NOTIFY * HTTP/1.1 † SERVER:S CLIENT:C ①S→ALL(SSDP) NOTIFY * HTTP/1.1 HOST: 239.255.255.250:1900 LOCATION: http://S_address:S_port/devicedesc.xml … ②C→S(TCP) GET devicedesc.xml HTTP/1.1 ③S→C(TCP) <?root xmlns:… … ?> ↑ M-SEARCH * HTTP/1.1 † ①C→ALL(SSDP) M-SEARCH * HTTP/1.1 HOST: 239.255.255.250:1900 ST: upnp:rootdevice … ②S→C(SSDP) HTTP/1.1 200 OK CACHE-CONTROL: max-age=10800 EXT: LOCATION: http://