howto dialup gprs over bloetooth

How I configured my iPAQ H3970 to dial up GPRS over bluetooth with a Sony Ericsson T68i.


Installed familiar 0.7 stable GPE Linux 
See http://www.handhelds.org/


Pin code

changed pin code in /etc/bluetooth/pin
  echo "123456" > /etc/bluetooth/pin
It might be good to use a more secret pin code of your own here.
rebooted ipaq for this to take effect (but reboot is probly not needed).


Turn radio on

I turn radio on by using the bluetooth icon on the panel (lower right on the iPAQ display)

I got a tips from Chris Ottrey that this will turn radio on from command line:
/etc/bluetooth/hciattach

Whichever way you do it the blue LED on the iPAQ should now start flashing


Pairing

Now when the radio is on and the pin code is set it is possible to initiate pairing from the mobile phone.


Information needed

You will need some information. Give the following commande and keep the result.
  hcitool dev

Make your mobile phone discoverable. Scan for other bluetooth units:
  hcitool scan
You should get the bd address and name of your mobile phone.

Check if phone give DUN service: 
  sdptool search --bdaddr <bd> DUN
where <bd> is the bd address of your mobile phone given from hcitool scan.
In my case:
  sdptool search --bdaddr 00:80:37:E9:25:B5 DUN


Device node

Create a node to be used when communicating with the DUN service.
  mknod -m 666 /dev/rfcomm0 c 216 0
  rfcomm bind 0 <bd> <channel>
where <bd> is the bd address of your mobile phone given from hcitool scan.
<channel> is the channel given from sdptool, probably 1.
In my case it it looked like this:
  rfcomm bind 0 00:80:37:E9:25:B5 1
  mknod -m 666 /dev/rfcomm0 c 216 0


Another check

Just some more check (not really needed if you are sure)
  hciconfig
HCI should find a device callded hci0 and give some info about it.


Setting up ppp

Create some scripts and configuration files.

The cuts here are including a cat command so they can be
cut from here and pasted into a command shell. If you
wish to use an editor instead then skip first and last 
line.

First a file telling pppd which files to use. The following 
tells pppd where the ppp options are, which script to use
for dialing and the option file for that dialing script:
---------------- cut and paste from here ----------------
cat > /etc/ppp/peers/gprsbt << EOF
file /etc/ppp/options.gprs
connect "/usr/sbin/chat -f /etc/ppp/chat.gprs"
EOF
------------------------ end cut ------------------------

The options file for pppd may look like this:
---------------- cut and paste from here ----------------
cat > /etc/ppp/options.gprs << EOF
# pppd shall not propose IP address to other peer.
noipdefault

# Accept peers idea of address
ipcp-accept-local

# Add default route
defaultroute
EOF
------------------------ end cut ------------------------

The chat script should exist already but the options 
file for the chat script may look like this:
---------------- cut and paste from here ----------------
cat > /etc/ppp/chat.gprs << EOF
ABORT "BUSY"
"" "\d"
SAY "reseting modem\n"
"" "atz"
SAY "connecting\n"
OK 'AT+CGDATA="PPP",1'
SAY "dialing\n"
CONNECT "atdt*99***1#"
TIMEOUT 60
SAY "connected\n"
EOF
------------------------ end cut ------------------------





Now a connection can be made:
  pppd /dev/rfcomm0 lcp-echo-interval 0 call gprsbt



Test with ping or something.



That all to it!



Well at least until you reeboot.


I made a script for binding rfcomm0 to the DUN in my phone.
NOTE! This file needs to contain hw adresses uniqe for
each user. So first change <bd> and <channel> below to that 
of your phone then just cut and paste:
---------------- cut and paste from here ----------------
cat > /etc/init.d/bind_dun << EOF
rfcomm bind <bd> <channel>
mknod -m 666 /dev/rfcomm0 c 216 0
EOF
------------------------ end cut ------------------------
In my case it looked like this:
---------------- cut and paste from here ----------------
cat > /etc/init.d/bind_dun << EOF
rfcomm bind 0 00:80:37:E9:25:B5 1
mknod -m 666 /dev/rfcomm0 c 216 0
EOF
------------------------ end cut ------------------------
You must run this script after each reboot as root. 
Luckily you probably don't reboot iPAQ that very often.
chmod +x /etc/init.d/bind_dun


And one script for initating a connection.

---------------- cut and paste from here ----------------
cat > /usr/bin/gprsbt << EOF
pppd /dev/rfcomm0 lcp-echo-interval 0 call gprsbt
EOF
------------------------ end cut ------------------------
chmod a+x /usr/bin/gprsbt


Then when you wish to dial up you turn radio on and run gprsbt.
You do not need to be root to do this. But try to remember to
turn radio on (both iPAQ and phone) first.


To terminate connection I turn radio off.


Conclution

At least the above worked for me. If it does not work for you 
you can find the full story on how I did this on my iPAQ at:
http://www.eit.se/hb/misc/text/linux_on_ipaq.txt
Perhaps the links there can give you some help.

Henrik Bjorkman
www.eit.se/hb


Copyright Henrik Bjorkman. May be redistributed as under GPL.