UPnP announce goes out, but device is not discovered

i am writing code for a UPnP device to announce itself. i have no interest in it being able to discover other UPnP devices on the network. i am sending out the following messages (taken from wireshark)

NOTIFY * HTTP/1.1\r\n
NT: upnp:rootdevice\r\n
USN: uuid:0000-1111-2222-3333::upnp:rootdevice\r\n
NTS: ssdp:alive\r\n
LOCATION: http://192.168.40.8:80/rdd2.xml\r\n
HOST: 239.255.255.250:1900\r\n
CACHE-CONTROL: max-age=900\r\n
Content-Length: 0\r\n
\r\n   

AND

NOTIFY * HTTP/1.1\r\n
NT: urn:schemas-upnp-org:device:BinaryLight:1\r\n
USN: uuid:0000-1111-2222-3333::urn:schemas-upnp-org:device:BinaryLight:1\r\n
NTS: ssdp:alive\r\n
LOCATION: http://192.168.40.8:80/rdd2.xml\r\n
HOST: 239.255.255.250:1900\r\n
CACHE-CONTROL: max-age=900\r\n
Content-Length: 0\r\n
\r\n 

AND

NOTIFY * HTTP/1.1\r\n
NT: uuid:0000-1111-2222-3333\r\n
USN: uuid:0000-1111-2222-3333\r\n
NTS: ssdp:alive\r\n
LOCATION: http://192.168.40.8:80/rdd2.xml\r\n
HOST: 239.255.255.250:1900\r\n
CACHE-CONTROL: max-age=900\r\n
Content-Length: 0\r\n
\r\n 

the device will not discover (either on the Win 7 page where i see my other UPnP devices or on Intel's Device Spy for UPnP Technologies -- see update). i have 2 questions. first, are all of these messages necessary? and second, can anyone see why my device would not be discovered?

other info:

my rdd2.xml device description file

<?xml version="1.0"?>  
<root>  
  <specVersion>  
    <major>1</major>  
    <minor>0</minor>  
  </specVersion>  

  <device>  
    <deviceType>urn:schemas-upnp-org:device:BinaryLight:1</deviceType>  
    <friendlyName>RFLC</friendlyName>  
    <manufacturer>Legrand</manufacturer>  
    <manufacturerURL>http://www.legrand.us/</manufacturerURL>  
    <modelDescription>Legrand Low Cost RF Lighting Control</modelDescription>  
    <modelName>X-10L1</modelName>  
    <modelNumber>L1</modelNumber>  
    <modelURL>http://www.legrand.us/</modelURL>  
    <serialNumber>0000001</serialNumber>  
    <UDN>uuid:0000-1111-2222-3333</UDN>  
    <UPC>00000-00001</UPC>
    <presentationURL>pres.html</presentationURL>  
  </device>  
</root>  

and some info from wireshark (a view down one msgs frame list)开发者_如何学Go

• Frame .....
• Ethernet II, Src: my device , Dst: 239.255.255.250
• Internet Protocol, Src Port: ssdp (1900), Dst Port: ssdp (1900)

• Hypertext Transfer Protocol

  ... msgs from above are here...

UPDATE: i CAN see the device on intel's upnp utilities. that was a mistake writing that. the device was running under a debugger, and once rebooted with no debugger, it DID discover in the utilities. i still cannot see it on windows 7 though? any thoughts?

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It appears that SERVER: is a required header -- at least one client I was playing with did not like notifications with no SERVER:

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For some crazy reason I had better luck when I set this field to have extra spaces: CACHE-CONTROL: max-age = 900\r\n