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copied!<p>Just announce the service, just like <a href="https://stackoverflow.com/q/3845920/39974">tc. has said below</a>:</p> <pre><code>self.netService = [[[NSNetService alloc] initWithDomain:@"" type:@"_http._tcp" name:@"" port:8080] autorelease]; [self.netService publish]; </code></pre> <p>With iOS5, however, let's-call-it "Bluetooth Bonjour" is disabled by default, so you have to use the C API declared in <code><dns_sd.h></code>.</p> <pre><code>DNSServiceRef serviceRef; DNSServiceRegister(&serviceRef, // sdRef kDNSServiceFlagsIncludeP2P, // interfaceIndex 0, // flags NULL, // name "_http._tcp", // regtype NULL, // domain NULL, // host 1291, // port 0, // txtLen NULL, // txtRecord NULL, // callBack, NULL // context ); </code></pre> <p>This is just the announcement part; resolving is a bit more complex. I suggest you take a look at the following examples from Apple:</p> <ul> <li>SRVResolver - demonstrates how you can look up a service using API declared in <code><dns_sd.h></code>. Targets OS X, but includes a class called <code>SRVResolver</code> which you can use on iOS as easily as you can use it on OS X. For iOS 5 Bluetooth P2P to work, update the call to <code>DNSServiceQueryRecord()</code> to pass <code>kDNSServiceFlagsIncludeP2P</code> as the <code>interfaceIndex</code>. <i>(<b>NOTE!</b> This sample does not seem to exist in OS X 10.8 docset. It can be found in 10.6 and 10.7 docsets. In 10.8, there's the DNSSDObjects example, but I didn't look exactly at what it does.)</i></li> <li>WiTap - as long as you don't actually care about Bluetooth support on iOS 5, just look at the example called WiTap, which demonstrates not only the beautiful Objective-C API, but also how you can create a server using CFSocket APIs (thin wrappers around BSD sockets). You'll want to look at this even if you are using SRVResolver to see how to use C-based API from <code><dns_sd.h></code>.</li> </ul> <p>After announcing or resolving your service, you use regular BSD sockets to listen or connect. When writing a server, you may even want to first <code>listen()</code> on port 0 (zero), and then query which random available port was assigned to you. After querying for that, announce this port instead of a fixed one. That's exactly what WiTap example is doing (but with CFSocket API instead of BSD socket API).</p> <p>For more info on BSD sockets, just Google around for a tutorial.</p> <p><em>Note: information about iOS 5 comes from Apple's <a href="http://developer.apple.com/library/ios/#qa/qa1753/_index.html#//apple_ref/doc/uid/DTS40011315" rel="nofollow noreferrer">Technical Q&A QA1753</a>.</em></p>

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