[Bluez-users] emulating a GPRS modem with a linux PC

[Bluez-users] emulating a GPRS modem with a linux PC

[scostas]

Hi all:

I have a PDA and I need to connect to the internet with it, but at work. 
I tried Synce but it doesn't work, because Pocket IE wants a true 
connection, and Synce still doesn't support the desktop passthroug.

So I had the idea of emulating a BlueTooth GPRS modem with the PC. This 
is: the PDA will think that my PC has a GPRS modem and will use it to 
connect to the internet.

Is possible to do that? I tried to do it with pppd and /dev/rfcomm0 but 
I was unable to make it work :(

Thanks.

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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[Michael McConnell]

scostas wrote:
> Hi all:
> 
> I have a PDA and I need to connect to the internet with it, but at work. 
> I tried Synce but it doesn't work, because Pocket IE wants a true 
> connection, and Synce still doesn't support the desktop passthroug.
> 
> So I had the idea of emulating a BlueTooth GPRS modem with the PC. This 
> is: the PDA will think that my PC has a GPRS modem and will use it to 
> connect to the internet.
> 
> Is possible to do that? I tried to do it with pppd and /dev/rfcomm0 but 
> I was unable to make it work :(

You may need to set up some kind of "chat" script to emulate the AT 
interface of the mobile phone, this will take some trial and error since 
everything seems to want to send different commands :-/  The important 
one would be the ATD<whatever> command, in that case send "CONNECT" 
(chat will add the \r\n) then start PPP.

Hope that helps.

-- 
-- Michael "Soruk" McConnell
   Eridani Star System

   MailStripper - http://www.MailStripper.eu/ - SMTP spam filter
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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[scostas]

Michael McConnell escribi=F3:

Hi Michael:

>> So I had the idea of emulating a BlueTooth GPRS modem with the PC. This =

>> is: the PDA will think that my PC has a GPRS modem and will use it to =

>> connect to the internet.

> You may need to set up some kind of "chat" script to emulate the AT =

> interface of the mobile phone, this will take some trial and error since =

> everything seems to want to send different commands :-/  The important =

> one would be the ATD<whatever> command, in that case send "CONNECT" =

> (chat will add the \r\n) then start PPP.

The problem is that I didn't receive AT commands. I'm not sure that I =

have configured the RFCOMM port fine. That's my first question: how do I =

have to set up it?

I tried with

	rfcomm connect 0 XX:XX:XX:XX:XX:XX

then I launched a cat /dev/rfcomm0 and tried to connect from the PDA, =

but I didn't receive AT commands.

Thanks.

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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[Michael McConnell]

scostas wrote:
> Michael McConnell escribi=F3:
> =

> Hi Michael:
> =

> =

>>>So I had the idea of emulating a BlueTooth GPRS modem with the PC. This =

>>>is: the PDA will think that my PC has a GPRS modem and will use it to =

>>>connect to the internet.
> =

> =

>>You may need to set up some kind of "chat" script to emulate the AT =

>>interface of the mobile phone, this will take some trial and error since =

>>everything seems to want to send different commands :-/  The important =

>>one would be the ATD<whatever> command, in that case send "CONNECT" =

>>(chat will add the \r\n) then start PPP.
> =

> =

> The problem is that I didn't receive AT commands. I'm not sure that I =

> have configured the RFCOMM port fine. That's my first question: how do I =

> have to set up it?
> =

> I tried with
> =

> 	rfcomm connect 0 XX:XX:XX:XX:XX:XX
> =

> then I launched a cat /dev/rfcomm0 and tried to connect from the PDA, =

> but I didn't receive AT commands.

It's been a while since I had to play with inbound BT connections, but =

IIRC rather than making a connection back to the PDA like what you've =

done above, the PDA is trying to open a new session so you need =

something listening for the inbound BT RFCOMM connection. But I'll be =

damned if I can remember exactly what you need :(

-- =

-- Michael "Soruk" McConnell
   Eridani Star System

   MailStripper - http://www.MailStripper.eu/ - SMTP spam filter
   Mail Me Anywhere - http://www.MailMeAnywhere.com/ - Mobile email

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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[scostas]

Michael McConnell escribi=F3:

Hi:

> It's been a while since I had to play with inbound BT connections, but =

> IIRC rather than making a connection back to the PDA like what you've =

> done above, the PDA is trying to open a new session so you need =

> something listening for the inbound BT RFCOMM connection.

Yes, that was the point. I used

	rfcomm listen /dev/rfcomm0 0

and a little python script to answer the AT commands, and it started to =

work. But I don't know the right answer for the AT+CREG? command.

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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[Michael McConnell]

scostas wrote:
> Michael McConnell escribi=F3:
> =

> Hi:
> =

> =

>>It's been a while since I had to play with inbound BT connections, but =

>>IIRC rather than making a connection back to the PDA like what you've =

>>done above, the PDA is trying to open a new session so you need =

>>something listening for the inbound BT RFCOMM connection.
> =

> =

> Yes, that was the point. I used
> =

> 	rfcomm listen /dev/rfcomm0 0
> =

> and a little python script to answer the AT commands, and it started to =

> work. But I don't know the right answer for the AT+CREG? command.

"OK" should be fine. I'd say answer "OK" to everything apart from ATD, =

which should get "CONNECT" then start PPP.

-- =

-- Michael "Soruk" McConnell
   Eridani Star System

   MailStripper - http://www.MailStripper.eu/ - SMTP spam filter
   Mail Me Anywhere - http://www.MailMeAnywhere.com/ - Mobile email

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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[Stefan Seyfried]

On Mon, Nov 20, 2006 at 01:44:09PM +0100, scostas wrote:

> and a little python script to answer the AT commands, and it started to =

> work. But I don't know the right answer for the AT+CREG? command.

This is pretty off-topic here, and a simple google search for "gsm at coman=
ds"
would have lead you quickly to =

http://webapp.etsi.org/key/key.asp?GSMSpecPart1=3D27&GSMSpecPart2=3D007
and (with a small detour, i admit :-) to:
http://www.3gpp.org/ftp/Specs/archive/27_series/27.007/
-- =

Stefan Seyfried
QA / R&D Team Mobile Devices        |              "Any ideas, John?"
SUSE LINUX Products GmbH, N=FCrnberg  | "Well, surrounding them's out." =


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Re: [Bluez-users] emulating a GPRS modem with a linux PC

[Philip Barnes]

I use this a lot to connect my palm T2 to the net through my pc. I am currently running fc6, however my config has not changed from fc5.

<pedant>
I suspect you mean use, the linux box as a WAP/router, GPRS is a GSM data protocol.
</pedant>

The relevant parts of my rc.local file are below.

HTH Phil

-- start of rc.local
mknod /dev/rfcomm0 c 216 0
mknod /dev/rfcomm1 c 216 1
/sbin/modprobe rfcomm
#
# Start configuration of Bluetooth network
/usr/sbin/hciconfig hci0 up
/usr/sbin/hcid
/usr/sbin/sdpd
dund --listen --msdun 192.168.1.200:192.168.1.201
echo '1' > /proc/sys/net/ipv4/ip_forward
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
/sbin/iptables -A FORWARD -i ppp0 -j ACCEPT
/sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED
#
-- end of rc.local


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