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<title>Eclipse Ditto Blog</title>
<description>Announcements, tutorials and examples around Eclipse Ditto and Digital Twins</description>
<link>https://www.eclipse.org/ditto/</link>
<atom:link href="https://www.eclipse.org/ditto/feed.xml" rel="self" type="application/rss+xml"/>
<pubDate>Tue, 17 Dec 2019 04:56:04 -0500</pubDate>
<lastBuildDate>Tue, 17 Dec 2019 04:56:04 -0500</lastBuildDate>
<generator>Jekyll v3.6.2</generator>
<item>
<title>Announcing Eclipse Ditto Release 1.0.0</title>
<description>&lt;p&gt;Today the Eclipse Ditto is thrilled to announce the availability of Eclipse Ditto’s first major release
&lt;a href=&quot;https://projects.eclipse.org/projects/iot.ditto/releases/1.0.0&quot;&gt;1.0.0&lt;/a&gt;.&lt;/p&gt;
&lt;h2 id=&quot;maturity&quot;&gt;Maturity&lt;/h2&gt;
&lt;p&gt;The initial code contribution was done in October 2017, 2 years later and 2 releases
(&lt;a href=&quot;2018-11-28-release-announcement-080.html&quot;&gt;0.8.0&lt;/a&gt; and &lt;a href=&quot;2019-07-10-release-announcement-090.html&quot;&gt;0.9.0&lt;/a&gt;) later, we
think its time to graduate from the Eclipse “incubation” phase and officially declare the project as mature.&lt;/p&gt;
&lt;p&gt;Recent adoptions and contributions from our community show us that Eclipse Ditto solves problems which also other
companies have. Adopters add Eclipse Ditto as a central part of their own IoT platforms.&lt;/p&gt;
&lt;h3 id=&quot;api-stability&quot;&gt;API stability&lt;/h3&gt;
&lt;p&gt;Having reached 1.0.0, some additional promises towards “API stability” do apply:&lt;/p&gt;
&lt;h4 id=&quot;http-api-stability&quot;&gt;HTTP API stability&lt;/h4&gt;
&lt;p&gt;Ditto uses schema versioning (currently schema version 1 and 2) at the HTTP API level in order to being able to
evolve APIs.
It is backward compatible to the prior versions 0.8.0 and 0.9.0.&lt;/p&gt;
&lt;h4 id=&quot;json-api-stability&quot;&gt;JSON API stability&lt;/h4&gt;
&lt;p&gt;Ditto kept its main JSON APIs (regarding things, policies and search) backwards compatible to 0.8.0 and 0.9.0 releases.
The JSON format of “connections” was changed since 0.9.0 and will from 1.0.0 on be kept backwards compatible as well.&lt;/p&gt;
&lt;h4 id=&quot;java-api-stability&quot;&gt;Java API stability&lt;/h4&gt;
&lt;p&gt;The Java APIs will for the 1.x release be kept backwards compatible, so only non-breaking additions to the APIs will be done. This is enforced by a Maven tooling.&lt;/p&gt;
&lt;p&gt;The following Java modules are treated as API for which compatibility is enforced:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;ditto-json&lt;/li&gt;
&lt;li&gt;ditto-model-*&lt;/li&gt;
&lt;li&gt;ditto-signals-*&lt;/li&gt;
&lt;li&gt;ditto-protocol-adapter&lt;/li&gt;
&lt;li&gt;ditto-utils&lt;/li&gt;
&lt;li&gt;ditto-client&lt;/li&gt;
&lt;/ul&gt;
&lt;h3 id=&quot;scalability&quot;&gt;Scalability&lt;/h3&gt;
&lt;p&gt;The focus on the 0.9.0 and 1.0.0 releases regarding non-functionals were laid on horizontal scalability.&lt;/p&gt;
&lt;p&gt;With Eclipse Ditto 1.0.0 we are confident to face production grade scalability requirements being capable of handling
millions of managed things.&lt;/p&gt;
&lt;h2 id=&quot;changelog&quot;&gt;Changelog&lt;/h2&gt;
&lt;p&gt;The main changes compared to the last release, &lt;a href=&quot;release_notes_090.html&quot;&gt;0.9.0&lt;/a&gt;, are:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;addition of a Java and a JavaScript client SDK in separate &lt;a href=&quot;https://github.com/eclipse/ditto-clients&quot;&gt;GitHub repo&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;configurable OpenID Connect authorization servers&lt;/li&gt;
&lt;li&gt;support for OpenID Connect / OAuth2.0 based authentication in Ditto Java Client&lt;/li&gt;
&lt;li&gt;invoking custom foreign HTTP endpoints as a result of events/messages&lt;/li&gt;
&lt;li&gt;ability to reflect Eclipse Hono’s device connection state in Ditto’s things&lt;/li&gt;
&lt;li&gt;configurable throttling of max. consumed WebSocket commands / time interval&lt;/li&gt;
&lt;li&gt;Addition of “definition” field in thing at model level containing the model ID a thing may follow&lt;/li&gt;
&lt;li&gt;Improved connection response handling/mapping&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;Please have a look at the &lt;a href=&quot;release_notes_100.html&quot;&gt;1.0.0 release notes&lt;/a&gt; for a more detailed information on the release.&lt;/p&gt;
&lt;h2 id=&quot;artifacts&quot;&gt;Artifacts&lt;/h2&gt;
&lt;p&gt;The new Java artifacts have been published at the &lt;a href=&quot;https://repo.eclipse.org/content/repositories/ditto/&quot;&gt;Eclipse Maven repository&lt;/a&gt;
as well as &lt;a href=&quot;https://repo1.maven.org/maven2/org/eclipse/ditto/&quot;&gt;Maven central&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The Docker images have been pushed to Docker Hub:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-policies/&quot;&gt;eclipse/ditto-policies&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things/&quot;&gt;eclipse/ditto-things&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things-search/&quot;&gt;eclipse/ditto-things-search&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-gateway/&quot;&gt;eclipse/ditto-gateway&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-connectivity/&quot;&gt;eclipse/ditto-connectivity&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-concierge/&quot;&gt;eclipse/ditto-concierge&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Thu, 12 Dec 2019 00:00:00 -0500</pubDate>
<link>https://www.eclipse.org/ditto/2019-12-12-release-announcement-100.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-12-12-release-announcement-100.html</guid>
<category>blog</category>
</item>
<item>
<title>Announcing Ditto Milestone 1.0.0-M2</title>
<description>&lt;p&gt;The second and last milestone of the upcoming release
&lt;a href=&quot;https://projects.eclipse.org/projects/iot.ditto/releases/1.0.0&quot;&gt;1.0.0&lt;/a&gt; was released today.&lt;/p&gt;
&lt;p&gt;Have a look at the Milestone &lt;a href=&quot;release_notes_100-M2.html&quot;&gt;1.0.0-M2 release notes&lt;/a&gt; for what changed in detail.&lt;/p&gt;
&lt;p&gt;The main changes and new features since the last release &lt;a href=&quot;release_notes_100-M1a.html&quot;&gt;1.0.0-M1a release notes&lt;/a&gt; are&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;invoking custom foreign HTTP endpoints as a result of events/messages&lt;/li&gt;
&lt;li&gt;ability to reflect Eclipse Hono’s device connection state in Ditto’s things&lt;/li&gt;
&lt;li&gt;support for OpenID Connect / OAuth2.0 based authentication in Ditto Java Client&lt;/li&gt;
&lt;li&gt;configurbale throttling of max. consumed WebSocket commands / time interval&lt;/li&gt;
&lt;/ul&gt;
&lt;h2 id=&quot;artifacts&quot;&gt;Artifacts&lt;/h2&gt;
&lt;p&gt;The new Java artifacts have been published at the &lt;a href=&quot;https://repo.eclipse.org/content/repositories/ditto/&quot;&gt;Eclipse Maven repository&lt;/a&gt;
as well as &lt;a href=&quot;https://repo1.maven.org/maven2/org/eclipse/ditto/&quot;&gt;Maven central&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The Docker images have been pushed to Docker Hub:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-policies/&quot;&gt;eclipse/ditto-policies&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things/&quot;&gt;eclipse/ditto-things&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things-search/&quot;&gt;eclipse/ditto-things-search&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-gateway/&quot;&gt;eclipse/ditto-gateway&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-connectivity/&quot;&gt;eclipse/ditto-connectivity&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-concierge/&quot;&gt;eclipse/ditto-concierge&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Mon, 04 Nov 2019 00:00:00 -0500</pubDate>
<link>https://www.eclipse.org/ditto/2019-11-04-milestone-announcement-100-M2.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-11-04-milestone-announcement-100-M2.html</guid>
<category>blog</category>
</item>
<item>
<title>Integration of HTTP endpoints/webhooks</title>
<description>&lt;p&gt;By adding another connectivity type - &lt;a href=&quot;connectivity-protocol-bindings-http.html&quot;&gt;HTTP&lt;/a&gt; - to Ditto’s
connectivity, it is now (to be released in the next Ditto milestone 1.0.0-M2) possible to to
publish &lt;em&gt;twin events&lt;/em&gt;, &lt;em&gt;messages&lt;/em&gt;, &lt;em&gt;live commands and events&lt;/em&gt; to existing HTTP servers/endpoints.&lt;/p&gt;
&lt;p&gt;That is especially useful for invoking existing APIs (which are most of the time HTTP based) whenever e.g.
a digital twin was modified.&lt;/p&gt;
&lt;p&gt;One example on how to benefit from this new feature is to invoke a custom
&lt;a href=&quot;https://ifttt.com&quot;&gt;IFTTT&lt;/a&gt; (if-this-than-that) &lt;a href=&quot;https://ifttt.com/maker_webhooks&quot;&gt;webhook&lt;/a&gt; via a HTTP &lt;code class=&quot;highlighter-rouge&quot;&gt;POST&lt;/code&gt; request
which then may trigger other IFTTT follow-up-actions (e.g. send a chat message to a &lt;a href=&quot;https://ifttt.com/slack&quot;&gt;Slack&lt;/a&gt;
room).&lt;/p&gt;
&lt;p&gt;For IFTTT “webhooks” the address would be &lt;code class=&quot;highlighter-rouge&quot;&gt;POST https://maker.ifttt.com/trigger/&amp;lt;your-event-name&amp;gt;/with/key/&amp;lt;your-key&amp;gt;&lt;/code&gt;
and the expected JSON body:&lt;/p&gt;
&lt;div class=&quot;language-json highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;value1&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;:&lt;/span&gt;&lt;span class=&quot;w&quot;&gt; &lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;...&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;value2&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;:&lt;/span&gt;&lt;span class=&quot;w&quot;&gt; &lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;...&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;value3&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;:&lt;/span&gt;&lt;span class=&quot;w&quot;&gt; &lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;...&quot;&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;In combination with &lt;a href=&quot;connectivity-mapping.html&quot;&gt;payload mapping&lt;/a&gt;, the &lt;code class=&quot;highlighter-rouge&quot;&gt;value1&lt;/code&gt; to &lt;code class=&quot;highlighter-rouge&quot;&gt;value3&lt;/code&gt; fields requested by the IFTTT
API can be extracted from the &lt;a href=&quot;protocol-specification.html&quot;&gt;Ditto Protocol&lt;/a&gt; and could contain the changed value.&lt;/p&gt;
&lt;p&gt;In combination with &lt;a href=&quot;basic-connections.html#target-topics-and-filtering&quot;&gt;filters for targets&lt;/a&gt; you can even specify to
only publish e.g. &lt;code class=&quot;highlighter-rouge&quot;&gt;twin events&lt;/code&gt;, where the temperature of a twin exceeded a certain threshold:&lt;/p&gt;
&lt;div class=&quot;highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;{
&quot;address&quot;: &quot;POST:/trigger/&amp;lt;your-event-name&amp;gt;/with/key/&amp;lt;your-key&amp;gt;&quot;,
&quot;topics&quot;: [
&quot;_/_/things/twin/events?filter=gt(features/temperature/value,25)&quot;
],
...
}
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;Get creative on which HTTP APIs to trigger based on twin events. E.g. invoke a “function-as-a-service” API or invoke the
Twitter API and let your digital twin tweet whenever it detects, that it is getting too warm in your office.&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Thu, 17 Oct 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-10-17-http-connectivity.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-10-17-http-connectivity.html</guid>
<category>blog</category>
</item>
<item>
<title>Announcing Ditto Milestone 1.0.0-M1a</title>
<description>&lt;p&gt;Today the Ditto team is happy to announce the first milestone of the upcoming release
&lt;a href=&quot;https://projects.eclipse.org/projects/iot.ditto/releases/1.0.0&quot;&gt;1.0.0&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;Have a look at the Milestone &lt;a href=&quot;release_notes_100-M1a.html&quot;&gt;1.0.0-M1a release notes&lt;/a&gt; for what changed in detail.&lt;/p&gt;
&lt;p&gt;The main changes and new features since the last release &lt;a href=&quot;release_notes_090.html&quot;&gt;0.9.0&lt;/a&gt; are&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;initial contribution of Java client SDK&lt;/li&gt;
&lt;li&gt;configurable OpenID Connect authorization servers&lt;/li&gt;
&lt;li&gt;fine grained access for connections&lt;/li&gt;
&lt;li&gt;scalable event publishing&lt;/li&gt;
&lt;li&gt;typed entity IDs&lt;/li&gt;
&lt;/ul&gt;
&lt;h2 id=&quot;artifacts&quot;&gt;Artifacts&lt;/h2&gt;
&lt;p&gt;The new Java artifacts have been published at the &lt;a href=&quot;https://repo.eclipse.org/content/repositories/ditto/&quot;&gt;Eclipse Maven repository&lt;/a&gt;
as well as &lt;a href=&quot;https://repo1.maven.org/maven2/org/eclipse/ditto/&quot;&gt;Maven central&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The Docker images have been pushed to Docker Hub:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-policies/&quot;&gt;eclipse/ditto-policies&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things/&quot;&gt;eclipse/ditto-things&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things-search/&quot;&gt;eclipse/ditto-things-search&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-gateway/&quot;&gt;eclipse/ditto-gateway&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-connectivity/&quot;&gt;eclipse/ditto-connectivity&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-concierge/&quot;&gt;eclipse/ditto-concierge&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Tue, 17 Sep 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-09-17-milestone-announcement-100-M1a.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-09-17-milestone-announcement-100-M1a.html</guid>
<category>blog</category>
</item>
<item>
<title>Eclipse Ditto now supports OpenID Connect</title>
<description>&lt;p&gt;Eclipse Ditto now supports all OAuth 2.0 providers which implement &lt;a href=&quot;https://openid.net/connect/&quot;&gt;OpenID Connect&lt;/a&gt; out-of-the-box.
You can find a list of certified providers at &lt;a href=&quot;https://openid.net/developers/certified/&quot;&gt;OpenID Connect - Certified OpenID Provider Servers and Services&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;With this post, we want to give an example of this new feature using the open source provider &lt;a href=&quot;https://www.ory.sh&quot;&gt;ORY Hydra&lt;/a&gt;.
Follow their &lt;a href=&quot;https://www.ory.sh/docs/next/hydra/configure-deploy#installing-ory-hydra&quot;&gt;installation guide&lt;/a&gt; for a
docker based setup on your development machine.&lt;/p&gt;
&lt;h4 id=&quot;configuration&quot;&gt;Configuration&lt;/h4&gt;
&lt;p&gt;Download the self-signed certificate form the ORY Hydra server: https://localhost:9000/.well-known/openid-configuration&lt;/p&gt;
&lt;p&gt;Use the downloaded certificate for the akka-http ssl configuration.&lt;/p&gt;
&lt;pre&gt;&lt;code class=&quot;language-hocon&quot;&gt;ssl-config {
trustManager = {
stores = [
{ type = &quot;PEM&quot;, path = &quot;/path/to/cert/globalsign.crt&quot; }
]
}
}
&lt;/code&gt;&lt;/pre&gt;
&lt;p&gt;The authentication provider must be added to the ditto-gateway configuration.&lt;/p&gt;
&lt;pre&gt;&lt;code class=&quot;language-hocon&quot;&gt;ditto.gateway.authentication {
oauth {
openid-connect-issuers = {
ory = &quot;https://localhost:9000/&quot;
}
}
}
&lt;/code&gt;&lt;/pre&gt;
&lt;p&gt;The configured subject-issuer will be used to prefix the value of the “sub” claim, e.g.&lt;/p&gt;
&lt;div class=&quot;language-json highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;subjects&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;:&lt;/span&gt;&lt;span class=&quot;w&quot;&gt; &lt;/span&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;ory:foo@bar.com&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;:&lt;/span&gt;&lt;span class=&quot;w&quot;&gt; &lt;/span&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;type&quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;:&lt;/span&gt;&lt;span class=&quot;w&quot;&gt; &lt;/span&gt;&lt;span class=&quot;s2&quot;&gt;&quot;generated&quot;&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;&lt;span class=&quot;w&quot;&gt;
&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4 id=&quot;authenticate-ditto-api&quot;&gt;Authenticate Ditto API&lt;/h4&gt;
&lt;p&gt;Create an OAuth client with hydra to be able to create ID Tokens.&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;docker run &lt;span class=&quot;nt&quot;&gt;--rm&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-it&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-e&lt;/span&gt; &lt;span class=&quot;nv&quot;&gt;HYDRA_ADMIN_URL&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;https://ory-hydra-example--hydra:4445 &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--network&lt;/span&gt; hydraguide &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
oryd/hydra:v1.0.0 &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
clients create &lt;span class=&quot;nt&quot;&gt;--skip-tls-verify&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--id&lt;/span&gt; eclipse-ditto &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--secret&lt;/span&gt; some-secret &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--grant-types&lt;/span&gt; authorization_code,refresh_token,client_credentials,implicit &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--response-types&lt;/span&gt; token,code,id_token &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--scope&lt;/span&gt; openid,offline &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--callbacks&lt;/span&gt; http://127.0.0.1:9010/callback
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;Use the client to generate an ID Token.&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;docker run &lt;span class=&quot;nt&quot;&gt;--rm&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-it&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--network&lt;/span&gt; hydraguide &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-p&lt;/span&gt; 9010:9010 &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
oryd/hydra:v1.0.0 &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
token user &lt;span class=&quot;nt&quot;&gt;--skip-tls-verify&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--port&lt;/span&gt; 9010 &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--auth-url&lt;/span&gt; https://localhost:9000/oauth2/auth &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--token-url&lt;/span&gt; https://ory-hydra-example--hydra:4444/oauth2/token &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--client-id&lt;/span&gt; eclipse-ditto &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--client-secret&lt;/span&gt; some-secret &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;--scope&lt;/span&gt; openid
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;After that perform the OAuth 2.0 Authorize Code Flow by opening the link, as prompted,
in your browser, and follow the steps shown there.&lt;/p&gt;
&lt;p&gt;Use the generated token to authenticate Ditto API.&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
http://localhost:8080/api/2/things &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Authorization: Bearer &amp;lt;JWT&amp;gt;'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{}'&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Wed, 28 Aug 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-08-28-openid-connect.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-08-28-openid-connect.html</guid>
<category>blog</category>
</item>
<item>
<title>Announcing Eclipse Ditto Release 0.9.0</title>
<description>&lt;p&gt;Today the Eclipse Ditto team proudly presents its second release
&lt;a href=&quot;https://projects.eclipse.org/projects/iot.ditto/releases/0.9.0&quot;&gt;0.9.0&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The topics of this release in a nutshell were:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;Memory improvements for huge amounts (multi million) of digital twins which are held in memory&lt;/li&gt;
&lt;li&gt;Adding metrics and logging around the connectivity feature in order to enable being able to operate connections to foreign systems/brokers via APIs&lt;/li&gt;
&lt;li&gt;Enhancing Ditto’s connectivity feature by additionally being able to connect to Apache Kafka&lt;/li&gt;
&lt;li&gt;Performance improvements of Ditto’s search functionality&lt;/li&gt;
&lt;li&gt;Stabilization of cluster bootstrapping&lt;/li&gt;
&lt;li&gt;Refactoring of how the services configurations are determined&lt;/li&gt;
&lt;li&gt;Addition of a Helm template in order to simplify Kubernetes based deployments&lt;/li&gt;
&lt;li&gt;Contributions from Microsoft in order to ease operating Eclipse Ditto on Microsoft Azure&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;Please have a look at the &lt;a href=&quot;release_notes_090.html&quot;&gt;0.9.0 release notes&lt;/a&gt; for a more detailed information on the release.&lt;/p&gt;
&lt;h2 id=&quot;artifacts&quot;&gt;Artifacts&lt;/h2&gt;
&lt;p&gt;The new Java artifacts have been published at the &lt;a href=&quot;https://repo.eclipse.org/content/repositories/ditto/&quot;&gt;Eclipse Maven repository&lt;/a&gt;
as well as &lt;a href=&quot;https://repo1.maven.org/maven2/org/eclipse/ditto/&quot;&gt;Maven central&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The Docker images have been pushed to Docker Hub:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-policies/&quot;&gt;eclipse/ditto-policies&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things/&quot;&gt;eclipse/ditto-things&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things-search/&quot;&gt;eclipse/ditto-things-search&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-gateway/&quot;&gt;eclipse/ditto-gateway&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-connectivity/&quot;&gt;eclipse/ditto-connectivity&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-concierge/&quot;&gt;eclipse/ditto-concierge&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Wed, 10 Jul 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-07-10-release-announcement-090.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-07-10-release-announcement-090.html</guid>
<category>blog</category>
</item>
<item>
<title>Announcing Ditto Milestone 0.9.0-M2</title>
<description>&lt;p&gt;The second milestone of the upcoming release
&lt;a href=&quot;https://projects.eclipse.org/projects/iot.ditto/releases/0.9.0&quot;&gt;0.9.0&lt;/a&gt; was released today.&lt;/p&gt;
&lt;p&gt;Have a look at the Milestone &lt;a href=&quot;release_notes_090-M2.html&quot;&gt;0.9.0-M2 release notes&lt;/a&gt; for what changed in detail.&lt;/p&gt;
&lt;p&gt;The main changes and new features since the last milestone &lt;a href=&quot;release_notes_090-M1.html&quot;&gt;0.9.0-M1&lt;/a&gt; are&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;rewrite of Ditto’s “search” service in order to use the same index and have the same query performance for API v1 and v2&lt;/li&gt;
&lt;li&gt;several contributions in order to operate Eclipse Ditto on Microsoft Azure&lt;/li&gt;
&lt;/ul&gt;
&lt;h2 id=&quot;artifacts&quot;&gt;Artifacts&lt;/h2&gt;
&lt;p&gt;The new Java artifacts have been published at the &lt;a href=&quot;https://repo.eclipse.org/content/repositories/ditto/&quot;&gt;Eclipse Maven repository&lt;/a&gt;
as well as &lt;a href=&quot;https://repo1.maven.org/maven2/org/eclipse/ditto/&quot;&gt;Maven central&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The Docker images have been pushed to Docker Hub:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-policies/&quot;&gt;eclipse/ditto-policies&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things/&quot;&gt;eclipse/ditto-things&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things-search/&quot;&gt;eclipse/ditto-things-search&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-gateway/&quot;&gt;eclipse/ditto-gateway&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-connectivity/&quot;&gt;eclipse/ditto-connectivity&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-concierge/&quot;&gt;eclipse/ditto-concierge&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Mon, 29 Apr 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-04-29-milestone-announcement-090-M2.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-04-29-milestone-announcement-090-M2.html</guid>
<category>blog</category>
</item>
<item>
<title>Announcing Ditto Milestone 0.9.0-M1</title>
<description>&lt;p&gt;Today the Ditto team is happy to announce the first milestone of the upcoming release
&lt;a href=&quot;https://projects.eclipse.org/projects/iot.ditto/releases/0.9.0&quot;&gt;0.9.0&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;Have a look at the Milestone &lt;a href=&quot;release_notes_090-M1.html&quot;&gt;0.9.0-M1 release notes&lt;/a&gt; for what changed in detail.&lt;/p&gt;
&lt;p&gt;The main changes and new features since the last release &lt;a href=&quot;release_notes_080.html&quot;&gt;0.8.0&lt;/a&gt; are&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;memory optimizations when working with millions of digital twins&lt;/li&gt;
&lt;li&gt;enhance connectivity to also be able to establish connections to Apache Kafka&lt;/li&gt;
&lt;li&gt;providing more detailed metrics for connections&lt;/li&gt;
&lt;li&gt;cluster bootstrapping stability improvements&lt;/li&gt;
&lt;/ul&gt;
&lt;h2 id=&quot;artifacts&quot;&gt;Artifacts&lt;/h2&gt;
&lt;p&gt;The new Java artifacts have been published at the &lt;a href=&quot;https://repo.eclipse.org/content/repositories/ditto/&quot;&gt;Eclipse Maven repository&lt;/a&gt;
as well as &lt;a href=&quot;https://repo1.maven.org/maven2/org/eclipse/ditto/&quot;&gt;Maven central&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;The Docker images have been pushed to Docker Hub:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-policies/&quot;&gt;eclipse/ditto-policies&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things/&quot;&gt;eclipse/ditto-things&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-things-search/&quot;&gt;eclipse/ditto-things-search&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-gateway/&quot;&gt;eclipse/ditto-gateway&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-connectivity/&quot;&gt;eclipse/ditto-connectivity&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&quot;https://hub.docker.com/r/eclipse/ditto-concierge/&quot;&gt;eclipse/ditto-concierge&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;br /&gt;
&lt;br /&gt;&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Thu, 28 Mar 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-03-28-milestone-announcement-090-M1.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-03-28-milestone-announcement-090-M1.html</guid>
<category>blog</category>
</item>
<item>
<title>Connectivity to Apache Kafka in Eclipse Ditto</title>
<description>&lt;p&gt;Today we added connectivity to &lt;a href=&quot;https://kafka.apache.org/&quot;&gt;Apache Kafka&lt;/a&gt;. In a first step, it is possible to publish
&lt;em&gt;twin events&lt;/em&gt;, &lt;em&gt;messages&lt;/em&gt;, &lt;em&gt;live commands and events&lt;/em&gt; to Kafka topics.&lt;/p&gt;
&lt;p&gt;Since the last addition to Ditto’s connectivity which &lt;a href=&quot;2018-10-16-example-mqtt-bidirectional.html&quot;&gt;added MQTT connectivity&lt;/a&gt;,
the connectivity feature got a lot of stabilization and new smaller features, e.g. the recent addition of
&lt;a href=&quot;basic-placeholders.html#function-expressions&quot;&gt;placeholder functions&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;Returning to the Kafka integration Ditto can now, for example, whenever a &lt;a href=&quot;intro-digitaltwins.html&quot;&gt;digital twin&lt;/a&gt; is
changed (e.g. a device updated some state data), publish a &lt;em&gt;twin event&lt;/em&gt; to a Kafka topic.&lt;/p&gt;
&lt;p&gt;If you already rely on Apache Kafka as a source for your data lake or analytics, integrating Ditto and its digital twins
is now super easy.&lt;/p&gt;
&lt;p&gt;Find out more at our &lt;a href=&quot;connectivity-protocol-bindings-kafka2.html&quot;&gt;Kafka documentation&lt;/a&gt;.&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Wed, 13 Mar 2019 00:00:00 -0400</pubDate>
<link>https://www.eclipse.org/ditto/2019-03-13-kafka-connectivity.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2019-03-13-kafka-connectivity.html</guid>
<category>blog</category>
</item>
<item>
<title>Using Eclipse Hono's Command&amp;Control with Eclipse Ditto</title>
<description>&lt;p&gt;With &lt;a href=&quot;release_notes_080.html&quot;&gt;version 0.8.0&lt;/a&gt; Eclipse Ditto can now interact with Eclipse Hono using the
“Command &amp;amp; Control” feature. It is possible to send a
Thing (or Feature) message at the Ditto Message API, which is then forwarded to Hono as a
command message. Hono routes the message to the device, which in turn can send a response to the command including a
status, telling if the command was successfully processed or not.
This response is routed back via Hono to the Ditto Message API.&lt;/p&gt;
&lt;p&gt;In this example we connect the &lt;a href=&quot;https://ditto.eclipse.org/&quot;&gt;Ditto sandbox&lt;/a&gt; and the
&lt;a href=&quot;https://www.eclipse.org/hono/sandbox/&quot;&gt;Hono sandbox&lt;/a&gt; to send a message (3) to a simulated device via the
Ditto Messages API. The device receives the command from the Hono HTTP Adapter and responds with a message (4)
that is routed back to the caller at the Ditto Message API (5). For the sake of simplicity we use simple curl
commands both for the Ditto and Hono HTTP APIs.&lt;/p&gt;
&lt;p&gt;The following steps are covered in this example:&lt;/p&gt;
&lt;ol&gt;
&lt;li&gt;Setup a connection between Eclipse Ditto and Hono sandboxes&lt;/li&gt;
&lt;li&gt;Signal availability of the device&lt;/li&gt;
&lt;li&gt;Send a Ditto message&lt;/li&gt;
&lt;li&gt;Device receives command and sends command response&lt;/li&gt;
&lt;li&gt;Caller receives response at Ditto Message API&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;&lt;img src=&quot;images/blog/2018-12-14-command-and-control.png&quot; alt=&quot;Command and Control&quot; /&gt;&lt;/p&gt;
&lt;h3 id=&quot;prerequisites-a-ditto-digital-twin-and-a-hono-device&quot;&gt;Prerequisites: A Ditto digital twin and a Hono device&lt;/h3&gt;
&lt;p&gt;The creation of a Hono device and Ditto digital twin has already been covered in the blog post
&lt;a href=&quot;2018-05-02-connecting-ditto-hono.html&quot;&gt;Connecting Eclipse Ditto to Eclipse Hono&lt;/a&gt;. For brevity we will just list the
required commands to create a twin/device here. For a detailed explanation of the steps please refer to the previous
post.&lt;/p&gt;
&lt;h4 id=&quot;create-hono-device&quot;&gt;Create Hono device&lt;/h4&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;c&quot;&gt;# setup a tenant&lt;/span&gt;
&lt;span class=&quot;nv&quot;&gt;$ &lt;/span&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{&quot;tenant-id&quot;: &quot;org.eclipse.ditto&quot;}'&lt;/span&gt; http://hono.eclipse.org:28080/tenant
&lt;span class=&quot;c&quot;&gt;# create a device&lt;/span&gt;
&lt;span class=&quot;nv&quot;&gt;$ &lt;/span&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{&quot;device-id&quot;: &quot;org.eclipse.ditto:teapot&quot;}'&lt;/span&gt; http://hono.eclipse.org:28080/registration/org.eclipse.ditto
&lt;span class=&quot;c&quot;&gt;# add device credentials&lt;/span&gt;
&lt;span class=&quot;nv&quot;&gt;$ PWD_HASH&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;&lt;span class=&quot;k&quot;&gt;$(&lt;/span&gt;&lt;span class=&quot;nb&quot;&gt;echo&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-n&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'teapot'&lt;/span&gt; | openssl dgst &lt;span class=&quot;nt&quot;&gt;-binary&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-sha512&lt;/span&gt; | base64 &lt;span class=&quot;nt&quot;&gt;-w&lt;/span&gt; 0&lt;span class=&quot;k&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;nv&quot;&gt;$ &lt;/span&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;device-id&quot;: &quot;org.eclipse.ditto:teapot&quot;,
&quot;type&quot;: &quot;hashed-password&quot;,
&quot;auth-id&quot;: &quot;teapot&quot;,
&quot;secrets&quot;: [{
&quot;hash-function&quot; : &quot;sha-512&quot;,
&quot;pwd-hash&quot;: &quot;'&lt;/span&gt;&lt;span class=&quot;nv&quot;&gt;$PWD_HASH&lt;/span&gt;&lt;span class=&quot;s1&quot;&gt;'&quot;
}]
}'&lt;/span&gt; http://hono.eclipse.org:28080/credentials/org.eclipse.ditto
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4 id=&quot;create-ditto-policy-for-digital-twin&quot;&gt;Create Ditto policy for digital twin&lt;/h4&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;c&quot;&gt;# create policy in Ditto&lt;/span&gt;
&lt;span class=&quot;nv&quot;&gt;$ &lt;/span&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; PUT &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; demo5:demo &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;policyId&quot;: &quot;org.eclipse.ditto:teapot-policy&quot;,
&quot;entries&quot;: {
&quot;DEMO&quot;: {
&quot;subjects&quot;: {
&quot;nginx:demo5&quot;: {
&quot;type&quot;: &quot;basic auth user and user used in connection'&lt;/span&gt;s authorizationContext&lt;span class=&quot;s2&quot;&gt;&quot;
}
},
&quot;&lt;/span&gt;resources&lt;span class=&quot;s2&quot;&gt;&quot;: {
&quot;&lt;/span&gt;thing:/&lt;span class=&quot;s2&quot;&gt;&quot;: {
&quot;&lt;/span&gt;grant&lt;span class=&quot;s2&quot;&gt;&quot;: [&quot;&lt;/span&gt;READ&lt;span class=&quot;s2&quot;&gt;&quot;, &quot;&lt;/span&gt;WRITE&lt;span class=&quot;s2&quot;&gt;&quot;],
&quot;&lt;/span&gt;revoke&lt;span class=&quot;s2&quot;&gt;&quot;: []
},
&quot;&lt;/span&gt;policy:/&lt;span class=&quot;s2&quot;&gt;&quot;: {
&quot;&lt;/span&gt;grant&lt;span class=&quot;s2&quot;&gt;&quot;: [&quot;&lt;/span&gt;READ&lt;span class=&quot;s2&quot;&gt;&quot;, &quot;&lt;/span&gt;WRITE&lt;span class=&quot;s2&quot;&gt;&quot;],
&quot;&lt;/span&gt;revoke&lt;span class=&quot;s2&quot;&gt;&quot;: []
},
&quot;&lt;/span&gt;message:/&lt;span class=&quot;s2&quot;&gt;&quot;: {
&quot;&lt;/span&gt;grant&lt;span class=&quot;s2&quot;&gt;&quot;: [&quot;&lt;/span&gt;READ&lt;span class=&quot;s2&quot;&gt;&quot;, &quot;&lt;/span&gt;WRITE&lt;span class=&quot;s2&quot;&gt;&quot;],
&quot;&lt;/span&gt;revoke&lt;span class=&quot;s2&quot;&gt;&quot;: []
}
}
}
}
}' https://ditto.eclipse.org/api/2/policies/org.eclipse.ditto:teapot-policy
&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4 id=&quot;create-ditto-digital-twin&quot;&gt;Create Ditto digital twin&lt;/h4&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;c&quot;&gt;# create thing in Ditto&lt;/span&gt;
&lt;span class=&quot;nv&quot;&gt;$ &lt;/span&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; PUT &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; demo5:demo &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;policyId&quot;: &quot;org.eclipse.ditto:teapot-policy&quot;,
&quot;features&quot;: {
&quot;water&quot;: {
&quot;properties&quot;: {
&quot;temperature&quot;: 20
}
}
}
}'&lt;/span&gt; https://ditto.eclipse.org/api/2/things/org.eclipse.ditto:teapot
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h3 id=&quot;setup-a-connection-for-command--control&quot;&gt;Setup a connection for Command &amp;amp; Control&lt;/h3&gt;
&lt;p&gt;In order to forward Ditto Messages to the device as a Hono command we first need to setup and configure a
&lt;a href=&quot;connectivity-manage-connections.html&quot;&gt;connection&lt;/a&gt; between Eclipse Ditto and Eclipse Hono that is prepared for
&lt;em&gt;Command &amp;amp; Control&lt;/em&gt; messages. According to the
&lt;a href=&quot;https://www.eclipse.org/hono/&quot;&gt;Hono documentation&lt;/a&gt;
the connection must contain a target with the address &lt;code class=&quot;highlighter-rouge&quot;&gt;control/&amp;lt;tenant-id&amp;gt;/&amp;lt;device-id&amp;gt;&lt;/code&gt;
and a source with the address &lt;code class=&quot;highlighter-rouge&quot;&gt;control/&amp;lt;tenant-id&amp;gt;/&amp;lt;reply-identifier&amp;gt;&lt;/code&gt;. The &lt;code class=&quot;highlighter-rouge&quot;&gt;reply-identifier&lt;/code&gt; can be
chosen arbitrarily, but must be set as the &lt;code class=&quot;highlighter-rouge&quot;&gt;reply-to&lt;/code&gt; header of a command exactly as defined in the connection:&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; devops:devopsPw1! &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;targetActorSelection&quot;: &quot;/system/sharding/connection&quot;,
&quot;headers&quot;: {
&quot;aggregate&quot;: false
},
&quot;piggybackCommand&quot;: {
&quot;type&quot;: &quot;connectivity.commands:createConnection&quot;,
&quot;connection&quot;: {
&quot;id&quot;: &quot;command-and-control-connection&quot;,
&quot;connectionType&quot;: &quot;amqp-10&quot;,
&quot;connectionStatus&quot;: &quot;open&quot;,
&quot;uri&quot;: &quot;amqp://consumer%40HONO:verysecret@hono.eclipse.org:15672&quot;,
&quot;failoverEnabled&quot;: true,
&quot;sources&quot;: [{
&quot;addresses&quot;: [
&quot;control/org.eclipse.ditto/replies&quot;
],
&quot;authorizationContext&quot;: [
&quot;nginx:demo5&quot;
],
&quot;headerMapping&quot;: {
&quot;correlation-id&quot;: &quot;{{ header:correlation-id }}&quot;,
&quot;status&quot;: &quot;{{ header:status }}&quot;,
&quot;content-type&quot;: &quot;{{ header:content-type }}&quot;
}
}
],
&quot;targets&quot;: [{
&quot;address&quot;: &quot;control/org.eclipse.ditto/{{ thing:name }}&quot;,
&quot;authorizationContext&quot;: [
&quot;nginx:demo5&quot;
],
&quot;topics&quot;:[&quot;_/_/things/live/messages&quot;],
&quot;headerMapping&quot;: {
&quot;message-id&quot;: &quot;{{ header:correlation-id }}&quot;,
&quot;subject&quot;: &quot;{{ topic:subject }}&quot;,
&quot;content-type&quot;: &quot;application/vnd.eclipse.ditto+json&quot;,
&quot;reply-to&quot;: &quot;control/org.eclipse.ditto/replies&quot;
}
}
]
}
}
}'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
https://ditto.eclipse.org/devops/piggyback/connectivity?timeout&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;10000
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;As described in the
&lt;a href=&quot;https://www.eclipse.org/hono/&quot;&gt;Hono API description&lt;/a&gt;
a command message has three mandatory properties: &lt;code class=&quot;highlighter-rouge&quot;&gt;correlation-id&lt;/code&gt;, &lt;code class=&quot;highlighter-rouge&quot;&gt;subject&lt;/code&gt; and &lt;code class=&quot;highlighter-rouge&quot;&gt;reply-to&lt;/code&gt;, these are defined in the
target header mapping of the connection.
The source header mapping defines a mapping for &lt;code class=&quot;highlighter-rouge&quot;&gt;correlation-id&lt;/code&gt; and &lt;code class=&quot;highlighter-rouge&quot;&gt;status&lt;/code&gt; to internal headers, they are required
to properly map the Hono command response to a Ditto message response.&lt;/p&gt;
&lt;h3 id=&quot;signal-availability-of-device&quot;&gt;Signal availability of device&lt;/h3&gt;
&lt;p&gt;As we are using the Hono HTTP Adapter to connect our device, send telemetry and receive commands, the designated way
is therefor to signal readiness to receive a command by specifying the &lt;code class=&quot;highlighter-rouge&quot;&gt;hono-ttd&lt;/code&gt; parameter on an arbitrary event (for
detailed description please consult the
[Hono HTTP Adapter] (https://www.eclipse.org/hono/)
guide).&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;curl &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; teapot@org.eclipse.ditto:teapot &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'hono-ttd: 60'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;topic&quot;: &quot;org.eclipse.ditto/teapot/things/twin/commands/modify&quot;,
&quot;path&quot;: &quot;/features/water/properties/temperature&quot;,
&quot;value&quot;: 23
}'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
http://hono.eclipse.org:8080/telemetry
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;The request is now open to receive a command for 60 seconds before it is terminated.&lt;/p&gt;
&lt;h3 id=&quot;send-a-ditto-message&quot;&gt;Send a Ditto message&lt;/h3&gt;
&lt;p&gt;Now we can use the &lt;a href=&quot;protocol-specification-things-messages.html#using-the-messages-api&quot;&gt;Ditto Messages API&lt;/a&gt; to send a
message to the device waiting for a command:&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;curl &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;s1&quot;&gt;'https://ditto.eclipse.org/api/2/things/org.eclipse.ditto:teapot/inbox/messages/brew?timeout=60'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; demo5:demo &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'x-correlation-id: command-and-control'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{&quot;targetTemperature&quot;:85}'&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h3 id=&quot;device-receives-the-command&quot;&gt;Device receives the command&lt;/h3&gt;
&lt;p&gt;The message is forwarded to Hono as configured in the connection and finally terminates the pending request we opened
before with a status code of &lt;code class=&quot;highlighter-rouge&quot;&gt;200 OK&lt;/code&gt;:&lt;/p&gt;
&lt;div class=&quot;highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;HTTP/1.1 200 OK
hono-command: brew
hono-cmd-req-id: 013command-and-controlreplies
Content-Type: application/octet-stream
Content-Length: 17
Connection: Keep-Alive
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;Hono adds two headers besides the standard HTTP headers: &lt;code class=&quot;highlighter-rouge&quot;&gt;hono-command&lt;/code&gt; and &lt;code class=&quot;highlighter-rouge&quot;&gt;hono-cmd-req-id&lt;/code&gt;.
&lt;code class=&quot;highlighter-rouge&quot;&gt;hono-command&lt;/code&gt; contains the subject of the message and &lt;code class=&quot;highlighter-rouge&quot;&gt;hono-cmd-req-id&lt;/code&gt; identifies the messages and is used to
correlate the request and the response we are now going to send.&lt;/p&gt;
&lt;h3 id=&quot;device-sends-a-command-response&quot;&gt;Device sends a command response&lt;/h3&gt;
&lt;p&gt;We use the header value of &lt;code class=&quot;highlighter-rouge&quot;&gt;hono-cmd-req-id&lt;/code&gt; to construct the response address:
&lt;code class=&quot;highlighter-rouge&quot;&gt;http://hono.eclipse.org:8080/control/res/013command-and-controlreplies&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;Another curl command completes the roundtrip with a response from the simulated device:&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;curl &lt;span class=&quot;nt&quot;&gt;-i&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-X&lt;/span&gt; POST &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; teapot@org.eclipse.ditto:teapot &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'Content-Type: application/json'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-H&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'hono-cmd-status: 200'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;topic&quot;: &quot;org.eclipse.ditto/teapot/things/live/messages/brew&quot;,
&quot;headers&quot;: {
&quot;content-type&quot;: &quot;application/json&quot;,
&quot;correlation-id&quot;: &quot;command-and-control&quot;
},
&quot;path&quot;: &quot;/inbox/messages/brew&quot;,
&quot;value&quot;: { &quot;eta&quot;: 56},
&quot;status&quot;: 200
}'&lt;/span&gt; &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
http://hono.eclipse.org:8080/control/res/013command-and-controlreplies
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h3 id=&quot;message-response-is-received-at-ditto-message-api&quot;&gt;Message response is received at Ditto Message API&lt;/h3&gt;
&lt;p&gt;And finally we receive the command response at the Ditto Message API where we sent the original message:&lt;/p&gt;
&lt;div class=&quot;highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;HTTP/1.1 200 OK
correlation-id: command-and-control
message-id: command-and-control
status: 200
Content-Type: application/json
Content-Length: 10
{&quot;eta&quot;:56}
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h3 id=&quot;alternative-receive-command-and-send-response-via-mqtt&quot;&gt;Alternative: Receive command and send response via MQTT&lt;/h3&gt;
&lt;p&gt;Alternatively we can also receive the command by subscribing to the MQTT topic &lt;code class=&quot;highlighter-rouge&quot;&gt;control/+/+/req/#&lt;/code&gt; at the
&lt;a href=&quot;https://www.eclipse.org/hono/&quot;&gt;Hono MQTT Adapter&lt;/a&gt;:&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;nv&quot;&gt;$ &lt;/span&gt;mosquitto_sub &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-h&lt;/span&gt; hono.eclipse.org &lt;span class=&quot;nt&quot;&gt;-p&lt;/span&gt; 8883 &lt;span class=&quot;nt&quot;&gt;-v&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'teapot@org.eclipse.ditto'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-P&lt;/span&gt; teapot &lt;span class=&quot;nt&quot;&gt;-t&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'control/+/+/req/#'&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;And also publish the command response on the MQTT topic &lt;code class=&quot;highlighter-rouge&quot;&gt;control///res/013command-and-controlreplies/200&lt;/code&gt;:&lt;/p&gt;
&lt;div class=&quot;language-bash highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;mosquitto_pub &lt;span class=&quot;nt&quot;&gt;-d&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-h&lt;/span&gt; hono.eclipse.org &lt;span class=&quot;nt&quot;&gt;-p&lt;/span&gt; 8883 &lt;span class=&quot;nt&quot;&gt;-u&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'teapot@org.eclipse.ditto'&lt;/span&gt; &lt;span class=&quot;nt&quot;&gt;-P&lt;/span&gt; teapot &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-t&lt;/span&gt; control///res/013command-and-controlreplies/200 &lt;span class=&quot;se&quot;&gt;\&lt;/span&gt;
&lt;span class=&quot;nt&quot;&gt;-m&lt;/span&gt; &lt;span class=&quot;s1&quot;&gt;'{
&quot;topic&quot;: &quot;org.eclipse.ditto/teapot/things/live/messages/brew&quot;,
&quot;headers&quot;: {
&quot;content-type&quot;: &quot;application/json&quot;,
&quot;correlation-id&quot;: &quot;command-and-control&quot;
},
&quot;path&quot;: &quot;/inbox/messages/brew&quot;,
&quot;value&quot;: {
&quot;eta&quot;: 58
},
&quot;status&quot;: 200
}'&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;If you have any wishes, improvements, are missing something
or just want to get in touch with us, you can use one of
our &lt;a href=&quot;feedback.html&quot;&gt;feedback channels&lt;/a&gt;.&lt;/p&gt;
&lt;figure&gt;&lt;img class=&quot;docimage&quot; src=&quot;images/ditto.svg&quot; alt=&quot;Ditto&quot; style=&quot;max-width: 500px&quot; /&gt;&lt;/figure&gt;
&lt;p&gt;–&lt;br /&gt;
The Eclipse Ditto team&lt;/p&gt;
</description>
<pubDate>Wed, 05 Dec 2018 00:00:00 -0500</pubDate>
<link>https://www.eclipse.org/ditto/2018-12-05-example-command-and-control.html</link>
<guid isPermaLink="true">https://www.eclipse.org/ditto/2018-12-05-example-command-and-control.html</guid>
<category>blog</category>
</item>
</channel>
</rss>