node-red/packages/node_modules/@node-red/nodes/locales/en-US/network/32-udp.html

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<script type="text/html" data-help-name="udp in">
<p>A UDP input node, that produces a <code>msg.payload</code> containing a
Buffer, string, or base64 encoded string. Supports multicast.</p>
<p>It also provides <code>msg.ip</code> and <code>msg.port</code> set to the
ip address and port from which the message was received.</p>
<p><b>Note</b>: On some systems you may need root or administrator access to use
ports below 1024 and/or broadcast.</p>
</script>
<script type="text/html" data-help-name="udp out">
<p>This node sends <code>msg.payload</code> to the designated UDP host and port. Supports multicast.</p>
<p>You may also use <code>msg.ip</code> and <code>msg.port</code> to set the destination values, but the statically configured values have precedence.</p>
<p>If you select broadcast either set the address to the local broadcast ip address, or maybe try 255.255.255.255, which is the global broadcast address.</p>
<p><b>Note</b>: On some systems you may need to be root to use ports below 1024 and/or broadcast.</p>
</script>