How to dialup using a mobile phone via Bluetooth

Forum: DSL Tips and Tricks
Topic: How to dialup using a mobile phone via Bluetooth
started by: Juanito

Posted by Juanito on Jan. 19 2007,08:30

This is part 2 of the DSL Bluetooth how-to. In order to proceed from here, you will need to have Bluetooth up and running on your DSL machine and be able to "pair" with a Bluetooth mobile phone as described in part 1 - see post " How to start Bluetooth & Pair with a remote device"

In order to connect to the modem in your mobile phone over a Bluetooth connection, you need to first discover which channel your phone uses for dial-up networking (DUN). Apparently the channel number changes from manufacturer to manufacturer and even from model to model. The service discovery protocal daemon does not always appear to start automatically, so you may need to start this before checking for the DUN channel - note the output has been edited to only show what we are looking for:

# sdpd
# sdptool browse 00:0A:D9:E8:4A:65 [put your phone bt address here]
Browsing 00:0A:D9:E8:4A:65 ...
...
Service Name: Dial-up Networking
Service Description: Dial-up Networking
Service Provider: Sony Ericsson
Service RecHandle: 0x1000c
Service Class ID List:
"Dialup Networking" (0x1103)
Protocol Descriptor List:
"L2CAP" (0x0100)
"RFCOMM" (0x0003)
Channel: 7
Language Base Attr List:
code_ISO639: 0x656e
encoding: 0x6a
base_offset: 0x100
Profile Descriptor List:
"Dialup Networking" (0x1103)
Version: 0x0100

Now we know DUN is on channel 7, we can configure a bt communications port in order to communicate with the phone modem. Note that the device may not exist in DSL so we will need to create it - this seems to work best when you create it after configuring it:

# rfcomm bind 0 00:0A:D9:E8:4A:65 7 [leading zero=rfcomm0, trailing 7=DUN]
# rfcomm show
rfcomm0: 00:0A:D9:E8:4A:65 channel 7 clean

# mknod -m 666 /dev/rfcomm0 c 216 0

Now the communications port is created, we need to register the service:

# sdptool add --channel=7 DUN [two dashes before channel]
Dial-Up Networking service registered

I did not manage to get microcomm to communicate with the phone modem, so you will need to use wvdial or similar. Since wvdial will not scan for rfcomm0, we need to fool it by deleting an unused port (/dev/ttyS3 on my machine) and symlinking it to rfcomm0. Once wvdial is configured, you can edit /dev/ttyS3 back to /dev/rfcomm0. Note that your phone may ask for your Bluetooth PIN when the wvdialconf command is issued:

# apt-get install wvdial
# rm /dev/ttyS3
# ln -s /dev/rfcomm0 /dev/ttyS3
# wvdialconf /etc/wvdial.conf
Scanning your serial ports for a modem.

Port Scan<*1>: S4 S5 S6 S7 S14 S15 ACM0 ACM1
...
ttyS3<*1>: ATQ0 V1 E1 -- OK
ttyS3<*1>: ATQ0 V1 E1 Z -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttyS3<*1>: Modem Identifier: ATI -- P900
ttyS3<*1>: Speed 4800: AT -- OK
ttyS3<*1>: Speed 9600: AT -- OK
ttyS3<*1>: Speed 19200: AT -- OK
ttyS3<*1>: Speed 38400: AT -- OK
ttyS3<*1>: Speed 57600: AT -- OK
ttyS3<*1>: Speed 115200: AT -- OK
ttyS3<*1>: Speed 230400: AT -- OK
ttyS3<*1>: Speed 460800: AT -- OK
ttyS3<*1>: Max speed is 460800; that should be safe.
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK

Found a modem on /dev/ttyS3.
Modem configuration written to wvdial.conf.
ttyS3<Info>: Speed 460800; init "ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0"

You will need to make the following modifications to /etc/wvdial.conf:

[Dialer Defaults]
Modem = /dev/ttyS3 [change to /dev/rfcomm0 after reboot]
Baud = 460800
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = Analog Modem
; Phone = <Target Phone Number> [remove ";" & enter your ISP #]
; Username = <Your Login Name> [remove ";" & enter your login]
; Password = <Your Password> [remove ";" & enter your password]

Now you're ready to dial-up to your ISP - again, your phone may ask for the PIN:

# wvdial
--> WvDial: Internet dialer version 1.54.0
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT123456789
--> Waiting for carrier.
ATDT123456789
CONNECT 9600 [seems GSM over Bluetooth is not that quick...]
--> Carrier detected. Waiting for prompt.
Username:
--> Looks like a login prompt.
--> Sending: abcdefg
abcdefg
Password:
--> Looks like a password prompt.
--> Sending: (password)
--> Don't know what to do! Starting pppd and hoping for the best.
--> Starting pppd at Fri Jan 19 12:01:01 2007
--> pid of pppd: 1470
--> Using interface ppp0
--> local IP address 86.96.102.248
--> remote IP address 213.42.8.12
--> primary DNS address 213.42.20.20
--> secondary DNS address 195.229.241.222
....
Success...
....
<ctrl-c>
Caught signal #2! Attempting to exit gracefully...

That's it - have fun (and now to work on the GPRS connection).