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the body of the message.</p>
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<p>The function is expected to return a message object (or multiple message objects), but can choose
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to return nothing in order to halt a flow.</p>
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<p>Setup code executed before deploy can be specified in <b>Setup</b> tab. Also, cleanup code executed before flow shutdown can be specified in <b>Cleanup</b> tab.</p>
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<p>Setup code executed once whenever Node-RED is started or a new flow configuration is deployed can be specified in <b>Setup</b> tab. Also, cleanup code executed when the node is being stopped or re-deployed can be specified in <b>Close</b> tab.</p>
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<h3>Details</h3>
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<p>See the <a target="_blank" href="http://nodered.org/docs/writing-functions.html">online documentation</a>
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for more information on writing functions.</p>
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