hi, I'm not sure about the Apple implementation of Bluetooth, but at the baseband level of the protocol stack, the hardware divise the timeline into slots. These slots are grouped by packets of 6, which may be use differently depending of the quality of service. One normal use is: --- link 1 sends --- link 1 receives --- link 2 sends --- link 2 receives --- link 3 sends --- link 3 receives If Apple's implementation uses only one link for all the rfcomm channels, then there should be as much channels as you want, with a lower quality for a bigger number of channels. But if the implementation creates one link for each channel, then you are blocked at 3 channels. And the hardware may reserve one link for his own needs, which would block you at 2 channels. I hope it helps. luc bergevin, student. Okay, After redesigning my app to run a separate process for each BT device, I have a new problem. As each process starts, it attempts to set up and add a service. It then registers for incoming connections. Once connection is complete, the main process launches another sub-process which repeats the procedure. My first process launches and sets up channel 1. A device connects on channel 1. A new process is started which sets up channel 2. A device connects on channel 2. A new process is started which stes up channel 4. (What happened to channel 3?) I try to connect a third device, but to no avail. No notification ever gets called. The device can't connect. If I disconnect one of the first 2 devices, then the third device will successfully connect in on channel 4. So I'm wondering, is there a limit to the number of incoming channels I can set up? I was able to connect more than 2 incoming devices with my old, single process design. But that design only set up 1 channel. ...Thanx... ...Eric... _______________________________________________ bluetooth-dev mailing list | bluetooth-dev@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/bluetooth-dev Do not post admin requests to the list. They will be ignored.