Re: [Bluez-devel] Rfcomm is not buffering received data?

[Manuel Naranjo <manuel@aircable.net>]

Hello guys,

I've been able to fix this, by switching the tty node to raw mode. But
still something is not working well, select returns 0 even though
there's data in the buffer.

Here's the fix if anyone wants to know:
    int fd = fileno(data->fd);
   
    struct termios tio;
   
    tcgetattr(fd, &tio);

    tcflush(fd, TCIOFLUSH);
   
    tio.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
    tio.c_iflag &= ~(BRKINT | ICRNL | ISTRIP | IXON);
    tio.c_cflag &= ~(CSIZE | PARENB);
    tio.c_cflag |= CS8;
    tio.c_oflag &= ~(OPOST);

    cfmakeraw(&tio);
   
    tio.c_cc[VMIN] = 0;
    tio.c_cc[VTIME] = 0;

I think we should add a comment about this in the wiki, what do you think?

Cheers,
Manuel
> Hello everyone,
>
> I'm working on a dbus version of obexftp [1]. My goal was to remove all
> the calls to hci-lib and replace those for the dbus equivalent. It
> wasn't a though task, but now I'm facing a huge problem.
>
> It took me almost 5 hours to detect the problem, firstly I thought that
> the phone wasn't replying the request, but then after a brilliant idea I
> probed that the phone was replying because hcidump was showing that. My
> first conclusion was: "someone else is reading /dev/rfcomm# and erasing
> the buffer before I can read it"
>
> Then I checked with fuser which PIDs where using that file. For my
> surprise there where two PIDs, one was my program the other was the
> serial port service from BlueZ. I enabled gdb and did step debugging
> until I faced the first write function, and then I kill the serial port
> service PID. But I wasn't lucky at all, someone was still reading the
> rfcomm.
>
> Well after a couple of hours of thinking I cammed to the conclusion that
> some how the rfcomm device is not buffering the data it receives. I'm
> sure that the rfcomm buffer is not been overflowed, as the first reply
> from the phone is not more than 30 bytes long. I'm gonna start going
> through the rfcomm kernel sources, but if someone knows what's going on
> please let me know.
>
> I'm working on an Open Source Proximity Marketing Solution, and this is
> the last thing I need to finish before doing the official announcement
> (Marcel do you mind if I send a mail to the list saying this?)
>
> Thanks,
> Manuel
>
> [1] http://code.google.com/p/proximitymarketing/
>
>
>
>   


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