[Bluez-users] Two simultanous connections

[Bluez-users] Two simultanous connections

[Pierre N]

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Hi,

I've been trying to setup ip net with 3 identical devices connected
simultanously over bluetooth. It works after a long
while of fiddling around. I had to go the hcitool route manually to set
the initial connections and then I could use dund no problem. My
question is: why can't I initiate a connection (hcitool cc) from a
device which is already connected?

--
Pierre

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Re: [Bluez-users] Two simultanous connections

[Marcel Holtmann]

Hi Pierre,

> I've been trying to setup ip net with 3 identical devices connected
> simultanously over bluetooth. It works after a long
> while of fiddling around. I had to go the hcitool route manually to set
> the initial connections and then I could use dund no problem. My
> question is: why can't I initiate a connection (hcitool cc) from a
> device which is already connected?

for some setups this depends on your Bluetooth chip. So what does
"hciconfig -a" show? But I am not sure about what kind of network you
are talking, because between two device there can be only _one_ ACL link
and this means you can only use "hcitool cc" once. Actually there is no
need for creating the ACL link manually with hcitool, because every
higher layer will create it on demand.

Regards

Marcel




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Re: [Bluez-users] Two simultanous connections

[Pierre N]

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hcitool -a shows "invalid option -- a".
This is the bluetooth chip of an iPaq 3970. It's running Familiar
stable, so it must be a pretty old bluez version. Don't know if it
helps...

Ok, I knew I had to give more details... I create links between 3 iPaqs.
I tried using higher layer protocols to do so. Never worked. I'm just
trying to do a TCP/IP network so I can run XML-RPC on top of it, ssh
etc...

That's all I need. I tried to use pan, never worked, I tried to use dun
over pan, never worked, I tried to use rfcomm never worked. Always the
same problem:
I could connect A to B and B to C, never B to A and C to A. 

Now I went the hcitool route. Created my own connections very very
easily. I connected B to A and C to A (A master). Ran dund _after_
hcitool connections and everything is running great.

hcitool con on A gives me two master connections. These connections have
been initialised from B and C as slave. So I can have two master
connections, but I can't create them from A. First one works, second one
doesn't, nothing happen. It's just out of curiosity.

--
Pierre



On Fri, 2004-04-02 at 20:10, Marcel Holtmann wrote:
> Hi Pierre,
> 
> > I've been trying to setup ip net with 3 identical devices connected
> > simultanously over bluetooth. It works after a long
> > while of fiddling around. I had to go the hcitool route manually to set
> > the initial connections and then I could use dund no problem. My
> > question is: why can't I initiate a connection (hcitool cc) from a
> > device which is already connected?
> 
> for some setups this depends on your Bluetooth chip. So what does
> "hciconfig -a" show? But I am not sure about what kind of network you
> are talking, because between two device there can be only _one_ ACL link
> and this means you can only use "hcitool cc" once. Actually there is no
> need for creating the ACL link manually with hcitool, because every
> higher layer will create it on demand.
> 
> Regards
> 
> Marcel
> 
> 

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Re: [Bluez-users] Two simultanous connections

[Marcel Holtmann]

Hi Pierre,

> hcitool -a shows "invalid option -- a".

who said that hcitool have an "-a" option.

> This is the bluetooth chip of an iPaq 3970. It's running Familiar
> stable, so it must be a pretty old bluez version. Don't know if it
> helps...

This uses HCI 11.2 firmware and this means that you are able to create
master of up to four slaves or slave of one master.

> Ok, I knew I had to give more details... I create links between 3 iPaqs.
> I tried using higher layer protocols to do so. Never worked. I'm just
> trying to do a TCP/IP network so I can run XML-RPC on top of it, ssh
> etc...
> 
> That's all I need. I tried to use pan, never worked, I tried to use dun
> over pan, never worked, I tried to use rfcomm never worked. Always the
> same problem:
> I could connect A to B and B to C, never B to A and C to A. 
> 
> Now I went the hcitool route. Created my own connections very very
> easily. I connected B to A and C to A (A master). Ran dund _after_
> hcitool connections and everything is running great.
> 
> hcitool con on A gives me two master connections. These connections have
> been initialised from B and C as slave. So I can have two master
> connections, but I can't create them from A. First one works, second one
> doesn't, nothing happen. It's just out of curiosity.

Actually I don't see your problem. Let one iPAQ be the master and the
other connect as slaves.

Regards

Marcel




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Re: [Bluez-users] Two simultanous connections

[Pierre N]

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On Sat, 2004-04-03 at 14:16, Marcel Holtmann wrote:
> Hi Pierre,
> 
> > hcitool -a shows "invalid option -- a".
> 
> who said that hcitool have an "-a" option.

Sorry, I mixed up hcitool and hciconfig...

> Actually I don't see your problem. Let one iPAQ be the master and the
> other connect as slaves.

Who said I had a problem? ;-p
This is all, as I said previously, out of curiosity...

Seriously, my question is why can a master hold up to 4 slaves but can't
initiate these 4 connections itself as a master?

Is it technically impossible, is it just an implementation constraint or
is there some secret switch to do so?

--
Pierre

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Re: [Bluez-users] Two simultanous connections

[Andreas Gaufer]

On Sat, 03 Apr 2004 15:01:46 +0200
Pierre N <pierren@mac.com> wrote:

> On Sat, 2004-04-03 at 14:16, Marcel Holtmann wrote:
> > Hi Pierre,
> > 
> > > hcitool -a shows "invalid option -- a".
> > 
> > who said that hcitool have an "-a" option.
> 
> Sorry, I mixed up hcitool and hciconfig...
> 
> > Actually I don't see your problem. Let one iPAQ be the master and the
> > other connect as slaves.
> 
> Who said I had a problem? ;-p
> This is all, as I said previously, out of curiosity...
> 
> Seriously, my question is why can a master hold up to 4 slaves but can't
> initiate these 4 connections itself as a master?
> 
> Is it technically impossible, is it just an implementation constraint or
> is there some secret switch to do so?
> 

check the role-switch procedure, its done with "hcitool" and its opention "sr". 
Both Sides have to support this feature.

Greetings

Andy



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Re: [Bluez-users] Two simultanous connections

[Pierre N]

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On Sat, 2004-04-03 at 18:23, Andreas Gaufer wrote:
> On Sat, 03 Apr 2004 15:01:46 +0200
> Pierre N <pierren@mac.com> wrote:
> 
> > Seriously, my question is why can a master hold up to 4 slaves but can't
> > initiate these 4 connections itself as a master?
> > 
> > Is it technically impossible, is it just an implementation constraint or
> > is there some secret switch to do so?
> > 
> 
> check the role-switch procedure, its done with "hcitool" and its opention "sr". 
> Both Sides have to support this feature.

I tried this already. I can initiate a connection from A, but whatever
the type of the connection (slave or master) I can't initialise another
one. So I can't switch role on the second connection. I can switch role
of the first one, works great, but I doesn't allow me to start a second
one. It always fail silently.

I noticed that if I connected as slave, a scan shows me the 3rd iPaq.
Connected as master, a scan comes back empty. But if B and C initialise
the connections as slave, then A hold two connections as master no
problem.

Well, looks like my curiosity doesn't inspire many...

--
Pierre 

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