RFXtrx is a handy 433.92 MHz transmitter and reciever. Use it to control and sense in a smart home, smart car, smart ship, smart farm you name it.
http://www.rfxcom.com/ It connects to a USB port of your Raspberry Pi.

Install ser2net on your raspberry pi.

sudo apt-get install ser2net

Configure ser2net, edit /etc/ser2net.conf. Comment out the default examples at the end of the file and add one line starting with 10001.


#BANNER:banner:\r\nser2net port \p device \d [\s] (Debian GNU/Linux)\r\n\r\n

10001:raw:0:/dev/ttyUSB0:38400 NONE 1STOPBIT 8DATABITS
#2001:telnet:600:/dev/ttyS1:9600 8DATABITS NONE 1STOPBIT banner
#3000:telnet:600:/dev/ttyS0:19200 8DATABITS NONE 1STOPBIT banner
#3001:telnet:600:/dev/ttyS1:19200 8DATABITS NONE 1STOPBIT banner


Save the file, connect the rfxtrx433(E) and restart the raspi.

Now, the raspi is a tcp server on port 10001. 


On a server that can connect to your raspi on port 10001, install swi prolog.
Install latest software from the development branch. http://www.swi-prolog.org/download/devel

Clone rfxtrx-prolog.git 

sudo apt-get install git

git clone https://github.com/skvamme/rfxtrx-prolog.git

cd rfxtrx-prolog

edit rfxtrx.pl line 6 to point to your Raspberry Pi ip address: tcp_connect('192.168.0.20':10001, StreamPair, []).

Save the file.

Start swipl. If you are on a linux box, just type "swipl", on a mac you have to give the full path to swipl. 
sudo /Applications/SWI-Prolog.app/Contents/MacOS/swipl

In the swipl console, type [rfxtrx].
run().