[Bluez-users] rfcomm - multiple connections to 1 pocketPC from 2 seperate bluetooth-dongles

[Bluez-users] rfcomm - multiple connections to 1 pocketPC from 2 seperate bluetooth-dongles

[Pieter De Mil]

Hello,

I'm using rfcomm 2.15 to make a connection from Linux to a 
PocketPc(00:04:3E:68:3C:6B). I can do this for one connection. But when I 
plug in a second bluetooth-dongle in my linuxPC, I can't establish a second 
rfcomm connection with the same PocketPc.

Scenario 1:
BT1 ------- PocketPC  : ok
channel0

Scenario 2:
BT2 ------- PocketPC   : ok
channel1

Scenario 3: not ok

channel0
BT1 ----------|
                       |
                    PocketPC
                       |
BT2 ----------|
channel1

Someone tried this?

Regards,
Pieter




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Re: [Bluez-users] rfcomm - multiple connections to 1 pocketPC from 2 seperate bluetooth-dongles

[Brad Midgley]

Pieter,

It may be that you need to force a role change from the ppc. Some radios 
can connect to multiple *slave* devices only. By default, the host 
initiating the connection is the master.

If that is it, how you make the role change happen is probably a 
question of how to do it from pocketpc.

Brad

Pieter De Mil wrote:
> Hello,
> 
> I'm using rfcomm 2.15 to make a connection from Linux to a 
> PocketPc(00:04:3E:68:3C:6B). I can do this for one connection. But when 
> I plug in a second bluetooth-dongle in my linuxPC, I can't establish a 
> second rfcomm connection with the same PocketPc.
> 
> Scenario 1:
> BT1 ------- PocketPC  : ok
> channel0
> 
> Scenario 2:
> BT2 ------- PocketPC   : ok
> channel1
> 
> Scenario 3: not ok
> 
> channel0
> BT1 ----------|
>                       |
>                    PocketPC
>                       |
> BT2 ----------|
> channel1
> 
> Someone tried this?
> 
> Regards,
> Pieter
> 
> 
> 
> 
> -------------------------------------------------------
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> Want to be the first software developer in space?
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Re: [Bluez-users] rfcomm - multiple connections to 1 pocketPC from 2 seperate bluetooth-dongles

[Marcel Holtmann]

Hi Pieter,

> I'm using rfcomm 2.15 to make a connection from Linux to a 
> PocketPc(00:04:3E:68:3C:6B). I can do this for one connection. But when I 
> plug in a second bluetooth-dongle in my linuxPC, I can't establish a second 
> rfcomm connection with the same PocketPc.
> 
> Scenario 1:
> BT1 ------- PocketPC  : ok
> channel0
> 
> Scenario 2:
> BT2 ------- PocketPC   : ok
> channel1
> 
> Scenario 3: not ok
> 
> channel0
> BT1 ----------|
>                        |
>                     PocketPC
>                        |
> BT2 ----------|
> channel1
> 
> Someone tried this?

first you need to separate the two rfcomm calls and tell them what
dongle should they use.

	rfcomm -i hci0 connect rfcomm0 <bdaddr> <channel>
	rfcomm -i hci1 connect rfcomm1 <bdaddr> <channel>

Now you may have the problem that the pocket PC is not capable of
dealing with scatternets (as Brad said) or you can't connect to the same
RFCOMM channel twice.

For the scatternet part you should check with "hcitool info" as root
what kind of chip is in that PocketPC. For the double channel problem,
there might be no choice if it does not offer two serial profiles. Of
course you can try to use the dialup profile instead or write your own
application that runs on the PocketPC and provides you with two RFCOMM
channels for your special use.

Regards

Marcel




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