Help! Sending RFCOMM packet over L2CAP fails.

11 Nov 2005

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Greetings.

I've been working on an application, which builds an RFCOMM (OBEX)
packet directly on top of L2Cap. The initialization of  the connection
seems to go okay.

However, Writing, i.e. writeSync always fails. it returns
kIOReturnNotPrivileged. (0xe00002c1). Is L2Cap access somehow restricted,
to disallow direct creation of RFCOMM connections?

I ran the program as root. ( I sudo'ed the application, I sudo su'd, _then_
ran it - didn't help. )

Interestingly enough, SDP works fine built over L2Cap.

Another question:

The class IOBluetoothHCIController. Does any documentation exist of
that class? I'd very much like being able to access the HCI layer.

 Thanks,

 - Esa

Here's the relevant parts of the code:

Creating the connection:
---------------
  NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
  IOBluetoothDevice* blue_device = [super getDevice:target];
  if (blue_device == NULL) {
    if (debug) {
      printf("Unable to get the Bluetooth device\n");
    }
    [super connectionAttempt:false];
    [localPool release];
    return false;
  }
  if ([blue_device openConnection] != kIOReturnSuccess) {
    if (debug) {
      printf("Failed to open a connection to the bluetooth device.\n");
    }
    [super connectionAttempt:false];
    [localPool release];
    return false;
  }
  IOReturn ioret = [blue_device openL2CAPChannelSync:&l2capChannel
          withPSM:psm delegate:self];
  [l2capChannel retain];
  if (ioret != kIOReturnSuccess) {
    if (debug) {
      printf("Failed to open a L2CAP channel. \n");
    }
    [super connectionAttempt:false];
    [localPool release];
    return false;
  }

  [super connectionAttempt:true];
  [localPool release];

  return true;
}

---------------
Send:
---------------

- (bool)send:(char*)data len:(int)len
{
  IOReturn ioret;
  ioret = [l2capChannel writeSync:data length:len];
  if (ioret != kIOReturnSuccess) {
    if (debug){
      printf("RAWDEBUG: Write failed, ioret: 0x%x\n", ioret);
    }
    return false;
  }
  return true;
}

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Help! Sending RFCOMM packet over L2CAP fails.

Esa Karjalainen