Re: Help! Sending RFCOMM packet over L2CAP fails.
Re: Help! Sending RFCOMM packet over L2CAP fails.
- Subject: Re: Help! Sending RFCOMM packet over L2CAP fails.
- From: Marco Pontil <email@hidden>
- Date: Fri, 11 Nov 2005 08:45:59 -0800
This happens because the Apple RFCOMM implementation matches
on the L2CAP channel with PSM 3 much before yours, and then makes
that L2CAP channel unavailable to anybody else (there can be only one
client).
I would recommend you to use the Apple OBEX implementation, aside
of the fact that it would workaround this specific issue it will save
you a
lot of work, it has really easy to use apis, and has been extensively
tested.
Should you decide to use your own obex, just build the connection over
the RFCOMM APIs instead than building your own RFCOMM stack.
... Marco
On Nov 11, 2005, at 3:54 AM, Esa Karjalainen wrote:
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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