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Add clarification that MQTT Out requires payload to send msg
Fixes #2370
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@ -36,7 +36,7 @@
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<h3>Inputs</h3>
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<dl class="message-properties">
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<dt>payload <span class="property-type">string | buffer</span></dt>
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<dd> most users prefer simple text payloads, but binary buffers can also be published.</dd>
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<dd> the payload to publish. If this property is not set, no message will be sent. To send a blank message, set this property to an empty String.</dd>
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<dt class="optional">topic <span class="property-type">string</span></dt>
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<dd> the MQTT topic to publish to.</dd>
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