man/tip/nng_pub.7.html


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---
version: tip
layout: manpage_v2
title: nng_pub(7)
---
<h1>nng_pub(7)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_pub - publisher protocol</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><span></span><span class="tok-cp">#include</span><span class="tok-w"> </span><span class="tok-cpf">&lt;nng/protocol/pubsub0/pub.h&gt;</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>
The <em>pub</em> protocol is one half of a publisher/subscriber pattern.
In this pattern, a publisher sends data, which is broadcast to all
subscribers.
The subscribing applications only see the data to which
they have subscribed.</p>
</div>
<div class="paragraph">
<p>The <em>pub</em> protocol is the publisher side, and the
<a href="nng_sub.7.html"><em>sub</em></a> protocol is the subscriber side.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
In this implementation, the publisher delivers all messages to all
subscribers.
The subscribers maintain their own subscriptions, and filter them locally.
Thus, this pattern should not be used in an attempt to reduce bandwidth
consumption.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The topics that subscribers subscribe to is just the first part of
the message body.
Applications should construct their messages accordingly.</p>
</div>
<div class="sect2">
<h3 id="_socket_operations">Socket Operations</h3>
<div class="paragraph">
<p>The <a href="nng_pub_open.3.html"><code>nng_pub0_open()</code></a> functions create a publisher socket.
This socket may be used to send messages, but is unable to receive them.
Attempts to receive messages will result in <code>NNG_ENOTSUP</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="_protocol_versions">Protocol Versions</h3>
<div class="paragraph">
<p>Only version 0 of this protocol is supported.
(At the time of writing, no other versions of this protocol have been defined.)</p>
</div>
</div>
<div class="sect2">
<h3 id="_protocol_options">Protocol Options</h3>
<div class="paragraph">
<p>The <em>pub</em> protocol has no protocol-specific options.</p>
</div>
</div>
<div class="sect2">
<h3 id="_protocol_headers">Protocol Headers</h3>
<div class="paragraph">
<p>The <em>pub</em> protocol has no protocol-specific headers.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_pub_open.3.html">nng_pub_open(3)</a>,
<a href="nng_sub.7.html">nng_sub(7)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>