114 lines
4.6 KiB
HTML
114 lines
4.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<style type="text/css">
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body
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{
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font-family: Verdana, Geneva, Arial, sans-serif;
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font-size: small;
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margin-left: 20px;
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background-color: #dddddd;
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}
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td
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{
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font-family: Verdana, Geneva, Arial, sans-serif;
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font-size: small;
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}
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.page
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{
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width: 700px;
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}
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.cf
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{
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font-family: Courier New;
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font-size: 10pt;
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color: black;
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background: white;
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padding: 16px;
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border: 1px solid black;
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}
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.cl
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{
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margin: 0px;
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}
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.cb1
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{
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color: green;
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}
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.cb2
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{
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color: #2b91af;
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}
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.cb3
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{
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color: blue;
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}
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.cb4
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{
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color: #a31515;
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}
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</style>
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<title>Peer/server discovery</title>
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</head>
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<body>
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<table>
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<tr>
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<td class="page">
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<h1>Peer/server discovery</h1>
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<p>
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Peer discovery is the process of clients detecting what servers are available. Discovery requests can be made in two ways;
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locally as a broadcast, which will send a signal to all peers on your subnet. Secondly you can contact an ip address directly
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and query it if a server is running.
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</p>
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<p>Responding to discovery requests are done in the same way regardless of how the request is made.</p>
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<p>Here's how to do on the client side; ie. the side which makes a request:</p>
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<div class="cf">
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<pre class="cl"><span class="cb1">// Enable DiscoveryResponse messages</span></pre>
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<pre class="cl">config.EnableMessageType(<span class="cb2">NetIncomingMessageType</span>.DiscoveryResponse);</pre>
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<pre class="cl"> </pre>
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<pre class="cl"><span class="cb1">// Emit a discovery signal</span></pre>
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<pre class="cl">Client.DiscoverLocalPeers(14242);</pre>
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</div>
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<p>This will send a discovery signal to your subnet; Here's how to receive the signal on the server side, and send a response back to the client:</p>
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<div class="cf">
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<pre class="cl"><span class="cb1">// Enable DiscoveryRequest messages</span></pre>
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<pre class="cl">config.EnableMessageType(<span class="cb2">NetIncomingMessageType</span>.DiscoveryRequest);</pre>
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<pre class="cl"> </pre>
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<pre class="cl"><span class="cb1">// Standard message reading loop</span></pre>
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<pre class="cl"><span class="cb3">while</span> ((inc = Server.ReadMessage()) != <span class="cb1">null</span>)</pre>
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<pre class="cl">{</pre>
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<pre class="cl"> <span class="cb3">switch</span> (inc.MessageType)</pre>
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<pre class="cl"> {</pre>
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<pre class="cl"> <span class="cb3">case</span> <span class="cb2">NetIncomingMessageType</span>.DiscoveryRequest:</pre>
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<pre class="cl"> </pre>
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<pre class="cl"> <span class="cb1">// Create a response and write some example data to it</span></pre>
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<pre class="cl"> <span class="cb2">NetOutgoingMessage</span> response = Server.CreateMessage();</pre>
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<pre class="cl"> response.Write(<span class="cb4">"My server name"</span>);</pre>
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<pre class="cl"> </pre>
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<pre class="cl"> <span class="cb1">// Send the response to the sender of the request</span></pre>
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<pre class="cl"> Server.SendDiscoveryResponse(response, inc.SenderEndpoint);</pre>
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<pre class="cl"> <span class="cb3">break</span>;</pre>
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</div>
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<p>When the response then reaches the client, you can read the data you wrote on the server:</p>
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<div class="cf">
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<pre class="cl"><span class="cb1">// Standard message reading loop</span></pre>
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<pre class="cl"><span class="cb3">while</span> ((inc = Client.ReadMessage()) != <span class="cb1">null</span>)</pre>
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<pre class="cl">{</pre>
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<pre class="cl"> <span class="cb3">switch</span> (inc.MessageType)</pre>
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<pre class="cl"> {</pre>
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<pre class="cl"> <span class="cb3">case</span> <span class="cb2">NetIncomingMessageType</span>.DiscoveryResponse:</pre>
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<pre class="cl"> </pre>
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<pre class="cl"> <span class="cb2">Console</span>.WriteLine(<span class="cb4">"Found server at "</span> + inc.SenderEndpoint + <span class="cb4">" name: "</span> + inc.ReadString());</pre>
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<pre class="cl"> <span class="cb3">break</span>;</pre>
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</div>
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</td>
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</tr>
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</table>
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</body>
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</html>
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