with Chrome canary, type
chrome://extensions
in the address bar, check "Developer Mode" and click "load unpackaged ...". Then specify this apps directory.
With above step, you'll find "UPnP Checker".
click link
_generated_background_page.html
then at the "Console" tab, typing
upnp.search("ssdp:all");
you'll find UPnP device that responds to M-SEARCH.
parameter of upnp.search() indicating ST (it stands for Search Target). So, if you want to search specific target, please specify it.
ex. upnp.search("upnp:rootdevice");