Home automation controller/server needed

[miuri]

Hi guys. i'm looking for a device that allows me to supervise a pre-existent BTicino home alarm system. This system can communicate via RS-232 (or USB) interface using an open protocol (Openwebnet).
I need to be able to:

1. intercept events from the RS-232 communication (well-known byte sequences coming from the serial port)
2. and then feedback through GSM network (SMS messages).


The basic requirements i need are:

* VERY LOW POWER COMSUMPTION (<= 5 W)
* RS232 or USB interface (communication with the alarm system gateway)
* another RS232 or USB interface (communication with a GSM module)
* 12 V supply (or the possibility to plug a battery to ensure electrical continuity)
* Programmability features (to host the logic for interecept and react to events)


Until now i’have evaluated this solutions:

* FIT PC-2: _http://www.fit-pc.com/web/fit-pc2/
o A full computer with very green power supply (5W). In addition it could host a web server providing further connections capabilities. Too much expensive.
* Sheeva Plug / GuruPlug _http://www.globalscaletechnologies.com/t-guruplugdetails.aspx
* Telit GM 862 _http://www.telit.com/en/products.php?p_id=3&p_ac=show&p=4
* ???


Which hardware platform i need?
Thank you all!

[wwolkers]

a Jeenode with an extra serial port should allow you to do this, if you know your way around arduino programming.
check http://www.jeelabs.org/