on Android, how to make upnp mr response my m-search?

Question

I am working on Android. And tried to find media renderer in the same lan. I sent out m-search to 239.255.255.250:1900. I captured the message I sent as follow:

M-SEARCH * HTTP/1.1
MX: 5
ST: ssdp:all
MAN: "ssdp:discover
User-Agent: UPnP/1.0 DLNADOC/1.50 Platinum/0.6.8.0-bb / fenda0000
Host: 239.255.255.250:1900
Connection: close

However, no response from mr which do working there.

Answer 1

My mistake, i bypassed the clients' response! Simonc's answer is useful, too.

Answer 2

There's a typo in your MAN header. It needs to have a closing "

MAN: "ssdp:discover"
                   ^

The Connection: close header is not required by the spec. It also doesn't make much sense in a connectionless multicast UDP message. That said, I don't think it'll cause any harm but you could try removing that if the fix to the MAN: header doesn't get things working for you.