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Copy file name to clipboardExpand all lines: snapshot/core_concepts-1.html
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<codeclass="inline">datetime("2022-06-27T16:27:40.254795Z")</code>.</li><li><codeclass="inline">binaryblob("<base64 encoded value>")</code> is used to pass <codeclass="inline">binaryblob</code> values in expressions. The
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string contained in double quotes must be a valid Base64 encoding of the binary value. Example:
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<codeclass="inline">binaryblob("Zm9vYmFy")</code> to encode the string <codeclass="inline">"foobar"</code>.</li></ul><h5>Attribute inclusion filter*</h5><p>*<em>This feature is planned for a future release</em></p><ul><li><codeclass="inline">"<value>" in attributes["<namespace>:<key>"]</code>: returns <codeclass="inline">true</code> if <codeclass="inline">value</code> is included in the
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chosen attribute. Note that the attribute must be an array for the expression to be valid.</li></ul><h4>Examples</h4><p>To provide some examples, here is a Selector to target all out of order Devices in Milan:</p><pre><codeclass="makeup elixir" translate="no"><spanclass="s">"out-of-order"</span><spanclass="w"></span><spanclass="ow">in</span><spanclass="w"></span><spanclass="n">tags</span><spanclass="w"></span><spanclass="ow">and</span><spanclass="w"></span><spanclass="n">attributes</span><spanclass="p" data-group-id="6493844409-1">[</span><spanclass="s">"edgehog-synthetic:city"</span><spanclass="p" data-group-id="6493844409-1">]</span><spanclass="w"></span><spanclass="o">==</span><spanclass="w"></span><spanclass="s">"Milan"</span></code></pre><p>Here is a selector to target all Devices that have their service timestamp in the past so they have
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chosen attribute. Note that the attribute must be an array for the expression to be valid.</li></ul><h4>Examples</h4><p>To provide some examples, here is a Selector to target all out of order Devices in Milan:</p><pre><codeclass="makeup elixir" translate="no"><spanclass="s">"out-of-order"</span><spanclass="w"></span><spanclass="ow">in</span><spanclass="w"></span><spanclass="n">tags</span><spanclass="w"></span><spanclass="ow">and</span><spanclass="w"></span><spanclass="n">attributes</span><spanclass="p" data-group-id="7095756725-1">[</span><spanclass="s">"edgehog-synthetic:city"</span><spanclass="p" data-group-id="7095756725-1">]</span><spanclass="w"></span><spanclass="o">==</span><spanclass="w"></span><spanclass="s">"Milan"</span></code></pre><p>Here is a selector to target all Devices that have their service timestamp in the past so they have
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to be serviced, imagining this information is contained in the <codeclass="inline">com.foo.ServiceInfo</code> Astarte
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interface in the <codeclass="inline">/serviceTimestamp</code>:</p><pre><codeclass="makeup elixir" translate="no"><spanclass="n">attributes</span><spanclass="p" data-group-id="9774763228-1">[</span><spanclass="s">"astarte-values:com.foo.ServiceInfo/serviceTimestamp"</span><spanclass="p" data-group-id="9774763228-1">]</span><spanclass="w"></span><spanclass="o"><=</span><spanclass="w"></span><spanclass="n">now</span><spanclass="p" data-group-id="9774763228-2">(</span><spanclass="p" data-group-id="9774763228-2">)</span></code></pre><h4>Caveats</h4><p>Note that numeric values are conflated in a single numeric type, i.e. a selector with
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interface in the <codeclass="inline">/serviceTimestamp</code>:</p><pre><codeclass="makeup elixir" translate="no"><spanclass="n">attributes</span><spanclass="p" data-group-id="4408338601-1">[</span><spanclass="s">"astarte-values:com.foo.ServiceInfo/serviceTimestamp"</span><spanclass="p" data-group-id="4408338601-1">]</span><spanclass="w"></span><spanclass="o"><=</span><spanclass="w"></span><spanclass="n">now</span><spanclass="p" data-group-id="4408338601-2">(</span><spanclass="p" data-group-id="4408338601-2">)</span></code></pre><h4>Caveats</h4><p>Note that numeric values are conflated in a single numeric type, i.e. a selector with
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<codeclass="inline">attributes["custom:foo"] == 42</code> will match either if <codeclass="inline">foo</code> is <codeclass="inline">integer</code>, <codeclass="inline">longinteger</code> or <codeclass="inline">double</code>
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(e.g it will also match <codeclass="inline">42.0</code>).</p><p>Another important thing to notice is that using an Attribute Filter will implicitly match only
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Devices that have that attribute. As an example, if there are 3 devices, one with attribute <codeclass="inline">foo:bar == 42</code>, the other with attribute <codeclass="inline">foo:bar == 3</code> and the third one with no <codeclass="inline">foo:bar</code> attribute, the
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<p>This page illustrates the core concepts of Edgehog's container management system.</p><h2id="images" class="section-heading"><ahref="#images" class="hover-link"><iclass="ri-link-m" aria-hidden="true"></i></a><spanclass="text">Images</span></h2><p>Images in Edgehog are not managed directly by the platform. Instead, Edgehog treats images as external references that are passed to the device’s container runtime (such as Docker or Podman). Edgehog does not store, pull or validate images, it simply records the image reference string provided in a container definition.</p><h3id="image-reference-format" class="section-heading"><ahref="#image-reference-format" class="hover-link"><iclass="ri-link-m" aria-hidden="true"></i></a><spanclass="text">Image Reference Format</span></h3><p>The image reference represents the name of the image to pull.
</span><spanclass="p" data-group-id="9477549289-3">}</span><spanclass="p" data-group-id="9477549289-2">)</span></code></pre><p>Values to be replaced</p><ul><li><codeclass="inline">TENANT-NAME</code>: the name of the new tenant.</li><li><codeclass="inline">TENANT-SLUG</code>: the slug of the tenant, must contain only lowercase letters and hyphens.</li><li><codeclass="inline">TENANT-PUBLIC-KEY</code>: the content of <codeclass="inline">tenant_public.pem</code> created in the <ahref="#creating-a-keypair">previous
</span><spanclass="p" data-group-id="8259702638-3">}</span><spanclass="p" data-group-id="8259702638-2">)</span></code></pre><p>Values to be replaced</p><ul><li><codeclass="inline">TENANT-NAME</code>: the name of the new tenant.</li><li><codeclass="inline">TENANT-SLUG</code>: the slug of the tenant, must contain only lowercase letters and hyphens.</li><li><codeclass="inline">TENANT-PUBLIC-KEY</code>: the content of <codeclass="inline">tenant_public.pem</code> created in the <ahref="#creating-a-keypair">previous
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step</a>. Open a multiline string with <codeclass="inline">"""</code>, press Enter, paste the content of
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the file in the <codeclass="inline">iex</code> shell and then close the multiline string with <codeclass="inline">"""</code> on a new line.</li><li><codeclass="inline">ASTARTE-BASE-API-URL</code>: the base API url of the Astarte instance (e.g.
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<ahref="https://api.astarte.example.com">https://api.astarte.example.com</a>).</li><li><codeclass="inline">ASTARTE-REALM-NAME</code>: the name of the Astarte realm you're using.</li><li><codeclass="inline">ASTARTE-REALM-PRIVATE-KEY</code>: the content of the Astarte realm's private key. Open a multiline string with
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