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<div class="subTitle">org.apache.edgent.connectors.iot</div>
<h2 title="Class HeartBeat" class="title">Class HeartBeat</h2>
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<pre>public class <span class="typeNameLabel">HeartBeat</span>
extends <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">An IoT device heartbeat event generator.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;com.google.gson.JsonObject&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/iot/HeartBeat.html#addHeartBeat-org.apache.edgent.connectors.iot.IotDevice-long-java.util.concurrent.TimeUnit-java.lang.String-">addHeartBeat</a></span>(<a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html" title="interface in org.apache.edgent.connectors.iot">IotDevice</a>&nbsp;iotDevice,
long&nbsp;period,
<a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a>&nbsp;unit,
<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;eventId)</code>
<div class="block">Add IoT device heart beat processing to a topology.</div>
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<h4>addHeartBeat</h4>
<pre>public static&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;com.google.gson.JsonObject&gt;&nbsp;addHeartBeat(<a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html" title="interface in org.apache.edgent.connectors.iot">IotDevice</a>&nbsp;iotDevice,
long&nbsp;period,
<a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a>&nbsp;unit,
<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;eventId)</pre>
<div class="block">Add IoT device heart beat processing to a topology.
<P>
An IoTDevice event containing heart beat information
is periodically published to the specified <code>eventId</code>.
</P>
<P>
The heart beat provides clients of the IoT hub with liveness information
about the device and its connection to the hub.
</P>
<P>
The heart beat also ensures there is some immediate output so
the connection to the IoT hub happens as soon as possible.
In the case where there may not otherwise be
IoT events to publish, a heart beat ensures a connection
to the IoT hub is maintained.
</P>
<P>
The heart beat's event payload is the JSON for a JsonObject with the
heart beat's properties:
<ul>
<li>"when" : (string) ISO8601 UTC date/time. e.g. "2016-07-12T17:57:08Z"</li>
<li>"time" : (number) <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#currentTimeMillis--" title="class or interface in java.lang"><code>System.currentTimeMillis()</code></a></li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>iotDevice</code> - IoT hub device</dd>
<dd><code>period</code> - the heart beat period</dd>
<dd><code>unit</code> - TimeUnit for the period</dd>
<dd><code>eventId</code> - the IotDevice eventId to use for the event</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <code>TStream&lt;JsonObject&gt;</code> heartbeat stream</dd>
</dl>
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