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2021-12-20-http-live-channel.html
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<h1 class="post-title" itemprop="name headline">Sending live channel commands via HTTP to devices</h1>
<p class="post-meta">Published by <img src="https://www.gravatar.com/avatar/4125883975796a6f81e380b371438549?s=135" alt="A photo of Stefan Maute" style="width:50px;border-radius:50%;display:inline-block;margin-right:5px;" /><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name"><a href="https://github.com/stmaute" target="_blank">Stefan Maute</a> </span></span> on <time datetime="2021-12-20T00:00:00+00:00" itemprop="datePublished">Dec 20, 2021</time> - Tags:
<a href="tag_blog.html">blog</a>,
<a href="tag_http.html">http</a>
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<p>The upcoming release of Eclipse Ditto <strong>version 2.3.0</strong> will support sending commands via the HTTP API
directly to devices using the <a href="protocol-twinlive.html#live">live channel</a> by just adding the <code class="language-plaintext highlighter-rouge">channel=live</code>
query parameter to the same HTTP API request which would target the <a href="protocol-twinlive.html#twin">twin</a>.</p>
<h2 id="http-live-channel">HTTP Live channel</h2>
<p>Ditto supports sending all kind of <a href="protocol-specification-things.html#commands">Thing commands</a> via
the <code class="language-plaintext highlighter-rouge">live</code> channel directly to devices.
When sending a <code class="language-plaintext highlighter-rouge">live</code> command to a device, the device is responsible for sending a correlated and correct response
in <a href="protocol-overview.html">Ditto Protocol</a>.</p>
<p>Ditto supports two types of <code class="language-plaintext highlighter-rouge">channel</code>s for communication.</p>
<ul>
<li><a href="protocol-twinlive.html#twin">twin</a>: The default value of the channel parameter is <code class="language-plaintext highlighter-rouge">twin</code>
to communicate with the persisted <strong>twin</strong> representation.</li>
<li><a href="protocol-twinlive.html#live">live</a>: The <code class="language-plaintext highlighter-rouge">channel</code> parameter can be changed to <code class="language-plaintext highlighter-rouge">live</code>
to communicate with the real device.</li>
</ul>
<div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> In order to use the live channel, the device receiving live commands must be able to understand
and answer in <a href="protocol-specification.html">Ditto Protocol messages</a> with the
<a href="protocol-specification-topic.html#live-channel">topic’s channel being <code class="language-plaintext highlighter-rouge">live</code></a>.</div>
<p>When using the <code class="language-plaintext highlighter-rouge">twin</code> channel, the command is routed to the Ditto backend and handled by the <strong>twin</strong> persistence.
Before using the <code class="language-plaintext highlighter-rouge">live</code> channel, it is necessary to create the <strong>digital twin</strong> of the device in the
Ditto backend.</p>
<p>If the <code class="language-plaintext highlighter-rouge">live</code> channel is used, the command is directly routed to the device. In this case the device is
responsible for answering the command and sending back a response. In case no response is sent back, the Ditto HTTP API
is responding with <code class="language-plaintext highlighter-rouge">408 Request Timeout</code>.<br />
The default timeout for live commands is <code class="language-plaintext highlighter-rouge">10s</code> but it can be changed by setting the <code class="language-plaintext highlighter-rouge">timeout</code> parameter to the
desired value.</p>
<p>Ditto ensures that the <code class="language-plaintext highlighter-rouge">correlation ID</code>, <code class="language-plaintext highlighter-rouge">entity ID</code>, <code class="language-plaintext highlighter-rouge">path</code> and <code class="language-plaintext highlighter-rouge">command response type</code> of the command response
is the same as in the sending command. If this is not the case, Ditto is dropping the response and the caller of the
HTTP request will get a <code class="language-plaintext highlighter-rouge">408 Request Timeout</code> with a message that the timeout was caused by an incompatible
command response from the device.</p>
<h3 id="permissions-for-live-commands">Permissions for live commands</h3>
<p>Sending live commands to devices is restricted by the policy of the thing.<br />
Thus Ditto ensures that only authorized parties with <code class="language-plaintext highlighter-rouge">WRITE</code> permission are able to send commands or messages.<br />
Ditto also filters responses from the device based on the policy. This ensures that the requester only gets the data
where he/she has <code class="language-plaintext highlighter-rouge">READ</code> permission on.</p>
<p>For retrieve commands, the <a href="basic-auth.html#authenticated-subjects">authenticated subject</a> needs to have
(at least partial) <code class="language-plaintext highlighter-rouge">READ</code> permission at the resource which is requested.<br />
In case a <code class="language-plaintext highlighter-rouge">RetrieveThing</code> (via HTTP a <code class="language-plaintext highlighter-rouge">GET /api/2/things/<thing-id></code>) command is sent to a real device and the
requester only has partial <code class="language-plaintext highlighter-rouge">READ</code> permission on the thing, the response is filtered based on the policy
and only the fields where <code class="language-plaintext highlighter-rouge">READ</code> permission is granted are returned.</p>
<h3 id="live-commands-via-http-api">Live commands via HTTP API</h3>
<p>When using the HTTP API the <code class="language-plaintext highlighter-rouge">channel</code> parameter can either be specified via HTTP Header or via HTTP query parameter.<br />
In the examples below both ways are possible to specify the channel parameter.</p>
<h4 id="live-command-with-http-header">Live command with HTTP Header</h4>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>curl <span class="nt">-X</span> GET <span class="nt">-H</span> <span class="s1">'channel: live'</span> <span class="nt">-H</span> <span class="s1">'timeout: 30s'</span> /api/2/things/org.eclipse.ditto:coffeebrewer<span class="s1">'
</span></code></pre></div></div>
<h4 id="live-command-with-http-query-parameter">Live command with HTTP query parameter</h4>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>curl <span class="nt">-X</span> GET /api/2/things/org.eclipse.ditto:coffeebrewer?channel<span class="o">=</span>live&timeout<span class="o">=</span>30s<span class="s1">'
</span></code></pre></div></div>
<h2 id="example">Example</h2>
<p>The following section provides an example how to use the HTTP <code class="language-plaintext highlighter-rouge">live</code> channel together with the Ditto Java client.</p>
<p>For demonstration purpose, we assume that the thing with ID <code class="language-plaintext highlighter-rouge">org.eclipse.ditto:outdoor-sensor</code> already exists.</p>
<p>In this example we want to retrieve the live state of the device by sending a <code class="language-plaintext highlighter-rouge">RetrieveThing</code> command via
the <code class="language-plaintext highlighter-rouge">live</code> channel directly to the device.</p>
<h3 id="permissions-to-execute-the-example">Permissions to execute the example</h3>
<p>For this example, the <a href="basic-auth.html#authenticated-subjects">authenticated subject</a> has
<code class="language-plaintext highlighter-rouge">READ</code> and <code class="language-plaintext highlighter-rouge">WRITE</code> permissions on the complete thing resource to send the command and retrieve the full response.</p>
<h3 id="executing-the-example">Executing the example</h3>
<p>When sending a command over the <code class="language-plaintext highlighter-rouge">live</code> channel to a device, the device needs to take action and send back a response.<br />
The response from the device is routed back to the initial requester of the <code class="language-plaintext highlighter-rouge">live</code> command at the HTTP API.</p>
<p>In this example the <a href="client-sdk-java.html">Ditto Java Client</a> acts as device and sends back the response.<br />
The following snippet shows how to register for retrieve thing live commands and send back a <code class="language-plaintext highlighter-rouge">RetrieveThingResponse</code>.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nc">String</span> <span class="n">thingId</span> <span class="o">=</span> <span class="s">"org.eclipse.ditto:outdoor-sensor"</span><span class="o">;</span>
<span class="nc">String</span> <span class="n">featureId</span> <span class="o">=</span> <span class="s">"environment-sensor"</span><span class="o">;</span>
<span class="nc">Attributes</span> <span class="n">attributes</span> <span class="o">=</span> <span class="nc">Attributes</span><span class="o">.</span><span class="na">newBuilder</span><span class="o">()</span>
<span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="s">"location"</span><span class="o">,</span> <span class="s">"outdoor in the woods"</span><span class="o">)</span>
<span class="o">.</span><span class="na">build</span><span class="o">();</span>
<span class="nc">Feature</span> <span class="n">feature</span> <span class="o">=</span> <span class="nc">ThingsModelFactory</span><span class="o">.</span><span class="na">newFeatureBuilder</span><span class="o">()</span>
<span class="o">.</span><span class="na">properties</span><span class="o">(</span><span class="nc">ThingsModelFactory</span><span class="o">.</span><span class="na">newFeaturePropertiesBuilder</span><span class="o">()</span>
<span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="s">"temperature"</span><span class="o">,</span> <span class="mf">9.2</span><span class="o">)</span>
<span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="s">"humidity"</span><span class="o">,</span> <span class="mf">56.3</span><span class="o">)</span>
<span class="o">.</span><span class="na">build</span><span class="o">())</span>
<span class="o">.</span><span class="na">withId</span><span class="o">(</span><span class="n">featureId</span><span class="o">)</span>
<span class="o">.</span><span class="na">build</span><span class="o">();</span>
<span class="nc">Thing</span> <span class="n">thing</span> <span class="o">=</span> <span class="nc">ThingsModelFactory</span><span class="o">.</span><span class="na">newThingBuilder</span><span class="o">()</span>
<span class="o">.</span><span class="na">setId</span><span class="o">(</span><span class="n">thingId</span><span class="o">)</span>
<span class="o">.</span><span class="na">setFeature</span><span class="o">(</span><span class="n">feature</span><span class="o">)</span>
<span class="o">.</span><span class="na">setAttributes</span><span class="o">(</span><span class="n">attributes</span><span class="o">)</span>
<span class="o">.</span><span class="na">build</span><span class="o">();</span>
<span class="c1">// initialize the ditto-client and startConsumption() of live commands</span>
<span class="nc">DittoClient</span> <span class="n">dittoClient</span> <span class="o">=</span> <span class="o">...</span> <span class="o">;</span>
<span class="n">dittoClient</span><span class="o">.</span><span class="na">live</span><span class="o">()</span>
<span class="o">.</span><span class="na">forId</span><span class="o">(</span><span class="n">thingId</span><span class="o">)</span>
<span class="o">.</span><span class="na">handleRetrieveThingCommandsFunction</span><span class="o">(</span><span class="n">retrieveThingLiveCommand</span> <span class="o">-></span> <span class="o">{</span>
<span class="k">return</span> <span class="n">retrieveThingLiveCommand</span><span class="o">.</span><span class="na">answer</span><span class="o">()</span>
<span class="o">.</span><span class="na">withResponse</span><span class="o">(</span><span class="n">response</span> <span class="o">-></span> <span class="n">response</span><span class="o">.</span><span class="na">retrieved</span><span class="o">(</span><span class="n">thing</span><span class="o">));</span>
<span class="o">});</span>
</code></pre></div></div>
<p>When the above shown code snippet is running and the following HTTP request is sent out:</p>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>curl <span class="nt">-X</span> GET /api/2/things/org.eclipse.ditto:outdoor-sensor?channel<span class="o">=</span>live&timeout<span class="o">=</span>15s
</code></pre></div></div>
<p>The received HTTP response payload should look like this:</p>
<div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w">
</span><span class="nl">"thingId"</span><span class="p">:</span><span class="w"> </span><span class="s2">"org.eclipse.ditto:outdoor-sensor"</span><span class="p">,</span><span class="w">
</span><span class="nl">"_namespace"</span><span class="p">:</span><span class="w"> </span><span class="s2">"org.eclipse.ditto"</span><span class="p">,</span><span class="w">
</span><span class="nl">"attributes"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="nl">"location"</span><span class="p">:</span><span class="w"> </span><span class="s2">"outdoor in the woods"</span><span class="w">
</span><span class="p">},</span><span class="w">
</span><span class="nl">"features"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="nl">"environment-sensor"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="nl">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
</span><span class="nl">"temperature"</span><span class="p">:</span><span class="w"> </span><span class="mf">9.2</span><span class="p">,</span><span class="w">
</span><span class="nl">"humidity"</span><span class="p">:</span><span class="w"> </span><span class="mf">56.3</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>
<h2 id="feedback">Feedback?</h2>
<p>Please <a href="feedback.html">get in touch</a> if you have feedback or questions towards this new functionality.</p>
<p><br />
<br /></p>
<figure><img class="docimage" src="images/ditto.svg" alt="Ditto" style="max-width: 500px" /></figure>
<p>–<br />
The Eclipse Ditto team</p>
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