Re: [Bluez-users] bluetooth remote control

["Sowmya Gattupalli" <sowmya.gattupalli@gmail.com>]

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Hi
well... there is this video by Anil Dhawan which actually implemented in
windows CE os I guess... probably u can look into the video to know more...
He used COM ports get it working.. just look at his video... may be it rings
a bell... (just give Anil Dhawan + Bluetooth in Google)

On 4/12/06, deva seetharam <tagsense@yahoo.com> wrote:
>
> hello all,
> i am building bluetooth based handheld remote control devices.
>
> background information
> ===============
> the remote control devices are based on LMX9820 (National Semiconductor's
> single-chip bluetooth modules).  when buttons are pressed, these devices
> send messages to an application running on a debian linux box. bluetooth
> connectivity is added to this linux box using D-Link DBT-120 bluetooth
> dongle.
>
> attempted architectures
> ==============
> i tried to implement this system using the following architectures:
>
> 1. RFCOMM server
> the linux box runs a bluetooth socket server on a particular channel. the
> remote control device connects to the server over the specific channel and
> sends messages.
>
> problems encountered: multiple remotes can't connect to the same server.
>
> i see that the accept method (unlike tcp implementation) returns the
> server port upon accepting an incoming connection. for instance, if the
> server is listening on port 16, when any remote connects to the server, the
> server port 16 is used to establish end-to-end connection with the client.
> now, another device cannot connect to the same server until the first remote
> disconnects. this problem stops us from using multiple remotes with a single
> linux server.
>
>
> 2. Serial port
> set up one or more bluetooth serial ports and the remote control devices
> can send messages to anyone of them by randomly selecting one of those
> channels.
>
> so i setup a port as listed by rfcomm show:
> rfcomm0: 00:0D:88:C0:61:55 channel 16 clean
>
> > sdptool add --channel=16 sp
>    Serial Port service registered
>
> > rfcomm listen 0 16
> Waiting for connection on channel 16
>
> i tried to connect to rfcomm0 from a *different* linux machine.
>
> problems encountered: can't connect...
>
> >rfcomm connect 00:0D:88:C0:61:55 16
> Can't connect RFCOMM socket: Host is down
>
> (although, when i do a l2ping, the second machine gets replies from the
> first).
>
> Questions
> ======
> 1. what would be the best architecture for implementing bluetooth remote
> control?
> 2. is it possible to configure the accept function to return connection
> specific ports?
> 3. what do i need to get the bluetooth serial port working?
>
> pls. let me know.
>
> thanks in advance,
> dave
>
>
>
>
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