[Bluez-devel] Help with l2cap broadcast programming

[Bluez-devel] Help with l2cap broadcast programming

[Marcos P]

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Hello

I would like to ask for some help with broadcast with l2cap. I am designing
a video server with bluetooth.

I have been successful in implementing a H263 video server, which is able to
stream video when is contacted by the clients; the server is able to send
unicast video to each client requesting the video. This was easy to
implement by following the examples provided the guided in how to program
bluetooth by Albert Huang.


But now I need to broadcast video to the group of clients that contact the
piconet, It will be also useful if it is possible to broadcast to parked
devices. I haven't been able to find examples with bluez that allow me to
set-up this type of transmission.

Any help with c commands, guides or examples will be greatly appreciated.

Regards

Marcos Paredes Farrera

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Fwd: Help with l2cap broadcast programming

[Marcos P]

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This is my first post, but it seems that the e-mails are not reaching the
list. Maybe I am doing something wrong.

Marcos

---------- Forwarded message ----------
From: Marcos P <mparedesx@gmail.com>
Date: Apr 24, 2006 1:28 AM
Subject: Help with l2cap broadcast programming
To: bluez-devel@lists.sourceforge.net

Hello

I would like to ask for some help with broadcast with l2cap. I am designing
a video server with bluetooth.

I have been successful in implementing a H263 video server, which is able to
stream video when is contacted by the clients; the server is able to send
unicast video to each client requesting the video. This was easy to
implement by following the examples provided the guided in how to program
bluetooth by Albert Huang.


But now I need to broadcast video to the group of clients that contact the
piconet, It will be also useful if it is possible to broadcast to parked
devices. I haven't been able to find examples with bluez that allow me to
set-up this type of transmission.

Any help with c commands, guides or examples will be greatly appreciated.

Regards

Marcos Paredes Farrera

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Re: [Bluez-devel] Fwd: Help with l2cap broadcast programming

[Brad Midgley]

Marcos

I saw both messages fwiw. The mailing list can be very slow.

You're not using AVDTP to do your unicast video service are you? I don't
see any accommodation for broadcast in the AVDTP spec fwiw.

The core spec talks about broadcast... lt_addr is all 0, llid = 10, ptt
= 0. I looked around for examples using bluez but couldn't find any.

Brad

> This is my first post, but it seems that the e-mails are not reaching
> the list. Maybe I am doing something wrong.
> 
> Marcos
> 
> ---------- Forwarded message ----------
> From: * Marcos P* <mparedesx@gmail.com <mailto:mparedesx@gmail.com>>
> Date: Apr 24, 2006 1:28 AM
> Subject: Help with l2cap broadcast programming
> To: bluez-devel@lists.sourceforge.net
> <mailto:bluez-devel@lists.sourceforge.net>
> 
> Hello
> 
> I would like to ask for some help with broadcast with l2cap. I am
> designing a video server with bluetooth. 


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Re: [Bluez-devel] Fwd: Help with l2cap broadcast programming

[Brad Midgley]

Hey

> The core spec talks about broadcast... lt_addr is all 0, llid = 10, ptt
> = 0. I looked around for examples using bluez but couldn't find any.

I did some more digging and about a year ago Marcel was discussing this.
It sounds like an API for broadcast has not been hammered out and there
may not be an implementation at the lowest (hci) layer.

Brad


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Re: [Bluez-devel] Fwd: Help with l2cap broadcast programming

[Brad Midgley]

Hey

>>The core spec talks about broadcast... lt_addr is all 0, llid = 10, ptt
>>= 0. I looked around for examples using bluez but couldn't find any.

If bluez really can't do this now, you can get it using the affix stack.
We just can't discuss affix here unless it's in the context of improving
bluez.

(There's a special place in hell reserved for replying to myself twice
here :)

Brad


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Re: [Bluez-devel] Fwd: Help with l2cap broadcast programming

[Marcos P]

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Thank you Brad, for your answer.  I am not using AVDTP, we have our own
algorithm to deliver video. The video stream is sent by modifying the
packetization and delivery scheme. For example sending 1 video slice per
packet and delivering each packet with times closer to a Real time
streamming.  In this case the broadcast scheme in the bluetooth standard [*]
seems like a good way to stream video to different clients. In this case the
clients performance will be observed at different distances, and because
they are only in a listening state and the broadcast delivery is not
dependant to the buffer in the client; it is a good case study to analyse
the degradation of service at different positions.



at this time, I was starting to analyse how to use raw sockets in HCI and
l2cap to see if I was able to activate the broadcast mode, however if the
broadcast support is not in the bluez stack shall I then move to the AFFIX
stack???

It is really a pity that the bluez  lacks the support for broadcast.  I
kindly like the TCP/IP sockets similarity of socket programming with bluez.



Regards Marcos




*
http://www.bluetooth.com/Bluetooth/Learn/Works/Data_Transport_Architecture.htm

On 4/24/06, Brad Midgley <bmidgley@xmission.com> wrote:
>
> Hey
>
> >>The core spec talks about broadcast... lt_addr is all 0, llid = 10, ptt
> >>= 0. I looked around for examples using bluez but couldn't find any.
>
> If bluez really can't do this now, you can get it using the affix stack.
> We just can't discuss affix here unless it's in the context of improving
> bluez.
>
> (There's a special place in hell reserved for replying to myself twice
> here :)
>
> Brad
>
>

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