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<title> Ditto's connectivity capabilities are pimped up </title>
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<article class="post" itemscope itemtype="http://schema.org/BlogPosting">
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<h1 class="post-title" itemprop="name headline">Ditto's connectivity capabilities are pimped up</h1>
<p class="post-meta">Published by <img src="https://www.gravatar.com/avatar/19a9fd49b6778aef898249fb4f11bd24?s=135" alt="A photo of Thomas Jäckle" style="width:50px;border-radius:50%;display:inline-block;margin-right:5px;" /><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name"><a href="http://twitter.com/thjaeckle" target="_blank">Thomas Jäckle</a> </span></span> on <time datetime="2018-04-25T00:00:00+00:00" itemprop="datePublished">Apr 25, 2018</time> - Tags:
<a href="tag_blog.html">blog</a>,
<a href="tag_connectivity.html">connectivity</a>
</p>
</header>
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<p>It has been quite lately on our website and on GitHub as the Ditto team currently prepares its new <code class="highlighter-rouge">connectivity</code>
microservice. Until now Ditto’s <code class="highlighter-rouge">amqp-bridge</code> service could connect to AMQP1.0 endpoints
(e.g. <a href="https://www.eclipse.org/hono/">Eclipse Hono</a>).</p>
<p>That worked quite well, but still had some issues:</p>
<ul>
<li>failover/reconnection was not always done properly</li>
<li>the current connection state could not yet be retrieved</li>
<li>AMQP 1.0 is a great protocol including <a href="https://www.reactivemanifesto.org">reactive principles</a> but it still is not very “mainstream”</li>
<li>the AMQP 1.0 messages consumed by Ditto already had to be in <a href="protocol-overview.html">Ditto Protocol</a>, otherwise Ditto
could not understand them</li>
</ul>
<p>Our current implementation focus lies on two GitHub issues resolving those problems:</p>
<ul>
<li><a href="https://github.com/eclipse/ditto/issues/129">Enhance existing AMQP-bridge with AMQP 0.9.1 connectivity</a></li>
<li><a href="https://github.com/eclipse/ditto/issues/130">Support mapping arbitrary message payloads in AMQP-bridge</a></li>
</ul>
<h2 id="changes-and-enhancements">Changes and Enhancements</h2>
<h3 id="renaming">Renaming</h3>
<p>With the new responsibilities of the former amqp-bridge we have renamed the <code class="highlighter-rouge">amqp-bridge-service</code> to <code class="highlighter-rouge">connectivity-service</code>. <br />
The Docker image and the Maven artifacts are affected by this change.</p>
<h3 id="enhanced-connectivity">Enhanced connectivity</h3>
<p>The new <a href="architecture-services-connectivity.html">connectivity</a> microservice can now manage and handle both AMQP 1.0 and
AMQP 0.9.1 connections at the same time. <br />
That means that Ditto from now on supports connecting to running AMQP 1.0 endpoints or to AMQP 0.9.1 brokers (e.g. RabbitMQ).
The architecture of the <code class="highlighter-rouge">connectivity</code> microservice is designed to also support connecting via other protocols in the future.</p>
<p>Need to connect to a Kafka in order to process digital twin <a href="basic-signals-command.html">commands</a> from there or publish
<a href="basic-changenotifications.html">change notifications</a>? <br />
Or want to send all state changes happening to twins to a time series database?</p>
<p>The <code class="highlighter-rouge">connectivity</code> service is the new place to integrate your managed digital twins with other systems.</p>
<h3 id="json-format-of-connections">JSON format of connections</h3>
<p>As Ditto now supports more than AMQP 1.0, we had to adjust the JSON format for creating new connections.
The new one is documented here: <a href="connectivity-manage-connections.html">Manage connections in connectivity</a>.</p>
<h3 id="payload-mapping-of-external-messages">Payload mapping of external messages</h3>
<p>Eclipse Ditto is about providing access to IoT devices via the <a href="intro-digitaltwins.html">digital twin</a> pattern. In order to
provide structured APIs for different heterogeneous devices Ditto defines a lightweight JSON based <a href="basic-overview.html">model</a>.</p>
<p>Devices in the IoT, may they be brownfield devices or newly produced devices, will probably not send their data to the
cloud in the structure and <a href="protocol-overview.html">protocol</a> Ditto requires. They should not need to be aware of something
like Ditto running in the cloud mirroring them as digital twins.</p>
<p>That’s why we added a JavaScript based payload mapping to the <code class="highlighter-rouge">connectivity</code> service which is responsible for:</p>
<ul>
<li>transforming text- or byte-payload from messages consumed via a <code class="highlighter-rouge">source</code> of a created connection to
<a href="protocol-overview.html">Ditto Protocol</a> <a href="basic-signals-command.html">commands</a> and <a href="basic-messages.html">messages</a></li>
<li>transforming back <a href="basic-signals-commandresponse.html">responses</a> issued by commands and <a href="basic-signals-event.html">events</a>
from Ditto Protocol to some text- or byte-payload before sending the message back via the configured <code class="highlighter-rouge">target</code> channel</li>
</ul>
<p>The <code class="highlighter-rouge">incoming</code> and <code class="highlighter-rouge">outgoing</code> scripts must be configured when creating a new connection
<a href="connectivity-manage-connections.html">via DevOps commands</a>.</p>
<h2 id="example">Example</h2>
<p>Please find more information and examples at:</p>
<ul>
<li><a href="connectivity-overview.html">Connectivity overview</a></li>
<li><a href="connectivity-mapping.html">Payload mapping in connectivity</a></li>
</ul>
<p><br />
<br /></p>
<figure><img class="docimage" src="images/ditto.svg" alt="Ditto" style="max-width: 500px" /></figure>
<p><br />
The Eclipse Ditto team</p>
</div>
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