[Bluez-users] rfcomm confusion

[Bluez-users] rfcomm confusion

[Ken]

I am trying to create a bluetooth serial connection between my linux 
laptop and iPAQ pda.
I'm using the command "rfcomm connect hci0 00:11:22:33 1" and it appears 
to work.
the connection shows up on the iPAQ and when I go to the status it 
displays 0 bytes transfered - 0 bytes received.

so, now i'm trying to send some data over this connection. my 
expectation was that i could do something like:
echo "test" > /dev/rfcomm0
and then see 4 bytes received on the iPAQ interface, however the byte 
counts on the ipaq remain 0.

does it make sense to try and send data this way? if not, can anybody 
suggest how i should be trying to send data over an rfcomm connection?

thanks!
ken




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Re: [Bluez-users] rfcomm confusion

[Marcel Holtmann]

Hi Ken,

> I am trying to create a bluetooth serial connection between my linux 
> laptop and iPAQ pda.

is this a Windows or a Linux based iPAQ?

> I'm using the command "rfcomm connect hci0 00:11:22:33 1" and it appears 
> to work.

The <dev> is not the HCI device. It is the RFCOMM device you wanna
create. So use "rfcomm0" or "0" for short.

> the connection shows up on the iPAQ and when I go to the status it 
> displays 0 bytes transfered - 0 bytes received.

Where do you see this?

> so, now i'm trying to send some data over this connection. my 
> expectation was that i could do something like:
> echo "test" > /dev/rfcomm0
> and then see 4 bytes received on the iPAQ interface, however the byte 
> counts on the ipaq remain 0.

Actually this depends on the program on the other side. If it is a
Windows iPAQ I don't know how they count the bytes.

Regards

Marcel




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Re: [Bluez-users] rfcomm confusion

[Ken]

Hi Marcel,
Thanks for the response.  It is Windows on the iPAQ.
I've tried again using /dev/rfcomm0 for <dev> but the results are the 
same. (I think it was defaulting to rfcomm0 before even though I put 
hci0 in the <dev> field)

So, in linux I do:
 > rfcomm connect /dev/rfcomm0 08:00:28:90:25:D6 1
Connected /dev/rfcomm0 to 08:00:28:90:25:D6 on channel 1
Press CTRL-C for hangup

When I do this the iPAQ shows a connection icon, and when click into the 
status screen for that connection it shows me the details including 
connection time, activity, and signal strength.

Everything looks good but the activity always shows 0 bytes transfered 
and 0 bytes received.

So, I guess my question is, how do I send data through this connection?
Should I just be able to echo data into /dev/rfcomm0? (ie: echo "some 
data" > /dev/rfcomm0)

Or is it the case that I need an application on the iPAQ side to be 
listening for data before it will show any bytes received or transfered?

I hope this makes sense.
Thanks!
Ken

Marcel Holtmann wrote:

>Hi Ken,
>
>  
>
>>I am trying to create a bluetooth serial connection between my linux 
>>laptop and iPAQ pda.
>>    
>>
>
>is this a Windows or a Linux based iPAQ?
>
>  
>
>>I'm using the command "rfcomm connect hci0 00:11:22:33 1" and it appears 
>>to work.
>>    
>>
>
>The <dev> is not the HCI device. It is the RFCOMM device you wanna
>create. So use "rfcomm0" or "0" for short.
>
>  
>
>>the connection shows up on the iPAQ and when I go to the status it 
>>displays 0 bytes transfered - 0 bytes received.
>>    
>>
>
>Where do you see this?
>
>  
>
>>so, now i'm trying to send some data over this connection. my 
>>expectation was that i could do something like:
>>echo "test" > /dev/rfcomm0
>>and then see 4 bytes received on the iPAQ interface, however the byte 
>>counts on the ipaq remain 0.
>>    
>>
>
>Actually this depends on the program on the other side. If it is a
>Windows iPAQ I don't know how they count the bytes.
>
>Regards
>
>Marcel
>
>
>
>
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>  
>



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Re: [Bluez-users] rfcomm confusion

[Marcel Holtmann]

Hi Ken,

> Thanks for the response.  It is Windows on the iPAQ.
> I've tried again using /dev/rfcomm0 for <dev> but the results are the 
> same. (I think it was defaulting to rfcomm0 before even though I put 
> hci0 in the <dev> field)
> 
> So, in linux I do:
>  > rfcomm connect /dev/rfcomm0 08:00:28:90:25:D6 1
> Connected /dev/rfcomm0 to 08:00:28:90:25:D6 on channel 1
> Press CTRL-C for hangup
> 
> When I do this the iPAQ shows a connection icon, and when click into the 
> status screen for that connection it shows me the details including 
> connection time, activity, and signal strength.
> 
> Everything looks good but the activity always shows 0 bytes transfered 
> and 0 bytes received.
> 
> So, I guess my question is, how do I send data through this connection?
> Should I just be able to echo data into /dev/rfcomm0? (ie: echo "some 
> data" > /dev/rfcomm0)
> 
> Or is it the case that I need an application on the iPAQ side to be 
> listening for data before it will show any bytes received or transfered?

I think so, but I don't have any knowledge about Windows operating
systems.

Regards

Marcel




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Re: [Bluez-users] rfcomm confusion

[Richard Pruen]

Hello Marcel, and Ken,

  >> Or is it the case that I need an application on the iPAQ side to be 
   >> listening for data before it will show any bytes received or transfered?
   >
   >I think so, but I don't have any knowledge about Windows operating
   >systems.

You are correct, there needs to be some aplication on the Win CE device to receive the data.

Richard

Re: [Bluez-users] rfcomm confusion

[Richard Pruen]

Hello Marcel, and Ken,

  >> Or is it the case that I need an application on the iPAQ side to be 
   >> listening for data before it will show any bytes received or transfered?
   >
   >I think so, but I don't have any knowledge about Windows operating
   >systems.

You are correct, there needs to be some aplication on the Win CE device to receive the data.

Richard



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Re: [Bluez-users] rfcomm confusion

[Ken]

Hi Richard and Marcel,
You are right. Thank your for the responses!  As soon as I got an 
application listening on the Windows side it starting receiving data.

Ken

Richard Pruen wrote:

>Hello Marcel, and Ken,
>
>  >> Or is it the case that I need an application on the iPAQ side to be 
>   >> listening for data before it will show any bytes received or transfered?
>   >
>   >I think so, but I don't have any knowledge about Windows operating
>   >systems.
>
>You are correct, there needs to be some aplication on the Win CE device to receive the data.
>
>Richard
>
>
>
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>