[Bluez-devel] What happens with bluetooth when connection is interrupted

[Bluez-devel] What happens with bluetooth when connection is interrupted

[Reto Bachmann]

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Hi to all,

I have a little question. I have to develop an Application where it can
happen that the connection interrupts. I poll the adapter every second to
see if I am still connected to the specific device. Now I have to know if
there is a possibility that the bluez-function "isConnected(string address)"
(D-Bus-Function) returns false but the connection itself is recovered by the
BT-Stack so the connection would still exist.

Kind regards,
Reto

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Re: [Bluez-devel] What happens with bluetooth when connection is interrupted

[rakesh agarwal]

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Hi to all,

Can anyone post a sample program for bonding with bluetooth device in C
language.

Regards,
Rakesh


On Thu, Sep 18, 2008 at 3:12 PM, Reto Bachmann <reto.bachmann@gmail.com>wrote:

> Hi to all,
>
> I have a little question. I have to develop an Application where it can
> happen that the connection interrupts. I poll the adapter every second to
> see if I am still connected to the specific device. Now I have to know if
> there is a possibility that the bluez-function "isConnected(string address)"
> (D-Bus-Function) returns false but the connection itself is recovered by the
> BT-Stack so the connection would still exist.
>
> Kind regards,
> Reto
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
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> prizes
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> _______________________________________________
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> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>
>

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Re: [Bluez-devel] What happens with bluetooth when connection is interrupted

[Marcel Holtmann]

Hi Reto,

> I have a little question. I have to develop an Application where it
> can happen that the connection interrupts. I poll the adapter every
> second to see if I am still connected to the specific device. Now I
> have to know if there is a possibility that the bluez-function
> "isConnected(string address)" (D-Bus-Function) returns false but the
> connection itself is recovered by the BT-Stack so the connection would
> still exist.

whatever you do don't poll for a status. You will get a D-Bus signal if
you are connected or paired etc. Check how bluez-gnome is doing it.

Regards

Marcel



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Re: [Bluez-devel] What happens with bluetooth when connection is interrupted

[Reto Bachmann]

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Hi Marcel,


whatever you do don't poll for a status. You will get a D-Bus signal if
> you are connected or paired etc. Check how bluez-gnome is doing it.


So I need to connect the D-Bus signal RemoteDeviceDisconnected to find out
that I am not connected anymore?

Why shouldn't I poll for a status? Is it just because a signal is sent
either way or is the status i ask for not the true status?

Regards,

Reto


>
>
> Regards
>
> Marcel
>
>
>
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Re: [Bluez-devel] What happens with bluetooth when connection is interrupted

[Patryk Zawadzki]

On Fri, Sep 19, 2008 at 8:56 AM, Reto Bachmann <reto.bachmann@gmail.com> wrote:
> So I need to connect the D-Bus signal RemoteDeviceDisconnected to find out
> that I am not connected anymore?
>
> Why shouldn't I poll for a status? Is it just because a signal is sent
> either way or is the status i ask for not the true status?

Because polling is the worst strategy both CPU- and power-wise. It
causes frequent wakeups that waste power and prevent CPUs from
entering a deep idle state. They also generate unnecessary traffic for
the IPC mechanism so if every program decided to poll for something
once a second, services like DBus would likely get hosed.

-- 
Patryk Zawadzki

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Re: [Bluez-devel] What happens with bluetooth when connection is interrupted

[Reto Bachmann]

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Hi Patryk,

i see the problems and I will change it. I now made some tests and i found
out that the library waits for a specific time until it sends the signal. I
suppose that in this time it tries to repair the connection.

Is it possible to manage this time period with compiling flags or something?

Thanks,
Reto

2008/9/19 Patryk Zawadzki <patrys@pld-linux.org>

> On Fri, Sep 19, 2008 at 8:56 AM, Reto Bachmann <reto.bachmann@gmail.com>
> wrote:
> > So I need to connect the D-Bus signal RemoteDeviceDisconnected to find
> out
> > that I am not connected anymore?
> >
> > Why shouldn't I poll for a status? Is it just because a signal is sent
> > either way or is the status i ask for not the true status?
>
> Because polling is the worst strategy both CPU- and power-wise. It
> causes frequent wakeups that waste power and prevent CPUs from
> entering a deep idle state. They also generate unnecessary traffic for
> the IPC mechanism so if every program decided to poll for something
> once a second, services like DBus would likely get hosed.
>
> --
> Patryk Zawadzki
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
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> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>

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