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<title>Arduino Reference - EthernetUDPRemotePort </title>
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/**
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* GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann
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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a>
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<p class='vspace'></p><p><a class='wikilink' href='Ethernet.html'>Ethernet</a> : <em>UDP.remotePort()</em>
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</p>
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<p class='vspace'></p><h4>Description</h4>
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<p>Gets the port of the remote UDP connection.
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</p>
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<p class='vspace'></p><p>This function must be called after <a class='wikilink' href='EthernetUDPParsePacket.html'>UDP.parsePacket()</a>.
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p>UDP.remotePort(); <br />
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</p><h4>Parameters</h4>
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<p>None
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>int : the port of the UDP connection to a remote host
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</p>
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<p class='vspace'></p><h4>Example</h4>
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<p>
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<div class='sourceblock ' id='sourceblock1'>
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<div class='sourceblocktext'><div class="arduino"><span class="co2">#include <SPI.h> </span><br />
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<span class="co2">#include <Ethernet.h></span><br />
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<span class="co2">#include <EthernetUdp.h></span><br />
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<br />
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<span class="co1">// Enter a MAC address and IP address for your controller below.</span><br />
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<span class="co1">// The IP address will be dependent on your local network:</span><br />
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<span class="kw1">byte</span> mac<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span> <br />
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<span class="nu12">0xDE</span><span class="sy0">,</span> <span class="nu12">0xAD</span><span class="sy0">,</span> <span class="nu12">0xBE</span><span class="sy0">,</span> <span class="nu12">0xEF</span><span class="sy0">,</span> <span class="nu12">0xFE</span><span class="sy0">,</span> <span class="nu12">0xED</span> <span class="br0">}</span><span class="sy0">;</span><br />
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IPAddress ip<span class="br0">(</span><span class="nu0">192</span><span class="sy0">,</span> <span class="nu0">168</span><span class="sy0">,</span> <span class="nu0">1</span><span class="sy0">,</span> <span class="nu0">177</span><span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="kw1">unsigned</span> <span class="kw1">int</span> localPort <span class="sy0">=</span> <span class="nu0">8888</span><span class="sy0">;</span> <span class="co1">// local port to listen on</span><br />
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<br />
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<span class="co1">// An EthernetUDP instance to let us send and receive packets over UDP</span><br />
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EthernetUDP Udp<span class="sy0">;</span><br />
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<br />
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<span class="kw1">char</span> packetBuffer<span class="br0">[</span>UDP_TX_PACKET_MAX_SIZE<span class="br0">]</span><span class="sy0">;</span> <span class="co1">//buffer to hold incoming packet,</span><br />
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<br />
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<span class="kw1">void</span> <span class="kw3">setup</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="co1">// start the Ethernet and UDP:</span><br />
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Ethernet.<span class="kw1">begin</span><span class="br0">(</span>mac<span class="sy0">,</span>ip<span class="br0">)</span><span class="sy0">;</span><br />
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Udp.<span class="kw1">begin</span><span class="br0">(</span>localPort<span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="br0">}</span><br />
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<br />
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<span class="kw1">void</span> <span class="kw3">loop</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span><br />
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<br />
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<span class="kw1">int</span> packetSize <span class="sy0">=</span> Udp.<span class="me1">parsePacket</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">if</span><span class="br0">(</span>packetSize<span class="br0">)</span><br />
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<span class="br0">{</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">print</span><span class="br0">(</span><span class="st0">"Received packet of size "</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span>packetSize<span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">print</span><span class="br0">(</span><span class="st0">"From "</span><span class="br0">)</span><span class="sy0">;</span><br />
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IPAddress remote <span class="sy0">=</span> Udp.<span class="me1">remoteIP</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw1">int</span> i <span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i <span class="sy0"><</span> <span class="nu0">4</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">)</span><br />
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<span class="br0">{</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">print</span><span class="br0">(</span>remote<span class="br0">[</span>i<span class="br0">]</span><span class="sy0">,</span> <span class="kw2">DEC</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">if</span> <span class="br0">(</span>i <span class="sy0"><</span> <span class="nu0">3</span><span class="br0">)</span><br />
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<span class="br0">{</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">print</span><span class="br0">(</span><span class="st0">"."</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<span class="br0">}</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">print</span><span class="br0">(</span><span class="st0">", port "</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span>Udp.<span class="me1">remotePort</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="co1">// read the packet into packetBufffer</span><br />
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Udp.<span class="kw1">read</span><span class="br0">(</span>packetBuffer<span class="sy0">,</span>UDP_TX_PACKET_MAX_SIZE<span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span><span class="st0">"Contents:"</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span>packetBuffer<span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<span class="br0">}</span><br />
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</div></div>
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<div class='sourceblocklink'><a href='#' type='text/plain'>[Get Code]</a></div>
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<a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em>
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</p>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
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<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain.
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