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    <p>Looks like you are using the <code>WiShield</code> library. There should be an examples folder in the <code>WiShield</code> download with a <code>SocketApp</code> and <code>UDPApp</code> example. This is a good place to start.</p> <p>A few things I learned while making a UDP app.</p> <ol> <li><p>You may have to edit some #defines (<em>e.g. <code>APP_UDPAPP</code> in <code>apps-conf.h</code>, <code>UIP_CONF_UDP</code> in <code>uip-conf.h</code></em>) before recompiling your app.</p></li> <li><p>If you are doing a <code>UDP</code> app, keep in mind that you have a limited receive buffer (<em><code>UIP_CONF_BUFFER_SIZE</code> in <code>uip-conf.h</code> sets it to <strong>400</strong></em>). My router was sending out a UDP broadcast XML message that was <strong>~700 bytes</strong> which caused this buffer to overflow and over write other data. I don't think TCP will have this problem because it will negotiate a MSS that won't overrun the buffer.</p></li> </ol> <p>In the end I made changes to the <code>handle_connection()</code> function in the <code>UDPapp</code> example. Below is a snippet (<em>with <code>uip_ipaddr</code> set to <code>255.255.255.255</code></em>).</p> <pre class="lang-cpp prettyprint-override"><code>void send_state(void) { sprintf((char*)uip_appdata, "state %ld %ld %ld %c %d", clock_time(), state.sensors.ping[0].cm, state.sensors.ping[1].cm, state.actuators.chassis.direction, state.actuators.chassis.speed); uip_send(uip_appdata, strlen((char*)uip_appdata)); } void send_beacon(void) { if(timer_expired(&amp;beacon_timer)) { timer_reset(&amp;beacon_timer); sprintf((char*)uip_appdata, "beacon %ld", clock_time()); uip_send(uip_appdata, strlen((char*)uip_appdata)); uip_log("beacon sent"); } } boolean data_or_poll(void) { return (uip_newdata() || uip_poll()); } static PT_THREAD(handle_connection(void)) { PT_BEGIN(&amp;s.pt); PT_WAIT_UNTIL(&amp;s.pt, data_or_poll()); if(uip_newdata()) { uip_flags &amp;= (~UIP_NEWDATA); send_state(); } else if (uip_poll()) { uip_flags &amp;= (~UIP_POLL); send_beacon(); } PT_END(&amp;s.pt); } </code></pre>
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    1. POSend Arduino data via a Wi-Fi shield to a specific IP address on the LAN
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    1. USPaul T. Rawkeen
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    1. COVery helpful! Thanks for the heads-up on buffer size, too!
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