Hello, you made a great job, and I managed to register my program (vb.net) to the SONY SMP-N200.
But I cannot control it....

when I send the commands with
###ipport###: 192.168.1.124:52323 (the ip of the sony.


POST /upnp/control/IRCC HTTP/1.1\r\n
Host: ###ipport###\r\n
User-Agent: MediaRemote/3.0.1 CFNetwork/548.0.4 Darwin/11.0.0\r\n
Content-Length: 317\r\n
Content-Type: text/xml; charset=UTF-8\r\n
SOAPACTION: "urn:schemas-sony-com:service:IRCC:1#X_SendIRCC"\r\n
Connection: close\r\n\r\n

exactly as you described I get an internal Server error:
HTTP/1.1 500 Internal Server Error
Connection: close
Date: Tue, 13 Mar 2012 11:33:46 GMT
Server: Linux/2.6 UPnP/1.0 Media Player/2.0