gagol.eu

Malmö 11.12.2012

Despite of growing popularity of smartphones and tablets some people (as me)
prefers rather small laptops and netbooks as portable devices. Together with 3g
phone with bluetooth it's quite a good solution for mobility.

There is a lot of tutorials about using bluetooth networking on Linux, here are
my experience.

I have never had any problem with Sony Ericson telephones. They always create
interface usb0 on Ubuntu and work out of the box after connecting the usb cable.
But once I've got LG and I couldn’t use phone as modem. It was possible only
with Windows application.

This is how I use phone as modem with help of bluetooth.

Pair phone with computer via bluetooth.
Edit file /etc/bluetootth/rfcomm.conf it should look like this: 

rfcomm0 {
	# Automatically bind the device at startup
	bind no;

	# Bluetooth address of the device
	device 20:21:A5:8A:4F:CE;

	# RFCOMM channel for the connection
	channel	7;

	# Description of the connection
	comment "LG-GW520-Pawel";
}
Replace bluetooth device address with bluetooth MAC of your phone and feel free
to change comment.

Create file /etc/ppp/peers/chat-blue
I use swedish Comviq/Tele2 service. You mast do changes for you provider. 

TIMEOUT 5
ECHO ON
ABORT '\nBUSY\r'
ABORT '\nERROR\r'
ABORT '\nNO ANSWER\r'
ABORT '\nNO CARRIER\r'
ABORT '\nNO DIALTONE\r'
ABORT '\nRINGING\r\n\r\nRINGING\r'
'' \rAT
TIMEOUT 12
SAY "Press CTRL-C to close the connection at any stage!"
SAY "\ndefining PDP context...\n"
OK ATH
OK ATE1
OK 'AT+CGDCONT=1,"IP","internet.tele2.se"'
OK ATM1L3DT*99#
TIMEOUT 10
SAY "\nwaiting for connect...\n"
CONNECT ""
Now create file /etc/ppp/peers/blue-net 
/dev/rfcomm0 115200
connect "/usr/sbin/chat -v -f /etc/ppp/peers/chat-blue"
noauth
# name internet.tele2.se
defaultroute
updetach
To start connection I run commands: 
rfcomm bind rfcomm0 20:21:A5:8A:4F:CE 7
pppd call blue-net

It can happen that I get no DNS servers, so I created file at my home directory
/home/pawel/resolv.conf 

nameserver 208.67.222.222
nameserver 208.67.220.220
and run command 
cp /home/pawel/resolv.conf /etc/