP", 9070);
// 1024 is an arbitrary number, could be 512, 65535, etc
byte[] buffer = new byte[1024];
int ret=0;
while ((ret=clientSocket.getInputStream().read(buffer)) > 0)
{
// from now on it's up to you what to do with the data you read
}
clientSocket.close();
}
catch (Exception e)
{
e.printStackTrace();
}
So im working around with bluetooth and trying to figure out how to send two strings via a bluetooth connection. From one android device to another.
I found this guide http://developer.android.com/guide/topics/connectivity/bluetooth.html
but it talks alot about setting up the connection. So i went straight down to the chapter about Managing a Connection. The reason i do this is that in the apps i create i plan to setup the bluetooth connection before opening the apps (via the phones usual bluetooth setup) and then open the apps and send when it is necessary.
So my question is how do i find the bluetooth socket that should be setup? Since that should be what im searching for to create the sending and recieving threads?
Hope this is enough information, else tell what more you need and ill try and answer to the best of my ability.
Best Regards Drakthal
The usual bluetooth setup only pairs between devices, it doesn't create a data connection between them (And even if it would, you wouldn't be able to access this Socket object because it's not created in your process).
After Bluetooth is turned on, you can call BluetoothAdapter.getBondedDevices() to get a set of the paired devices. You can then iterate over them, and initiate a connection to the one you want. You can't avoid the connection creation :( If you want a simplified example, you can look here (An answer I posted a while ago, regarding the whole pairing/connecting/sending/receiving subject with bluetooth).
Once you acquired an open connection, sending the 2 string is easy.
String s1 = "A", s2 = "B";
byte[] buf1 = s1.getBytes(), buf2 = s2.getBytes();
OutputStream os = connection.getOutputStream();
os.write(buf1);
os.write(buf2);
os.flush();
connection.close();
I use this code
luugiathuy.com/2011/02/android-java-bluetooth/
The server side is the PC
the client is the device, with the app based on bluetooth chat example
The device (galaxy tab 7.0) can establish connection with the PC.
However the PC server (written in java and bluecove) did nothing, as nothing is connected.
The loop for trying to find connected device is
while(true) {
try {
System.out.println("waiting for connection...");
connection = notifier.acceptAndOpen();
Thread processThread = new Thread(new ProcessConnectionThread(connection));
processThread.start();
} catch (Exception e) {
e.printStackTrace();
return;
}
Output on PC:
uuid: 0000110100001000800000805f9b34fb
waiting for connection...
EDIT: source downloadhttps://github.com/luugiathuy/Remote-Bluetooth-Android
Same issue I got when I was trying in linux. But the reason (still not sure) when you run the bluetooth android application without turning on the Java server using bluecove, It will try to connect with the already installed bluetooth software. You may see the bluetooth icon asking for granting access to the mobile device.
To solve this, I just changed the uuid in the server and application (say from 1103 to 1101 and vice versa) and then started the server first and then the android application. Java server part started listening.
The reason I think may be the uuid when it did not found the bluecove stack service server, it got connected to the device server listening on same uuid. So after changing the uuid and making sure that the server is running before launching the android application should solve the issue.
If you are getting connected to the bluetooth system application and not to the Java bluecove server,
1) First change the uuid both server and android application.
2) Second make sure your server is running and listening on same uuid.
3) Launch the android application which try to communicate on same rfcomm connection uuid.
Server part code I took from : http://www.jsr82.com/jsr-82-sample-spp-server-and-client/
Library : http://code.google.com/p/bluecove/downloads/list
Yes, it happens with me too, I suggest you to fire following commend on shell, when it shows waiting for connection.
hcitool cc 58:C3:8B:D7:FA:F4
here 58:C3:8B:D7:FA:F4 is my device's bluetooth address, which should be replaced by your device's bluetooth address.
To get your device's bluetooth address, just start bluetooth in your device with discoverable mode and execute hcitool scan command, it will display all the active device with their name and bluetooth address.
Well you may run the above hcitool cc 58:C3:8B:D7:FA:F4 command via Java code as follows,
try
{
Process p=Runtime.getRuntime().exec("hcitool cc 58:C3:8B:D7:FA:F4");
}
catch ( Exception e )
{
}
The output from your program says it listens on UUID 0x1101. Is that true? The sample you reference shows it listening on a different UUID. Its Service Class Id is 0x04c6093b and is set as follows:
34 UUID uuid = new UUID(80087355); // "04c6093b-0000-1000-8000-00805f9b34fb"
35 String url = "btspp://localhost:" + uuid.toString() + ";name=RemoteBluetooth";
36 notifier = (StreamConnectionNotifier)Connector.open(url);
The two need to match on client and server.
Hey I'm relatively new to Android programming (but not programming in general).
The Setup:
HTC Wildfire (running Android 2.1)
LM058 (RS232 Serial Cable Replacement)
LM058 will later on be attached to a MCU but for now it's connected to my laptop (terminal)
The Goal:
To connect Wildfire to LM058 to each other with a 'bidirectional-stream' (like: "Hello from Android", response: "Hey from LM058").
So far:
I've managed to connect the two devices (paired), I can tell by the LEDs on the LM058.
Problem:
I can't seem to send anything from my Wildfire to LM058, and can't write anything back. They are paired and Connected.
Code example:
String message = "Hello message from client to server.";
byte[] msgBuffer = message.getBytes();
try {
outStream.write(msgBuffer);
Log.e(TAG, "App was here!");
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Exception during write.", e);
}
I have previously made a similar connection using a Windows Mobile succesfully, but Android seems to give me some trouble at this point.
If you can help me get passed this small hurdle I would be very gratefull!
Could it have anything to do with BaudRate, because when a link is established (paired and Connected) it should replace the two devices (as a simple RS232 cable), so my Terminal on the PC should be set to a certain BaudRate (since I can't seem to find Baud Rate in Android). But still I can't see anything, if Baudrate was wrong then I would be able to see something (even though it might be rubbish) or?
There isn't Baudrate for Bluetooth connection, only you have to configure the baudrate between your BT-RS232 device and your computer...
For the BluetoothConnection you could see the next example:
http://developer.android.com/resources/samples/BluetoothChat/index.html
or this:
http://developer.android.com/guide/topics/wireless/bluetooth.html