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<h1 id="things">Things</h1>
<p><a href="/v2.1/concepts/things.html">Things</a> represent the physical layer of an openHAB system.
From a configuration standpoint, Things tell openHAB which <strong>physical entities</strong> (devices, web services, information sources, etc.) are to be managed by the system.</p>
<p>Things are connected to openHAB through <a href="/v2.1/addons/bindings.html">bindings</a>.
In order to add a Thing to the system, you must first identify the appropriate binding which will provide the type of Thing you wish to add.
For example, before adding a Thing for a Z-Wave device, the Z-Wave binding must first be installed.</p>
<p>Each Thing provides one or more <strong>Channels</strong> to access its functionality.
These Channels can be linked to <a href="/v2.1/concepts/items.html">items</a>.
Items are used to control Things and consume their information.
Ultimately, when Items are linked to Channels on a Thing, they become available to the various user interfaces and to the rules engine.</p>
<p><em>Note:</em> Things are a new concept in openHAB 2, Things definitions are not needed for 1.x bindings.</p>
<h2 id="defining-things">Defining Things</h2>
<p>Things are the starting point for configuring physical entities in openHAB.
When you wish to add a new one to the system, you always start by defining a Thing.
Once a Thing has been defined and configured, you are done setting up the connection to the physical layer.
From then on, everything else is configured at the application layer for that entity.</p>
<p>From start to finish, the process for fully configuring a physical entity represented by a Thing looks like this:</p>
<ol>
<li>Identify the binding required for the Thing</li>
<li>Install the binding if it has not already been installed</li>
<li>Define and configure the Thing</li>
<li>Identify the Channels provided by the Thing</li>
<li><a href="/v2.1/configuration/items.html">Add Items</a> and link them to the Things Channels</li>
<li>At this point Items can be used to control the Thing or consume its information in e.g. <a href="/v2.1/configuration/sitemaps.html">Sitemaps</a> or <a href="/v2.1/configuration/rules-dsl.html">Rules</a></li>
</ol>
<p>There are two methods for defining Things provided by the various bindings:
through <a href="/v2.1/concepts/discovery.html">discovery</a> or by manual definition in configuration text files.</p>
<p><em>Note:</em> Some bindings do not fully support auto-discovery, others are hard to manually cover by the file based approach.
Please consult the documentation for each binding to determine the best way to add that bindings Things and Items to openHAB.
For some bindings (such as the <a href="/v2.1/addons/bindings/yahooweather/readme.html">YahooWeater</a> binding), manual Thing definitions are required.
Other bindings (such as the <a href="/v2.1/addons/bindings/zwave/readme.html">ZWave</a> binding) currently prefer or require the discovery method.</p>
<h3 id="defining-things-using-discovery">Defining Things Using Discovery</h3>
<p>Things can be added to the system using <a href="/v2.1/concepts/discovery.html">discovery</a>, which allows Things to be discovered automatically if the appropriate binding has been installed and configured.
When a Thing has been discovered, it appears in the discovery inbox.
Newly discovered Things can be added to the system from the inbox using the <a href="/v2.1/configuration/paperui.html">Paper UI</a>.</p>
<p>Things that are added to openHAB from the inbox are maintained in an internal database as opposed to a manually defined <code class="highlighter-rouge">.things</code> file (see below).
Unlike manually defined Things, if a Thing has configurable properties, these properties can be set through a user interface.</p>
<p><strong>Attention:</strong> It has to be noted, that Things and Items added through Paper UI / discovery to the internal database will <strong>not</strong> be written to configuration files.
Things and Items definitions can be distributed and mixed among the internal database and manually defined text files.</p>
<p>See the <a href="/v2.1/tutorials/beginner/configuration.html">configuration tutorial</a> for a step-by-step guide on how to configure Things using discovery.</p>
<h3 id="defining-things-using-files">Defining Things Using Files</h3>
<p>Things can also be defined manually by creating <code class="highlighter-rouge">.things</code> configuration text files.
These files are stored in the <code class="highlighter-rouge">things</code> folder under the openHAB configuration path, e.g. <code class="highlighter-rouge">/etc/openhab2/things/</code> or <code class="highlighter-rouge">openhab2/conf/things</code>.</p>
<p>Benefits of defining Things, Items and other aspects of openHAB in configuration text files are, that they are statically defined, unambiguous, flexible and easy to backup&amp;restore.
The main downsides of configuration files are the effort needed to compose them and the probability for typing errors.</p>
<p>The syntax for <code class="highlighter-rouge">.things</code> files is defined as follows (parts in <code class="highlighter-rouge">&lt;..&gt;</code> are required):</p>
<pre><code class="language-xtend">Thing &lt;binding_id&gt;:&lt;type_id&gt;:&lt;thing_id&gt; "Label" @ "Location" [ &lt;parameters&gt; ]
</code></pre>
<p><strong>Examples:</strong></p>
<pre><code class="language-xtend">Thing network:device:webcam "Webcam" @ "Living Room" [ hostname="192.168.0.2", timeout="5000", ... ]
Thing astro:moon:home [ geolocation="50.12345,10.98765", interval=300 ]
Thing ntp:ntp:local [ hostname="de.pool.ntp.org" ]
</code></pre>
<p>Looking at the first example:</p>
<ul>
<li>the binding ID is “network” (using the <a href="/v2.1/addons/bindings/network/readme.html">Network Binding</a>)</li>
<li>the type ID is “device”, indicating the Thing is a device</li>
<li>the Thing ID is “webcam”, which is an ID to uniquely identify the Thing</li>
<li>the label is “Webcam”, this is how the Thing will be named in the various user interfaces</li>
<li>the physical location of the Thing is “Living Room”</li>
<li>the values inside the <code class="highlighter-rouge">[]</code> brackets are the Things configuration parameters, these are partly mandatory and optional</li>
</ul>
<p>Please check each individual bindings <a href="/v2.1/addons/bindings.html">documentation</a> for details on what and how to define Things using the <code class="highlighter-rouge">*.things</code> configuration text files.</p>
<h3 id="linking-items">Linking Items</h3>
<p>Items can be linked to Channels of discovered or manually defined Things inside Paper UI or inside configuration files.
For more details about Item definition and usage, please refer to the <a href="/v2.1/configuration/items.html">Items configuration article</a>.</p>
<p>It is important to note, that Channels of discovered Things can also be linked to Items defined in <code class="highlighter-rouge">.items</code> files.
In order to link a Thing to an Item in an <code class="highlighter-rouge">.items</code> file, open the Thing in Paper UI under <em>Configuration → Things</em>.
In the list of Thing Channels, look for the Channel you wish to link to an Item and copy the Channels ID.
For instance, a Z-Wave switch might have a Switch Channel that has an ID like this:</p>
<pre><code class="language-xtend">zwave:device:1a2b3c4d:node2:switch_binary
</code></pre>
<p>To bind that Channel to an Item in an <code class="highlighter-rouge">.items</code> file, you can define an Item in the file like so:</p>
<pre><code class="language-xtend">Switch Kitchen_Light_Switch "Kitchen Light" (Indoor_Lights) { channel="zwave:device:1a2b3c4d:node2:switch_binary" }
</code></pre>
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