node-red-nodes/function/rbe/rbe.html

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    <p>Report by Exception node - only passes on data if the payload has changed.</p>
    <p>It can also block until the value changes by a specified amount - deadband modes.</p>
    <h3>Inputs</h3>
    <dl class="message-properties">
        <dt>payload
            <span class="property-type">number | string | (object)</span>
        </dt>
        <dd>RBE mode will accept numbers, strings, and simple objects. Other modes must provide a parseable number.</dd>
        <dt class="optional">topic <span class="property-type">string</span>
        </dt>
        <dd>if specified the function will work on a per topic basis.</dd>
        <dt class="optional">reset<span class="property-type">any</span></dt>
        <dd>if set clears the stored value for the specified msg.topic, or
        all topics if msg.topic is not specified.</dd> 
    </dl>
    <h3>Outputs</h3>
    <dl class="message-properties">
        <dt>payload
            <span class="property-type">as per input</span>
        </dt>
        <dd>If triggered the output will be the same as the input.</dd>
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    <h3>Details</h3>
    <p>In RBE mode this node will block until the <code>msg.payload</code> is
    different to the previous one. </p>
    <p>In Deadband modes the incoming payload must contain a parseable number and is
    output only if greater than + or - the band gap away from a previous value.</p>
    <p>Deadband also supports % - only sends if the input differs by more than x% of the original value.</p>
    <p>In Narrowband mode the incoming payload is blocked if it is more than + or - the band gap
    away from the previous value. Useful for ignoring outliers from a faulty sensor for example.</p>
    <p>Both Deadband and Narrowband allow comparison against either the previous valid output value, thus
    ignoring any values out of range; or the previous input value, which resets the set point, thus allowing
    gradual drift (deadband), or a step change (narrowband).</p>
    <p><b>Note:</b> This works on a per <code>msg.topic</code> basis. This means that a single rbe node can
    handle multiple different topics at the same time.</p>
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