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         Component View

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     <li><a href="#top-level">Top Level</a></li>
     <li><a href="#device-registry">Device Registry</a></li>
     <li><a href="#command-router">Command Router</a></li>
     <li><a href="#amqp-10-messaging-network">AMQP 1.0 Messaging Network</a></li>
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             <h1>

               Component View
             </h1>


 <p>This page describes the high level components constituting an Eclipse Hono™ instance and their relations to each other.</p>
 <h2 id="top-level">Top Level</h2>
 <p>The diagram below provides an overview of the top level <em>logical</em> components.</p>
 <figure>
     <img src="top-level.png"/>
 </figure>

 <p>The <em>MQTT</em> and <em>HTTP Adapters</em> use the <em>Device Registry</em> to authenticate <em>Devices</em> connecting to the adapters and asserting their
 registration status. The adapters then forward the telemetry data and events received from the devices to the <em>AMQP 1.0 Messaging Network</em>
 for delivery to <em>Business Applications</em>. Business applications also use the messaging network to send commands to connected devices.
 Commands are first received by the <em>Command Router</em> and then forwarded to the protocol adapter that is connected to the respective devices.</p>
 <p>The <em>Device Registry</em> and the <em>Command Router</em> use the <em>Auth Server</em> to authenticate the protocol adapters during connection establishment.</p>
 <p>All interactions between the components are based on AMQP 1.0 message exchanges as defined by the</p>
 <ul>
 <li><a href="/hono/docs/api/credentials/">Credentials API</a>,</li>
 <li><a href="/hono/docs/api/tenant/">Tenant API</a>,</li>
 <li><a href="/hono/docs/api/device-registration/">Device Registration API</a>,</li>
 <li><a href="/hono/docs/api/command-router/">Command Router API</a>,</li>
 <li><a href="/hono/docs/api/command-and-control/">Command &amp; Control API</a>,</li>
 <li><a href="/hono/docs/api/telemetry/">Telemetry API</a> and</li>
 <li><a href="/hono/docs/api/event/">Event API</a>.</li>
 </ul>
 <h2 id="device-registry">Device Registry</h2>
 <p>The diagram below provides an overview of the <em>Device Registry</em> component&rsquo;s internal structure.</p>
 <figure>
     <img src="device-registry.png" width="100%"/>
 </figure>

 <p>The <em>Device Registry</em> component implements the <a href="/hono/docs/api/credentials/">Credentials API</a>, <a href="/hono/docs/api/tenant/">Tenant API</a>
 and <a href="/hono/docs/api/device-registration/">Device Registration API</a>.
 Clients opening a connection to the <em>DeviceRegistryServer</em> are authenticated by means of an external service accessed via the <em>Auth</em> port.</p>
 <p>Hono provides the following Device Registry implementations:</p>
 <ul>
 <li><a href="/hono/docs/user-guide/mongodb-based-device-registry/">MongoDB Based Device Registry</a></li>
 <li><a href="/hono/docs/user-guide/jdbc-based-device-registry/">JDBC Based Device Registry</a></li>
 <li><a href="/hono/docs/user-guide/file-based-device-registry/">File Based Device Registry</a></li>
 </ul>
 <h2 id="command-router">Command Router</h2>
 <p>The diagram below provides an overview of the <em>Command Router</em> component&rsquo;s internal structure.</p>
 <figure>
     <img src="command-router.png" width="100%"/>
 </figure>

 <p>The <em>Command Router</em> component implements the <a href="/hono/docs/api/command-router/">Command Router API</a>.
 Clients opening a connection to the <em>CommandRouterServer</em> are authenticated by means of an external service accessed via the <em>Auth</em> port.</p>
 <p>The <em>Command Router</em> component uses the <em>Device Registry</em> via the <a href="/hono/docs/api/tenant/">Tenant API</a> and the <a href="/hono/docs/api/device-registration/">Device Registration API</a>
 and is connected to the <em>AMQP 1.0 Messaging Network</em> to receive and forward Command &amp; Control messages as defined by the <a href="/hono/docs/api/command-and-control/">Command &amp; Control API</a>.</p>
 <h2 id="amqp-10-messaging-network">AMQP 1.0 Messaging Network</h2>
 <p>The <em>AMQP 1.0 Messaging Network</em> is not <em>per se</em> a component being developed as part of Hono. Instead, Hono comes with a default implementation of the messaging network relying on artifacts provided by other open source projects. The default implementation currently consists of a single <a href="https://qpid.apache.org">Apache Qpid Dispatch Router</a> instance connected to a single <a href="https://activemq.apache.org/artemis/">Apache Artemis</a> broker instance. Note that this setup is useful for development purposes but will probably not meet requirements regarding e.g. scalability of real world use cases.</p>
 <p>The diagram below provides an overview of the default implementation of the Messaging Network component used with Hono.</p>
 <figure>
     <img src="hono-messaging.png"/>
 </figure>

 <p>Scaling out messaging infrastructure is a not a trivial task. Hono <strong>does not</strong> provide an out-of-the-box solution to this problem but instead integrates with the <a href="https://enmasseproject.github.io">EnMasse</a> project which aims at providing <em>Messaging as a Service</em> infrastructure.</p>

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