Re: [Bluez-users] Issues with multiple (concurrent) rfcomm connections

[Marcel Holtmann <marcel@holtmann.org>]

Hi George,

> I just ran across an issue with setting up multiple rfcomm connections from a 
> linux laptop with kernel 2.4.28-mh1 using an Anycom USB-120 dongle with Silicon 
> Wave chipset.
> 
> I just tried to maintain 2 connections to 2 seperate commercial rs232 adapters 
> (roalan wcs 232) using the socket API (test source attached). While connection 
> setup is ok, and reconnects (e.g. after powerfail of peers) work too for a 
> single device, running the same procedure in parallel leads to a behavor where 
> no more sockets can be opened. It starts with a write failed to the socket (ok 
> so far), but the following connection attempts lead to errors 16 (resource or 
> device busy) and 11 (resource temp. unavailable) or 110 (timeout). From this 
> state, the system does not recover and all bluez modules have to be reloaded ;-(
> 
> as an alternative I tried the same thing using seperate processes instead of 
> threads or, using the rfcomm utility and cat for sending data. I always end up 
> with the same errors.
> 
> I wonder whether this problem is known, or related to Silicon Wave. Could 
> anyone try this with a CSR based system?

try to reproduce it with a 2.6.10-mh1 kernel.

Regards

Marcel




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