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  <title>Eclipse Ditto: an introduction</title>

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  <meta name="author" content="Thomas Jäckle">
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              <h1 style="line-height: 1em">
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              </h1>
              <h1 style="margin-top: 0.6em; font-size: 2em;">Eclipse Ditto:<br/>an introduction</h1>
              <h2 style="margin-top: 1.5em; font-size: 0.8em">06/2021</h2>
            </section>
        </section>

        <!-- Section: Digital Twins -->
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                     data-state="chapter-background">
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                <h1>Digital Twins</h1>
                <br/>
                <ul>
                    <li class="fragment">digital representation of real physical devices</li>
                    <li class="fragment" style="margin-top: 1em;">act as broker for communicating with assets</li>
                    <li class="fragment" style="margin-top: 1em;">applicable for both industrial and consumer-centric IoT scenarios</li>
                </ul>
            </section>
            <section id="twin-1" style="clear: both;">
                <h2>DT - our interpretation</h2>
              <br/>
                <ul>
                    <li class="fragment">a pattern for working with <b>things</b> in the IoT</li>
                  <li class="fragment" style="margin-top: 0.8em;">provide state <b>persistence</b> and <b>search</b> capabilities</li>
                  <li class="fragment" style="margin-top: 0.8em;">access twins always in an <b>authorized</b> way</li>
                  <li class="fragment" style="margin-top: 0.8em;">provide APIs - <b>Device as a Service</b></li>
                  <li class="fragment" style="margin-top: 0.8em;"><b>normalize</b> device payloads</li>
                </ul>
            </section>
        </section>

        <!-- Section: Ditto -->
        <section style="clear: both;">
            <section id="ditto-1" style="clear: both;">
                <h2>Eclipse Ditto in context</h2>
              <div style="text-align: left; float: left; width: 65%">
                <img src="../images/ditto-in-action-2020.png" style="width: 90%;padding-top:0.5em" alt="Ditto in action"/>
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              <div style="text-align: left; float: right; width: 35%">
                <p style="padding-top:3.5em">Ditto as <br/>Digital Twin<br/> "middleware"</p>
              </div>
            </section>
            <section id="ditto-2" style="clear: both;">
                <h2>turn device data into APIs</h2>
                <div style="text-align: left; float: left; width: 38%">
                <pre style="width: 100%; font-size: 0.45em;"><code class="hljs json">{
  "thingId": "io.foo:car1",
  "policyId": "io.foo:car1",
  "attributes": {
    "manufacturer": "Foo corp",
    "productionData": {
      "serialNo": 4711
    }
  },
  "features": {
    "temperature": {
      "properties": {
        "value": 23.42
      }
    }
  }
}</code></pre>
                  <p style="text-align: center">JSON repr. of a Thing</p>
                </div>
                <div style="text-align: left; float: right; width: 60%" class="fragment">
                    <pre style="width: 105%; font-size: 0.45em;"><code class="hljs">GET/PUT/DELETE /api/2/things/io.foo:car1
 /api/2/things/io.foo:car1/thingId
 /api/2/things/io.foo:car1/policyId
 /api/2/things/io.foo:car1/attributes
 /api/2/things/io.foo:car1/attributes/manufacturer
 /api/2/things/io.foo:car1/attributes/productionData
 /api/2/things/io.foo:car1/attributes/productionData/serialNo


 /api/2/things/io.foo:car1/features
 /api/2/things/io.foo:car1/features/temperature
 /api/2/things/io.foo:car1/features/temperature/properties
 /api/2/things/io.foo:car1/features/temperature/properties/value


</code></pre>
                    <a href="https://www.eclipse.org/ditto/httpapi-concepts.html#endpoints" style="float: right; font-size: 0.7em">→ docs</a>
                </div>
            </section>
            <section id="ditto-3" style="clear: both;">
                <h2>modeling thing capabilities</h2>
              <div style="text-align: left; float: left; width: 70%">
                <ul>
                  <li style="margin-top: 0.8em; font-size: 0.8em">by default, thing attributes and feature properties are "schemaless"</li>
                  <li class="fragment" data-fragment-index="1" style="margin-top: 0.8em; font-size: 0.8em">a feature may be aware of several "definitions" linking to a model</li>
                </ul>
              </div>
              <div style="text-align: left; float: right; width: 25%">
                <img src="../../images/pages/basic/ditto-thing-feature-definition-model.png" style="width: 110%" alt="Ditto thing feature definition model">
                <a href="https://www.eclipse.org/ditto/basic-feature.html#feature-definition" style="float: right; font-size: 0.7em">→ docs</a>
              </div>

              <ul style="clear: both">
                <li class="fragment" data-fragment-index="2" style="margin-top: 0.8em; font-size: 0.8em">a thing may be aware of one "definition" listing which features/aspects it provides
                </li>
              </ul>
            </section>
            <section id="ditto-4" style="clear: both;">
                <h2>persistence of device state</h2>
                <br/>
              <div style="text-align: left; float: left; width: 48%">
                <ul>
                  <li>devices are not always connected to the net</li>
                  <li class="fragment" data-fragment-index="1" style="margin-top: 1em;">applications always need to be able to access their data</li>
                  <li class="fragment" data-fragment-index="2" style="margin-top: 1em;"><b>twin</b> vs. <b>live</b> access on API level</li>
                </ul>
              </div>
              <div class="fragment" data-fragment-index="2" style="text-align: left; float: right; width: 50%">
                <img src="../../images/pages/protocol/ditto-twin-channel.png" style="width: 110%" alt="Ditto twin channel">
                <img src="../../images/pages/protocol/ditto-live-channel.png" style="width: 80%;padding-left: 1em" alt="Ditto live channel">
              </div>
            </section>
          <section id="ditto-5" style="clear: both">
            <h2>authorization</h2>
            <br/>
            <div style="text-align: left; float: left; width: 58%">
              <br/>
              <ul>
                <li>Ditto contains a built-in authorization mechanism (<b>Policies</b>)</li>
                <li class="fragment" style="margin-top: 1em;">every API call is authorized</li>
              </ul>
            </div>
            <a href="https://www.eclipse.org/ditto/basic-auth.html#authorization" style="float: right; font-size: 0.7em">→ docs</a>
          </section>
          <section id="ditto-6" style="clear: both;">
            <h2>search</h2>
            <br/>
            <div style="text-align: left; float: left; width: 40%">
              <img src="../images/meme-dino.jpg" style="width: 80%;" alt="Meme Dino" />
              <ul style="font-size: 0.7em">
                <li>you must not</li>
                <li>Ditto has you covered</li>
              </ul>
            </div>
            <div style="text-align: left; float: right; width: 60%" class="fragment" data-fragment-index="1">
                    <pre style="width: 100%; font-size: 0.45em;"><code class="hljs javascript">GET /api/2/search/things
  ?filter=like(attributes/manufacturer,"Foo*")</code></pre>
              <pre style="width: 100%; font-size: 0.45em;" class="fragment" data-fragment-index="2"><code class="hljs javascript">GET /api/2/search/things
  ?filter=and(
    exists(attributes/manufacturer),
    gt(features/temperature/properties/value,23.0)
  )
  &namespaces=io.foo
  &option=sort(-_modified,-attributes/manufacturer)
  &fields=thingId,attributes/manufacturer,_modified</code></pre>
            </div>
            <div class="fragment" data-fragment-index="2">
              <ul style="font-size: 0.7em">
                <li>search for arbitrary data with RQL query</li>
                <li>Ditto again ensures authorization</li>
                <li>apply field projection over the results</li>
                <li>don't worry about indexing</li>
              </ul>
              <a href="https://www.eclipse.org/ditto/basic-search.html" style="float: right; font-size: 0.7em">→ docs</a>
            </div>
          </section>
          <section id="ditto-7" style="clear: both;">
            <h2>get notified about changes</h2>
            <br/>
            <ul>
              <li>notification via various channels: WebSocket, SSE, MQTT (3.1.1 | 5), AMQP (0.9.1 | 1.0), Apache Kafka, HTTP hook</li>
              <li class="fragment" style="margin-top: 1em;">server side filtering via RQL (same as in search)</li>
            </ul>
            <div class="fragment">
              <a href="https://www.eclipse.org/ditto/basic-changenotifications.html" style="float: right; font-size: 0.7em">→ docs</a>
            </div>
          </section>
        </section>

      <!-- Section: Ditto + WoT -->
      <section style="clear: both;">
        <section id="ditto-wot" class="new-chapter" data-background="../bg-images/background-cloud-small.jpg"
                 data-state="chapter-background">
          <!-- background source: http://wallpapercave.com/wp/WkziiJQ.jpg -->
          <h1>Eclipse Ditto +</h1>
          <img src="../images/wot.png" alt="W3C Web of Things logo" style="width: 40%"/>
        </section>
        <section id="ditto-wot-1" style="clear: both;">
          <h2>could benefit from each other</h2>
          <br/>
          <ul>
            <li>Eclipse Ditto bringing scalable "cloud-ready" digital twin framework to the table</li>
            <li class="fragment" data-fragment-index="1" style="margin-top: 0.5em;">Ditto currently lacks modeling things</li>
            <li class="fragment" data-fragment-index="2" style="margin-top: 0.5em;">WoT "Thing Models" could be a good fit for feature "definitions"</li>
            <li class="fragment" data-fragment-index="3" style="margin-top: 0.5em;">later: WoT TD facade in Ditto?</li>
          </ul>
        </section>
      </section>

        <!-- Section: Wrap up -->
        <section style="clear: both;">
            <section id="wrap-up" style="clear: both;">
                <h1>Wrap up</h1>
                <br/>
                <ul>
                    <li>Digital Twins as pattern for simplifying IoT solution development</li>
                    <li style="margin-top: 1em;">Mission: provide Device-as-a-Service</li>
                    <li style="margin-top: 1em;">Eclipse Ditto as OpenSource framework for Digital Twins</li>
                </ul>
            </section>
        </section>

        <!-- Section: Questions and Answers -->
        <section style="clear: both;">
            <section id="q-a" class="new-chapter" data-background="../bg-images/background-conclusion-small.jpg"
                     data-state="chapter-background">
                <br/>
              <p>Links:</p>
              <ul>
                <li><a target="_blank" href="https://eclipse.org/ditto">Ditto website and documentation</a></li>
                <li><a target="_blank" href="https://github.org/eclipse/ditto">GitHub</a> - please give us a star ;)</li>
                <li><a target="_blank" href="https://gitter.im/eclipse/ditto">Chatroom to ask more questions</a></li>
                <li><a target="_blank" href="https://developer.bosch-iot-suite.com/service/things/">Commercial offering incl. free plan</a></li>
              </ul>
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