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Device Management Federation API
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<h1>Device Management Federation API </h1>
<p>The DMF API provides Java classes which allows that the message body can be deserialized at runtime into a Java object. Also Java classes can be used to serialize Java objects into JSON bodies to send a message to hawkBit.
Currently, bodies of messages are based on JSON.</p>
<h2 id="basics">Basics</h2>
<p>There are three basic concepts of AMQP:</p>
<ul>
<li>Exchanges - what you publish to.</li>
<li>Queues - what you consume from.</li>
<li>Bindings - configuration that maps an exchange to a queue.</li>
</ul>
<p><strong>Queues</strong> are just a place for receiving messages.<br />
Bindings determine how messages get put in this place
Queues can also be bound to multiple exchanges.</p>
<p><strong>Exchanges</strong> are just publish messages.
The user decides who can produce on an exchange and who can create bindings on that exchange for delivery to a specific queue.</p>
<p>hawkBit will create all necessary queues, exchanges and bindings for the user, making it easy to get started.
The exchange name for outgoing messages is <strong>dmf.exchange</strong>.</p>
<p>The user has to set a <code>reply_to</code> header (see chapter below), to change the default sender exchange.</p>
<p>The following chapter describes the message body, header and properties.</p>
<p>Note: the DMF protocol was intended to be compatible to other use cases by design. As a result, DMF uses the term <strong>thing</strong> and not <strong>target</strong> but they are actually synonyms in this case.</p>
<h2 id="messages-sent-to-hawkbit">Messages sent to hawkBit</h2>
<p>All messages have to be sent to the exchange <strong>dmf.exchange</strong>.</p>
<h3 id="message-to-register-a-thing">Message to register a thing</h3>
<table>
<thead>
<tr>
<th>Message Header</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td>Type of the message</td>
<td>Fixed string &ldquo;THING_CREATED &ldquo;</td>
<td>true</td>
</tr>
<tr>
<td>thingId</td>
<td>The ID of the registered thing</td>
<td>String</td>
<td>true</td>
</tr>
<tr>
<td>tenant</td>
<td>The tenant this thing belongs to</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>Message Properties</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>reply_to</td>
<td>Exchange to reply to.</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<p><strong>Example Header</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=THING_CREATED <br /> tenant=tenant123 <br /> thingId=abc</td>
<td>reply_to=dmfclient.replyTo</td>
</tr>
</tbody>
</table>
<h3 id="message-to-update-target-attributes">Message to update target attributes</h3>
<table>
<thead>
<tr>
<th>Message Header</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td>Type of the message</td>
<td>Fixed string &ldquo;EVENT&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>topic</td>
<td>Topic to handle events different</td>
<td>Fixed string &ldquo;UPDATE_ATTRIBUTES&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>thingId</td>
<td>The ID of the registered thing</td>
<td>String</td>
<td>true</td>
</tr>
<tr>
<td>tenant</td>
<td>The tenant this thing belongs to</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>Message Properties</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>content_type</td>
<td>The content type of the payload</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<p><strong>Example Header and Payload</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=EVENT <br /> tenant=tenant123 <br /> thingId=abc <br /> topic=UPDATE_ATTRIBUTES</td>
<td>content_type=application/json</td>
</tr>
</tbody>
</table>
<p>Payload Template</p>
<pre><code class="language-json">{
&quot;attributes&quot;: {
&quot;exampleKey1&quot;: &quot;exampleValue1&quot;,
&quot;exampleKey2&quot;: &quot;exampleValue2&quot;
}
}
</code></pre>
<h3 id="message-to-send-an-action-status-event-to-hawkbit">Message to send an action status event to hawkBit</h3>
<p>The Java representation is ActionUpdateStatus:</p>
<table>
<thead>
<tr>
<th>Header</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td>Type of the message</td>
<td>Fixed string &ldquo;EVENT&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>topic</td>
<td>Topic to handle events different</td>
<td>Fixed string &ldquo;UPDATE_ACTION_STATUS&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>tenant</td>
<td>The tenant this thing belongs to</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>Message Properties</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>content_type</td>
<td>The content type of the payload</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<p>Payload Template</p>
<pre><code class="language-json">{
&quot;actionId&quot;: long,
&quot;softwareModuleId&quot;: long,
&quot;actionStatus&quot;: &quot;String&quot;,
&quot;message&quot;: [&quot;String&quot;]
}
</code></pre>
<p>Possible actionStatus</p>
<table>
<thead>
<tr>
<th>Header</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>DOWNLOAD</td>
<td>Device is downloading</td>
</tr>
<tr>
<td>RETRIEVED</td>
<td>Device management service has retrieved something</td>
</tr>
<tr>
<td>RUNNING</td>
<td>Update is running</td>
</tr>
<tr>
<td>FINISHED</td>
<td>Update process finished successful</td>
</tr>
<tr>
<td>ERROR</td>
<td>Error during update process</td>
</tr>
<tr>
<td>WARNING</td>
<td>Warning during update process</td>
</tr>
<tr>
<td>CANCELED</td>
<td>Cancel update process successful</td>
</tr>
<tr>
<td>CANCEL_REJECTED</td>
<td>Cancel update process has been rejected</td>
</tr>
</tbody>
</table>
<p><strong>Example Header and Payload</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=EVENT <br /> tenant=tenant123 <br /> topic=UPDATE_ACTION_STATUS</td>
<td>content_type=application/json</td>
</tr>
</tbody>
</table>
<pre><code class="language-json">{
&quot;actionId&quot;: 137,
&quot;softwareModuleId&quot;: 17,
&quot;actionStatus&quot;: &quot;DOWNLOAD&quot;,
&quot;message&quot;: [&quot;The download has started&quot;]
}
</code></pre>
<h3 id="message-to-cancel-an-update-task">Message to cancel an update task</h3>
<table>
<thead>
<tr>
<th>Header</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td>Type of the message</td>
<td>Fixed string &ldquo;Event&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>thingId</td>
<td>The ID of the registered thing</td>
<td>String</td>
<td>true</td>
</tr>
<tr>
<td>topic</td>
<td>Topic to handle events different</td>
<td>Fixed string &ldquo;CANCEL_DOWNLOAD&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>tenant</td>
<td>The tenant this thing belongs to</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>Message Properties</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>content_type</td>
<td>The content type of the payload</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<p>Payload Template</p>
<pre><code class="language-json">{
&quot;actionId&quot;: long
}
</code></pre>
<p><strong>Example Header and payload</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=EVENT <br /> tenant=tenant123 <br /> thingId=abc <br /> topic=CANCEL_DOWNLOAD</td>
<td>content_type=application/json</td>
</tr>
</tbody>
</table>
<pre><code class="language-json">{
&quot;actionId&quot;: 137
}
</code></pre>
<p>After this message has been sent, an action status event with either actionStatus=CANCELED or actionStatus=CANCEL_REJECTED has to be returned.</p>
<p><strong>Example Header and Payload when cancellation is successful</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=EVENT <br /> tenant=tenant123 <br /> topic=UPDATE_ACTION_STATUS</td>
<td>content_type=application/json</td>
</tr>
</tbody>
</table>
<pre><code class="language-json">{
&quot;actionId&quot;: 137,
&quot;softwareModuleId&quot;: 17,
&quot;actionStatus&quot;: &quot;CANCELED&quot;,
&quot;message&quot;: [&quot;The update was canceled.&quot;]
}
</code></pre>
<p><strong>Example Header and Payload when cancellation was rejected</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=EVENT <br /> tenant=tenant123 <br /> topic=UPDATE_ACTION_STATUS</td>
<td>content_type=application/json</td>
</tr>
</tbody>
</table>
<pre><code class="language-json">{
&quot;actionId&quot;: 137,
&quot;softwareModuleId&quot;: 17,
&quot;actionStatus&quot;: &quot;CANCEL_REJECTED&quot;,
&quot;message&quot;: [
&quot;The cancellation was not possible since the target sent an unexpected response.&quot;
]
}
</code></pre>
<h2 id="messages-sent-by-hawkbit">Messages sent by hawkBit</h2>
<p>All messages from hawkBit will be sent to the specified exchange in the <code>reply_to</code> property.</p>
<h3 id="message-sent-by-hawkbit-to-initialize-an-update-task">Message sent by hawkBit to initialize an update task</h3>
<table>
<thead>
<tr>
<th>Header</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td>Type of the message</td>
<td>Fixed string &ldquo;EVENT&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>thingId</td>
<td>The ID of the registered thing</td>
<td>String</td>
<td>true</td>
</tr>
<tr>
<td>topic</td>
<td>Topic to handle events different</td>
<td>Fixed string &ldquo;DOWNLOAD_AND_INSTALL&rdquo;</td>
<td>true</td>
</tr>
<tr>
<td>tenant</td>
<td>The tenant this thing belongs to</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>Message Properties</th>
<th>Description</th>
<th>Type</th>
<th>Mandatory</th>
</tr>
</thead>
<tbody>
<tr>
<td>content_type</td>
<td>The content type of the payload</td>
<td>String</td>
<td>true</td>
</tr>
</tbody>
</table>
<p>The Java representation is DownloadAndUpdateRequest:</p>
<p>Payload Template</p>
<pre><code class="language-json">{
&quot;actionId&quot;: long,
&quot;targetSecurityToken&quot;: &quot;String&quot;,
&quot;softwareModules&quot;: [
{
&quot;moduleId&quot;: long,
&quot;moduleType&quot;: &quot;String&quot;,
&quot;moduleVersion&quot;: &quot;String&quot;,
&quot;artifacts&quot;: [
{
&quot;filename&quot;: &quot;String&quot;,
&quot;urls&quot;: {
&quot;HTTP&quot;: &quot;String&quot;,
&quot;HTTPS&quot;: &quot;String&quot;
},
&quot;hashes&quot;: {
&quot;md5&quot;: &quot;String&quot;,
&quot;sha1&quot;: &quot;String&quot;
},
&quot;size&quot;: long
}
],
&quot;metadata&quot;: [
{
&quot;key&quot;: &quot;String&quot;,
&quot;value&quot;: &quot;String&quot;
}
]
}
]
}
</code></pre>
<p><strong>Example Header and Payload</strong></p>
<table>
<thead>
<tr>
<th>Headers</th>
<th>MessageProperties</th>
</tr>
</thead>
<tbody>
<tr>
<td>type=EVENT <br /> tenant=tenant123 <br /> thingId=abc <br /> topic=DOWNLOAD_AND_INSTALL</td>
<td>content_type=application/json</td>
</tr>
</tbody>
</table>
<pre><code class="language-json">{
&quot;actionId&quot;: 137,
&quot;targetSecurityToken&quot;: &quot;bH7XXAprK1ChnLfKSdtlsp7NOlPnZAYY&quot;,
&quot;softwareModules&quot;: [
{
&quot;moduleId&quot;: 7,
&quot;moduleType&quot;: &quot;firmware&quot;,
&quot;moduleVersion&quot;: &quot;7.7.7&quot;,
&quot;artifacts&quot;: [
{
&quot;filename&quot;: &quot;artifact.zip&quot;,
&quot;urls&quot;: {
&quot;HTTP&quot;: &quot;http://download-from-url.com&quot;,
&quot;HTTPS&quot;: &quot;https://download-from-url.com&quot;
},
&quot;hashes&quot;: {
&quot;md5&quot;: &quot;md5hash&quot;,
&quot;sha1&quot;: &quot;sha1hash&quot;
},
&quot;size&quot;: 512
}
],
&quot;metadata&quot;: [
{
&quot;key&quot;: &quot;installationType&quot;,
&quot;value&quot;: &quot;5784K#&quot;
}
]
}
]
}
</code></pre>
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