[Bluez-devel] pand vs. rfcomm

[Bluez-devel] pand vs. rfcomm

[Williams, Richard]

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Hello,

I have rfcomm working among a few small embedded devices for transferring small amounts of data - less than 100 bytes of data per second. I have a master and four slaves in a small piconet. 

Now I'm adding a higher bandwidth connection between my master and another device with pand. The master is an embedded xScale single board computer Linux 2.4.26 with the latest patches. The other device here is an iPAQ 5550 with built in bluetooth - running Familiar Linux. A single bnep connection is established OK and seems to work pretty well. If I establish a bnep connection, I can do all the usual TCP/IP stuff between the two - ping, telnet, ftp work just fine. But I'm wondering if the bnep connection interferes with the rfcomm's that are used in the piconet. Can I have multiple asynchronous processes using bnep and rfcomm without interfering with each other ? 

Here's what happens:
- I start up my system and the four rfcomm's are bound and transferring data. I've had this running for hours with no problems.

- Then I start the pand and this establishes the bnep connection OK. I can ping, ftp, etc.

- After a few minutes, the bnep connection fails to transmit any more data.

Is this to be expected ? 


thanks, and best regards,

Rich Williams



Richard B. Williams
Vitronics, Inc.
An MTC Technologies Company
3 Corbett Way
Eatontown, NJ 07724-2262
732-389-0244 x29
Richard.Williams@vitronics.com


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Re: [Bluez-devel] pand vs. rfcomm

[Marcel Holtmann]

Hi Richard,

> I have rfcomm working among a few small embedded devices for
> transferring small amounts of data - less than 100 bytes of data per
> second. I have a master and four slaves in a small piconet. 
> 
> Now I'm adding a higher bandwidth connection between my master and
> another device with pand. The master is an embedded xScale single
> board computer Linux 2.4.26 with the latest patches. The other device
> here is an iPAQ 5550 with built in bluetooth - running Familiar Linux.
> A single bnep connection is established OK and seems to work pretty
> well. If I establish a bnep connection, I can do all the usual TCP/IP
> stuff between the two - ping, telnet, ftp work just fine. But I'm
> wondering if the bnep connection interferes with the rfcomm's that are
> used in the piconet. Can I have multiple asynchronous processes using
> bnep and rfcomm without interfering with each other ? 
> 
> Here's what happens:
> - I start up my system and the four rfcomm's are bound and
> transferring data. I've had this running for hours with no problems.
> 
> - Then I start the pand and this establishes the bnep connection OK. I
> can ping, ftp, etc.
> 
> - After a few minutes, the bnep connection fails to transmit any more
> data.
> 
> Is this to be expected ? 

maybe there is a bug somewhere. Are you using my latest -mh patch? Have
you tried to include the small checksum fix from David?

Regards

Marcel




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