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POSSDP discovery in Windows 8 Metro not reliable
 

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  1. POSSDP discovery in Windows 8 Metro not reliable
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    <p>I am having problem implementing SSDP discovery in windows 8 metro program. Below is the code:</p> <pre><code>public async Task SearchForDevices() { var socket = new DatagramSocket(); socket.MessageReceived += async (sender, args) =&gt; { Debug.WriteLine("Received data" + DateTime.Now); DataReader reader = args.GetDataReader(); uint count = reader.UnconsumedBufferLength; string data = reader.ReadString(count); Debug.WriteLine(data); var response = new Dictionary&lt;string, string&gt;(); foreach ( string x in data.Split(new[] {"\r\n", "\n"}, StringSplitOptions.None)) { if (x.Contains(":")) { string[] strings = x.Split(':'); response.Add(strings[0].ToLower(), x.Remove(0, strings[0].Length + 1)); } } Device device = await GetXml(response); Debug.WriteLine("Device found"); if (DeviceFound != null) DeviceFound(this, new DeviceFoundEventArgs(device)); }; await socket.BindEndpointAsync(null, ""); HostName hostName = new HostName("239.255.255.250"); socket.JoinMulticastGroup(hostName); string message = "M-SEARCH * HTTP/1.1\r\n" + "HOST: " + hostName.DisplayName + ":1900\r\n" + "ST: upnp:rootdevice\r\n" + "MAN: \"ssdp:discover\"\r\n" + "MX: 3\r\n\r\n"; DateTime start = DateTime.Now; TimeSpan interval = new TimeSpan(0, 0, 30); Debug.WriteLine(start); IOutputStream stream = await socket.GetOutputStreamAsync(hostName, "1900"); var writer = new DataWriter(stream) { UnicodeEncoding = UnicodeEncoding.Utf8 }; writer.WriteString(message); await writer.StoreAsync(); await Task.Delay(1500); } </code></pre> <p>This code is not reliable at all. about 50% times it can't find a connected device while other discover can find. But sometimes it works.</p> <p>My network sniffer (SmartSniff) sometimes can't even capture its SSDP request even though I have made the call many times.</p> <p>I don't think this is an async problem since it does work occasionally. Please help me ! Thanks!</p>
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    1. COI'm not certain you want to pass *hostName* into GetOutputStreamAsync. The fact that this is a multicast socket makes this a hard problem. But I think something else is afoot if you don't even see your "message" hit the wire with your packet sniffer.
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      1. USselbie
 

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