Using unsecure/unauthenticated RFCOMM
Using unsecure/unauthenticated RFCOMM
- Subject: Using unsecure/unauthenticated RFCOMM
- From: Alexei Czeskis <email@hidden>
- Date: Thu, 23 Feb 2012 10:09:09 -0800
Hello!
Does anyone have any experience using unsecure/unauthenticated RFCOMM
on OS X? I'm trying to do unsecure RFCOMM between two unpaired
bluetooth devices (one is a MacBook running 10.7.3, the other is an
Android phone running ICS). I seem to be able to open an
unauthenticated baseband connection, but not an unauthenticated RFCOMM
channel over an unauthenticated basebandconnection.
What's odd is that I am able to open an unauthenticated baseband
connection successfully, but when I try to open an RFCOMM channel over
that connection, the devices try to pair. Here is roughly what I'm
doing:
/*
* Before this part, I:
* 1. Create device from a BT address string
* 2. Perform an SDP query
* 3. Extract the SDP record by UUID, make sure the service name
matches my service
* (whine that getServiceRecordForUUID returns one record instead of a list)
* 4. Get the channel ID from SDP record
*/
// Try connecting to device
if( [device openConnection:nil
withPageTimeout:100000
authenticationRequired:false] != kIOReturnSuccess ) {
NSLog(@"Couldn't open unauthenticated baseband connection to
client device");
exit(3);
}
NSLog(@"\tOpened unauthenticated baseband connection successfully");
// Try opening an RFCOMM channel
IOBluetoothRFCOMMChannel *channel = nil;
IOReturn status;
if ( [device openRFCOMMChannelSync:&channel
withChannelID:channelID delegate:self] != kIOReturnSuccess) {
NSLog(@"Couldn't open RFCOMM channel");
[device closeConnection];
exit(8);
}
NSLog(@"\tOpened RFCOMM channel");
The above code fails at the openRFCOMMChannelSync() call.
I'm fairly certain that the other endpoint is doing what it's supposed
to be doing -- I've been able to created unauthenticated RFCOMM
channels to it using unbuntu without pairing the two devices.
Can anyone point me in the right direction? Thanks!
-Alexei
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