This howto will guide you to build a SMS gateway with Nokia 6230i on Linux machine (Tested on Debian etch).
Hardware requirements:
DKU2 cable (Nokia cable which connects the phone to machine’s USB port)
GSM Nokia 6230i
Linux box with USB interface (Debian prefered 
There are many tools for sms under linux, I tested the Gnokii (Nokia unique tool) and sms-tools v3. Found that sms-tools much more professional and faster.
Connect your phone to the AC power (the DKU2 cable doesn’t charge the phone) and to the machine using the cable.
When you type ‘lsusb’ you should see:
chiq:~/smstools3/scripts# lsusb
Bus 003 Device 015: ID 148f:2573 Ralink Technology, Corp.
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 002: ID 045e:009d Microsoft Corp.
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 017: ID 0421:0428 Nokia Mobile Phones
Bus 001 Device 001: ID 0000:0000
Now the DKU2 cable connects the serial port of the phone to the USB interface, you can access the phone using the serial protocol or the usb protocol. To access using the usb, you need to load gnokii nokia usb module which works slower than the serial way. When using serial connection the GSM AT commands sent directly to the phone and it works better and faster.
You should see /dev/ttyACM0 device, its your emulated serial device.
If you don’t check ‘lsmod’ if you have this modules loaded:
usbcore 112644 7 usbserial,cdc_acm,rt73,usbhid,ehci_hcd,ohci_hcd
If you do, you can use the SMS-TOOLs v2/3 to operate the phone. (On the sms-tools site the Nokia 6230/i is not in the supported phones list but when you use it in serial connection it doesn’t metter at all which phone type you have because it sends plain AT commands to the GSM modem).
Download the sms-tools v3 from http://smstools3.kekekasvi.com/ at http://smstools3.kekekasvi.com/packages/smstools3-3.0.10.tar.gz
tar xvfz smstools3-3.0.10.tar.gz
cd smstools3
make
make install
it will create simple smsd.conf in /etc/smsd.conf
edit the device parameter, put /dev/ttyACM0 there, should look like this:
# Example smsd.conf. Read the manual for a description
devices = GSM1
logfile = /var/log/smsd.log
loglevel = 7
[GSM1]
device = /dev/ttyACM0
incoming = yes
#pin = 1111
Now start the smsd daemon /etc/init.d/sms3 start
check the log file: tail -f /var/log/smsd.log
should look like that:
2007-12-27 21:04:47,7, GSM1: <- 425010502703950
OK
2007-12-27 21:04:47,6, GSM1: IMSI: 425010502703950
2007-12-27 21:04:47,6, GSM1: Checking memory size
2007-12-27 21:04:47,7, GSM1: -> AT+CPMS?
2007-12-27 21:04:47,7, GSM1: Command is sent, waiting for the answer
2007-12-27 21:04:47,7, GSM1: <- +CPMS: "SM",0,20,"SM",0,20,"MT",150,170
OK
2007-12-27 21:04:47,6, GSM1: Used memory is 0 of 20
2007-12-27 21:04:47,6, GSM1: No SMS received
The sms-tools use spool files, all incoming sms messages are stored at:
/var/spool/sms/incoming/
To send a message you can use the tool that comes with the sms-tools.
cd smstools3 (the untared directory of the source)
cd scripts
the tool called sendsms.
What the script does is creating a temp file in the outgoing folder of the spool which looks like this:
To: 491721234567
Hello, this is the sms.
You can create flash SMS messages too:
From: Stefan
To: 491721234567
Flash: yes
Alphabet: ISO
Hello Stefan, how are you?
More information about SMS file format here:
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