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<li><a href="protocol-examples-creatething.html">Create a Thing</a></li>
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<li><a href="protocol-examples-createproperties.html">Create Feature Properties</a></li>
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<li><a href="protocol-examples-createproperty.html">Create a single Property</a></li>
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<li><a href="protocol-examples-retrieveproperty.html">Retrieve a single Property</a></li>
<li><a href="protocol-examples-createdesiredproperties.html">Create desired Feature Properties</a></li>
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<li><a href="protocol-examples-modifydesiredproperties.html">Modify desired Feature Properties</a></li>
<li><a href="protocol-examples-retrievedesiredproperties.html">Retrieve desired Feature Properties</a></li>
<li><a href="protocol-examples-createdesiredproperty.html">Create a single desired Property</a></li>
<li><a href="protocol-examples-deletedesiredproperty.html">Delete a single desired Property</a></li>
<li><a href="protocol-examples-modifydesiredproperty.html">Modify a single desired Property</a></li>
<li><a href="protocol-examples-retrievedesiredproperty.html">Retrieve a single desired Property</a></li>
<li><a href="protocol-examples-errorresponses.html">Error responses</a></li>
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<a href="#"><span></span>→ Things merge examples</a>
<ul>
<li><a href="protocol-examples-mergething.html">Merge a Thing</a></li>
<li><a href="protocol-examples-mergepolicyid.html">Merge the Policy ID of a Thing</a></li>
<li><a href="protocol-examples-mergeattributes.html">Merge Attributes</a></li>
<li><a href="protocol-examples-mergeattribute.html">Merge a single Attribute</a></li>
<li><a href="protocol-examples-mergethingdefinition.html">Merge a Definition</a></li>
<li><a href="protocol-examples-mergefeatures.html">Merge Features</a></li>
<li><a href="protocol-examples-mergefeature.html">Merge a single Feature</a></li>
<li><a href="protocol-examples-mergefeaturedefinition.html">Merge Feature Definition</a></li>
<li><a href="protocol-examples-mergeproperties.html">Merge Feature Properties</a></li>
<li><a href="protocol-examples-mergeproperty.html">Merge a single Property</a></li>
<li><a href="protocol-examples-mergedesiredproperties.html">Merge desired Feature Properties</a></li>
<li><a href="protocol-examples-mergedesiredproperty.html">Merge a single desired Property</a></li>
<li><a href="protocol-examples-errorresponses.html">Error responses</a></li>
</ul>
</li>
<li class="subfolders">
<a href="#"><span></span>→ Policies examples</a>
<ul>
<li><a href="protocol-examples-policies-createpolicy.html">Create a Policy</a></li>
<li><a href="protocol-examples-policies-deletepolicy.html">Delete a Policy</a></li>
<li><a href="protocol-examples-policies-modifypolicy.html">Modify a Policy</a></li>
<li><a href="protocol-examples-policies-retrievepolicy.html">Retrieve a Policy</a></li>
<li><a href="protocol-examples-policies-modifypolicyentries.html">Modify entries</a></li>
<li><a href="protocol-examples-policies-retrievepolicyentries.html">Retrieve entries</a></li>
<li><a href="protocol-examples-policies-createpolicyentry.html">Create a single entry</a></li>
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<h1 class="post-title-main">Release notes 1.5.0</h1>
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<div class="summary">Version 1.5.0 of Eclipse Ditto, released on 10.12.2020</div>
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<p>Ditto <strong>1.5.0</strong> is API and <a href="https://github.com/eclipse/ditto/blob/master/documentation/src/main/resources/architecture/DADR-0005-semantic-versioning.md">binary compatible</a>
to prior Eclipse Ditto 1.x versions.</p>
<h2 id="changelog">Changelog</h2>
<p>Compared to the latest release <a href="release_notes_140.html">1.4.0</a>, the following changes, new features and
bugfixes were added.</p>
<div class="alert alert-danger" role="alert"><i class="fa fa-exclamation-circle"></i> <b>Warning:</b> If you want to upgrade an existing Ditto installation to 1.5.0, the migration has to be
done before upgrading: <strong>Follow the steps documented in <a href="#migration-notes">the migration notes</a></strong>.</div>
<h3 id="changes">Changes</h3>
<h4 id="negatively-settling-processed-amqp-10-messages-changed-to-rejected"><a href="https://github.com/eclipse/ditto/pull/907">Negatively settling processed AMQP 1.0 messages changed to <code class="highlighter-rouge">rejected</code></a></h4>
<p>In previous versions, Ditto negatively settled messages consumed via AMQP 1.0 which could not be applied to Ditto
(e.g. because the received message could not be understood or permissions were missing) with <code class="highlighter-rouge">modified[undeliverable-here]</code>.</p>
<p>This was changed to settle with <code class="highlighter-rouge">rejected</code>
(see <a href="http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-messaging-v1.0-os.html#type-rejected">AMQP 1.0 spec</a>)
instead, as this is the more correct settlement outcome.</p>
<h4 id="mongodb-for-unit-tests-was-increased-to-version-42"><a href="https://github.com/eclipse/ditto/pull/896">MongoDB for unit tests was increased to version 4.2</a></h4>
<p>Prior to Ditto 1.5.0, the unit tests still were done against MongoDB version 3.6 which reaches end-of-life in April 2021.</p>
<h4 id="config-files-consolidation"><a href="https://github.com/eclipse/ditto/pull/888">Config files consolidation</a></h4>
<p>No special <code class="highlighter-rouge">-cloud.conf</code> and <code class="highlighter-rouge">-docker.conf</code> config files are needed any longer, there are only special config files
ending with <code class="highlighter-rouge">-dev.conf</code> which contain configuration in order to start Eclipse Ditto e.g. locally in an IDE.</p>
<h3 id="new-features">New features</h3>
<h4 id="header-mapping-for-feature-id-in-connectivity"><a href="https://github.com/eclipse/ditto/issues/857">Header mapping for Feature ID in connectivity</a></h4>
<p>Feature IDs may now be used as placeholders in <a href="basic-placeholders.html#scope-connections">Connectivity header mappings</a>.</p>
<h4 id="addition-of-desired-feature-properties-in-model-and-apis"><a href="https://github.com/eclipse/ditto/issues/697">Addition of “desired” feature properties in model and APIs</a></h4>
<p>A feature which was long on the roadmap of Eclipse Ditto is the ability to distinguish between reported and <a href="basic-feature.html#feature-desired-properties">desired
twin state</a>.</p>
<p>“reported” twin state can be seen as data/state coming from the actual device (the current “truth”) whereas the
“desired” state is something an application in the backend or a mobile app would set as the new requested target state
for a property.</p>
<p>This issue layed the foundation by creating the model and the APIs in order to manage those <code class="highlighter-rouge">desiredProperties</code>.</p>
<h4 id="issuing-weak-acknowledgements-when-a-command-requesting-acks-was-filtered-out"><a href="https://github.com/eclipse/ditto/issues/852">Issuing “weak acknowledgements” when a command requesting acks was filtered out</a></h4>
<p>When using <a href="basic-acknowledgements.html">acknowledgements</a> in order to guarantee “at least once” (QoS 1) delivery and
scenarios like:</p>
<ul>
<li>a subscriber that declared an ack label requested by the publisher is not authorized to receive a published signal</li>
<li>or: a subscriber that declared an ack label requested by the publisher discards the published signal due to namespace or RQL filtering</li>
</ul>
<p>resending the signal will not help.
Ditto now emits a “weak acknowledgement” for such cases that does not trigger redelivery.</p>
<h4 id="ditto-internal-pubsub-supports-using-a-grouping-concept"><a href="https://github.com/eclipse/ditto/issues/878">Ditto internal pub/sub supports using a “grouping” concept</a></h4>
<p>A “group” concept was added to Ditto pub/sub:</p>
<ul>
<li>Subscribers may subscribe with a group name.</li>
<li>Published signals are delivered to exactly 1 subscriber within each group chosen consistently according to the entity ID.</li>
</ul>
<p>With this feature, the event publishing at connections will scale with the number of client actors by having the client
actors subscribe for events directly using the connection ID as group.</p>
<h4 id="addition-of-cloudevents-http-endpoint"><a href="https://github.com/eclipse/ditto/issues/889">Addition of “cloudevents” HTTP endpoint</a></h4>
<p>While <a href="https://cloudevents.io">cloud events</a> provide bindings for Kafka, MQTT, … they also have an HTTP endpoint
binding, which can easily be used in the combination with Knative.</p>
<p>With addition of a new HTTP endpoint <code class="highlighter-rouge">/cloudevents</code>, it is now possible to easily map incoming messages from any
Knative eventing source to Eclipse Ditto, acting as a Knative eventing sink.</p>
<p>A special thanks to <a href="https://github.com/ctron">Jens Reimann (ctron)</a> from <a href="https://github.com/RedHatOfficial">RedHat</a>
for this addition to Eclipse Ditto.</p>
<h3 id="bugfixes">Bugfixes</h3>
<p>Several bugs in Ditto 1.4.0 were fixed for 1.5.0.<br />
This is a complete list of the
<a href="https://github.com/eclipse/ditto/pulls?q=is%3Apr+milestone%3A1.5.0">merged pull requests</a>, including the fixed bugs.<br />
Here as well for the Ditto Java Client: <a href="https://github.com/eclipse/ditto-clients/pulls?q=is%3Apr+milestone%3A1.5.0">merged pull requests</a></p>
<h4 id="fix-that-sending-messages-with-non-existing-value-was-not-possible-via-http-endpoints"><a href="https://github.com/eclipse/ditto/pull/875">Fix that sending messages with non-existing “value” was not possible via HTTP endpoints</a></h4>
<p>The HTTP <code class="highlighter-rouge">/messages</code> endpoints did not allow that a Ditto Protocol messages with non-existing <code class="highlighter-rouge">"value"</code> were created for
HTTP invocations which did not include payload at all.</p>
<p>That was fixed in the way that for requests with <code class="highlighter-rouge">Content-Length: 0</code> the <code class="highlighter-rouge">"value"</code> is now removed from the resulting
Ditto Protocol message instead of being <code class="highlighter-rouge">"value": ""</code> (empty JSON string).</p>
<h4 id="ditto-java-client-when-starting-consumption-with-invalid-filter-wrongly-timeout-exception-is-propagate-to-the-user"><a href="https://github.com/eclipse/ditto-clients/pull/105">Ditto Java client: When starting consumption with invalid filter, wrongly timeout exception is propagate to the user</a></h4>
<p><code class="highlighter-rouge">dittoClient.twin().startConsumption(org.eclipse.ditto.client.options.Options.Consumption.filter("invalidFilter"))</code>
throwed a wrong exception and did not propagate the real error to the user.</p>
<p>Affected <a href="https://github.com/eclipse/ditto/pull/902">Ditto PR</a>.</p>
<h4 id="ditto-java-client-fix-featurechange-consumption-for-specific-feature-change-registration"><a href="https://github.com/eclipse/ditto-clients/pull/101">Ditto Java client: Fix FeatureChange consumption for specific feature change-registration</a></h4>
<p>This fixes a bug that caused ignoring features in a FeatureChange for change-registrations on single features,
when only a single subpath exists in the feature (i.e. feature with only properties).</p>
<h2 id="migration-notes">Migration notes</h2>
<h3 id="mongodb-hostname-configuration">MongoDB hostname configuration</h3>
<p>Due to the <a href="https://github.com/eclipse/ditto/pull/888">consolidation of config files</a>, it is now <strong>required to configure
the MongoDB <code class="highlighter-rouge">hostname</code> explicitly</strong> as the default hostname was changed to <code class="highlighter-rouge">localhost</code>.<br />
Previously, this hostname was automatically set to <code class="highlighter-rouge">mongodb</code> (which is the hostname of the MongoDB when e.g. the
<code class="highlighter-rouge">docker-compose.yaml</code> deployment is used) in Docker based environments.</p>
<p>This now has to be manually done via the environment variable <code class="highlighter-rouge">MONGO_DB_HOSTNAME</code>.</p>
<p>The default <code class="highlighter-rouge">docker-compose.yaml</code> was also adjusted accordingly:
<a href="https://github.com/eclipse/ditto/blob/master/deployment/docker/docker-compose.yml">docker-compose.yml</a></p>
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