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  <div class="section" id="console-api">
<h1>Console API<a class="headerlink" href="#console-api" title="Permalink to this headline">¶</a></h1>
<p>Any number of clients can connect to the engine via TCP/IP and communicate
with simple JSON API. The default port number is 10001 as defined by <code class="docutils literal notranslate"><span class="pre">CROWN_DEFAULT_CONSOLE_PORT</span></code>.
You can change the port number with <code class="docutils literal notranslate"><span class="pre">--console-port</span></code> option.</p>
<div class="section" id="tcp-protocol">
<h2>TCP protocol<a class="headerlink" href="#tcp-protocol" title="Permalink to this headline">¶</a></h2>
<p>Every message starts with u32 header containing the size in bytes of the
following JSON message.</p>
</div>
<div class="section" id="json-messages">
<h2>JSON messages<a class="headerlink" href="#json-messages" title="Permalink to this headline">¶</a></h2>
<p>Every JSON message has a <code class="docutils literal notranslate"><span class="pre">type</span></code> key which identifies its type.
Sending messages with unknown <code class="docutils literal notranslate"><span class="pre">type</span></code> will result with an error message:</p>
<div class="code highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
        <span class="s2">&quot;type&quot;</span> <span class="p">:</span> <span class="s2">&quot;error&quot;</span><span class="p">,</span>
        <span class="s2">&quot;message&quot;</span> <span class="p">:</span> <span class="s2">&quot;Unknown command&quot;</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="execute-lua-scripts">
<h2>Execute Lua scripts<a class="headerlink" href="#execute-lua-scripts" title="Permalink to this headline">¶</a></h2>
<p>Executing Lua script is as simple as sending the following message:</p>
<div class="code highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
        <span class="s2">&quot;type&quot;</span> <span class="p">:</span> <span class="s2">&quot;script&quot;</span><span class="p">,</span>
        <span class="s2">&quot;script&quot;</span> <span class="p">:</span> <span class="s2">&quot;print(&#39;Hello, world!&#39;)&quot;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>All the tools are controlled by sending simple Lua scripts to them.</p>
</div>
</div>


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