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<h1 class="post-title-main">Thing</h1>
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<p>The versatile assets in IoT applications can be managed as Things.</p>
<h2 id="thing">Thing</h2>
<p>Things are very generic entities and are mostly used as a “handle” for multiple features belonging to this Thing.</p>
<p>Examples:</p>
<ul>
<li>Physical Device: a lawn mower, a sensor, a vehicle, a lamp.</li>
<li>Virtual Device: a room in a house, a virtual power plant spanning multiple power plants, the weather information for
a specific location collected by various sensors.</li>
<li>Transactional entity: a tour of a vehicle (from start until stop), a series of measurements of a machine.</li>
<li>Master data entity: a supplier of devices or a service provider for devices, an entity representing a city/region.</li>
<li>Anything else - if it can be modeled and managed appropriately by the supported concepts/capabilities.</li>
</ul>
<h3 id="thing-id">Thing ID</h3>
<p>Unique identifier of a Thing. For choosing custom Thing IDs when creating a Thing, the rules for
<a href="basic-namespaces-and-names.html#namespaced-id">namespaced IDs</a> apply.</p>
<h3 id="access-control">Access control</h3>
<p>A Thing in API version 1 contains an inline <a href="basic-acl.html">ACL</a> defining which authenticated parties may READ, WRITE
and ADMINISTRATE the <code class="highlighter-rouge">Thing</code>. (Please note that ACL’s are part of deprecated API 1)</p>
<p>A Thing in API version 2 does no longer contain the <a href="#" data-toggle="tooltip" data-original-title="An access control list (ACL) holds the current status on who (subject) is permitted to which extent (read, write, administrate) to manage a Thing.">ACL</a>.
Instead it contains a link to a <a href="basic-policy.html">Policy</a> in form of a <code class="highlighter-rouge">policyId</code>. This
<a href="#" data-toggle="tooltip" data-original-title="A Policy enables developers to configure fine-grained access control in an easy way. A specific policy defines who (subject) is granted or revoked permissions (rights) on a specific resource. The resource can be defined as rough or as fine-grained as necessary for the respective use case. ">Policy</a> defines which
authenticated subjects may READ and WRITE the Thing or even parts of it (hierarchically specified).</p>
<h3 id="definition">Definition</h3>
<p>A Thing may contain a definition. The definition can also be used to find Things. The definition is used to link a thing
to a corresponding model defining the capabilities/features of it, e.g. via an
<a href="https://www.eclipse.org/vorto/">Eclipse Vorto</a> “information model”.</p>
<h3 id="attributes">Attributes</h3>
<p>Attributes describe the Thing in more detail and can be of any type. Attributes can also be used to find Things.
Attributes are typically used to model rather static properties at the Thing level. Static means that the values do not
change as frequently as property values of Features.</p>
<h3 id="features">Features</h3>
<p>A Thing may contain an arbitrary amount of <a href="basic-feature.html">Features</a>.</p>
<figure><img class="docimage" src="images/pages/basic/ditto-thing-feature.png" alt="Thing and Feature" style="max-width: 100px" /><figcaption>One Thing can have
many Features</figcaption></figure>
<h3 id="model-specification">Model specification</h3>
<h4 id="api-version-1---deprecated">API version 1 - Deprecated</h4>
<script src="docson/widget.js" data-schema="../jsonschema/thing_v1.json"></script>
<h4 id="api-version-2">API version 2</h4>
<script src="docson/widget.js" data-schema="../jsonschema/thing_v2.json"></script>
<h3 id="example-api-version-2">Example (API version 2)</h3>
<div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w">
</span><span class="s2">"thingId"</span><span class="p">:</span><span class="w"> </span><span class="s2">"the.namespace:theId"</span><span class="p">,</span><span class="w">
</span><span class="s2">"policyId"</span><span class="p">:</span><span class="w"> </span><span class="s2">"the.namespace:thePolicyId"</span><span class="p">,</span><span class="w">
</span><span class="s2">"definition"</span><span class="p">:</span><span class="w"> </span><span class="s2">"org.eclipse.ditto:HeatingDevice:2.1.0"</span><span class="p">,</span><span class="w">
</span><span class="s2">"attributes"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"someAttr"</span><span class="p">:</span><span class="w"> </span><span class="mi">32</span><span class="p">,</span><span class="w">
</span><span class="s2">"manufacturer"</span><span class="p">:</span><span class="w"> </span><span class="s2">"ACME corp"</span><span class="w">
</span><span class="p">},</span><span class="w">
</span><span class="s2">"features"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"heating-no1"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"connected"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w">
</span><span class="s2">"complexProperty"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"street"</span><span class="p">:</span><span class="w"> </span><span class="s2">"my street"</span><span class="p">,</span><span class="w">
</span><span class="s2">"house no"</span><span class="p">:</span><span class="w"> </span><span class="mi">42</span><span class="w">
</span><span class="p">}</span><span class="w">
</span><span class="p">}</span><span class="w">
</span><span class="p">},</span><span class="w">
</span><span class="s2">"switchable"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"definition"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> </span><span class="s2">"org.eclipse.ditto:Switcher:1.0.0"</span><span class="w"> </span><span class="p">],</span><span class="w">
</span><span class="s2">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="s2">"on"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w">
</span><span class="s2">"lastToggled"</span><span class="p">:</span><span class="w"> </span><span class="s2">"2017-11-15T18:21Z"</span><span class="w">
</span><span class="p">}</span><span class="w">
</span><span class="p">}</span><span class="w">
</span><span class="p">}</span><span class="w">
</span><span class="p">}</span><span class="w">
</span></code></pre></div></div>
<div class="tags">
<b>Tags: </b>
<a href="tag_model.html" class="btn btn-default navbar-btn cursorNorm" role="button">model</a>
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