[Bluez-users] rfcomm confusion

Ken

author

2004-05-19 12:05 UTC #0 lore raw

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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Marcel Holtmann

maintainer

2004-05-19 12:25 UTC #1 lore raw

Hi Ken,

Quoted 2 lines

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?

Quoted 2 lines

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.

Quoted 2 lines

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?

Quoted 5 lines

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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Ken

author

2004-05-20 08:50 UTC #2 lore raw

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:

Quoted 1 line

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

Quoted 45 lines · Marcel Holtmann

Hi Ken,
Quoted 3 lines
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?
Quoted 3 lines
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.
Quoted 3 lines
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?
Quoted 5 lines
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

Quoted 12 lines

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Marcel Holtmann

maintainer

2004-05-20 09:25 UTC #3 lore raw

Hi Ken,

Quoted 17 lines

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:
Quoted 1 line
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.

Quoted 6 lines

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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