Re: [Bluez-devel] L2CAP: One failing connection hurts others?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Stefan,

> I'm observing the following issue: I have 3 BT devices. 2 in listening 
> state, the 3rd is connecting to both of them repeatingly via L2CAP 
> (polling some data). If one of the listening devices is almost of the 
> range and makes connection attempts fail, this also causes the 
> connection attempts to the other device (which is good in range) to fail 
> with errno 16 "Device or ressource busy". The (almost) out of range 
> device fails as expected with errno 110 "Connection timed out" (since I 
> set a timeout) or 112 "Host is down".
> 
> Now my question: Is there a way to circumvent this errno 16, so that I 
> can further connect to in range devices even if one device is getting 
> out of range and thus producing errors? What makes L2CAP failing with 
> errno 16? How can I prevent it?

run "hcidump -x" as root and show us the problematic parts. What kind of
dongles are you using? Do you changed any of hcid.conf settings or do
you set the master/rswitch on the listening L2CAP socket?

Regards

Marcel




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