[Bluez-users] Problem with RFCOMM socket

[Bluez-users] Problem with RFCOMM socket

[jm]

Hello all,

I am trying to connect BlueZ with JSR-82 with RFCOMM sockets. The BlueZ 
server creates a socket server and the JSR-82 MIDlet connects to it.

It all goes well until the server sends some data and closes the socket. 
The JSR-82 program launches a "java.io.IOException: Stream closed or 
disconnected" when trying to get the number of bytes available from the 
stream. The problem can be solved by having the server call sleep(10) 
before calling close(clientSocket), giving some time for the client to 
fetch the data, but obviously it is a bad solution.

This is the code:

Server, C:

    status = write( clientSocket, message, messageSize );
  
    sleep(10); //Comment this for an error

    close(clientSocket);

Client, Java:

    try
    {
           while ( inputStream.available() == 0)
           {
                Thread.sleep(100);
                notifyUser("Waiting for data...");
           }
    }
    catch(IOException ex)
    {
           notifyUser(ex.getMessage());
    }

Rest of the code is not relevant in my opinion, but I can post it if 
someone needs it to find a solution. However, it is pretty simple and 
based in http://people.csail.mit.edu/albert/bluez-intro/x502.html and 
http://developers.sun.com/mobility/midp/articles/bluetooth2/

Is there something I am missing about RFCOMM sockets? Is it JSR-82 
related? Is it a bug?

Thanks

jm

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Re: [Bluez-users] Problem with RFCOMM socket

[Manuel Naranjo]

I don't think it's a bug at all, if the status of write tells you that
the data has all ready beeing streamed, then the problem is on the
midlet side. Take into account that given the frequency bluetooth
works there's a little delay between you send the data, and the data
is received by your peer, for most applications you will not notice,
but you might for this.

What you can do is making the midlet side to close the connection, and
not regard on the bluez side. Or make the midlet send some control
stuff back to bluez so your C code closes the rfcomm after the other
peer received your data.


> Hello all,
>
> I am trying to connect BlueZ with JSR-82 with RFCOMM sockets. The BlueZ
> server creates a socket server and the JSR-82 MIDlet connects to it.
>
> It all goes well until the server sends some data and closes the socket.
> The JSR-82 program launches a "java.io.IOException: Stream closed or
> disconnected" when trying to get the number of bytes available from the
> stream. The problem can be solved by having the server call sleep(10)
> before calling close(clientSocket), giving some time for the client to
> fetch the data, but obviously it is a bad solution.
>
> This is the code:
>
> Server, C:
>
>     status = write( clientSocket, message, messageSize );
>
>     sleep(10); //Comment this for an error
>
>     close(clientSocket);
>
> Client, Java:
>
>     try
>     {
>            while ( inputStream.available() == 0)
>            {
>                 Thread.sleep(100);
>                 notifyUser("Waiting for data...");
>            }
>     }
>     catch(IOException ex)
>     {
>            notifyUser(ex.getMessage());
>     }
>
> Rest of the code is not relevant in my opinion, but I can post it if
> someone needs it to find a solution. However, it is pretty simple and
> based in http://people.csail.mit.edu/albert/bluez-intro/x502.html and
> http://developers.sun.com/mobility/midp/articles/bluetooth2/
>
> Is there something I am missing about RFCOMM sockets? Is it JSR-82
> related? Is it a bug?
>
> Thanks
>
> jm
>
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> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
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>


-- 
Naranjo, Manuel Francisco

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