Re: choosing a RFCOMMChannel channelID ?
Re: choosing a RFCOMMChannel channelID ?
- Subject: Re: choosing a RFCOMMChannel channelID ?
- From: Petteri Kamppuri <email@hidden>
- Date: Thu, 24 Jun 2004 16:00:03 +0300
On 24.6.2004, at 15:45, Aurilien Hugeli wrote:
How am i supposed to choose the channelID ? is it a manufacturer
document ? can i be sure the channel is available and not already in
use ? am i supposed to scan channelID until connection succeed ?
I think the correct channelID depends on the service you are going to
use on the Bluetooth device. I'm not sure of this.
This is what I use:
// Find the correct serviceRecord on the device, maybe itarete through
them all
IOBluetoothSDPServiceRecord *serviceRecord = [self
findCorrectServiceOnDevice:mainBTDevice];
if(serviceRecord == nil)
{
NSLog(@"ERROR Couldn't find right service for device '%@'",
[mainBTDevice getNameOrAddress]);
return;
}
IOReturn error = 0;
BluetoothRFCOMMChannelID channelID = -1;
// Correct service found, ask for the RFCOMM Channel ID
error = [serviceRecord getRFCOMMChannelID:&channelID];
if(error == kIOReturnSuccess)
{
// Great, we found the channel ID! Now we can use it.
[mainBTDevice openRFCOMMChannelSync:&modemConnectionChannel
withChannelID:channelID delegate:self];
}
Apple documentation is really poor an the subject, or i did not found
it !
I think Apple needs to clarify and extend Bluetooth documentation. Also
I'd like to see documents which actually tell how and why to use the
API calls and what implications they have. And what are all the
possible error codes and what should the program do when it gets a
certain error code from a method.
Despite of quite sparse documentation, I think that the Bluetooth API
itself is very well thought of and quite elegant. Async methods are
easy and handy to use. Thank you all at the Bluetooth Cocoa team! Maybe
we'll see at the WWDC.
--
Petteri Kamppuri
email@hidden
MK&C
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