wss://localhost:443/mqtt => ws://localhost:8083/mqtt
Do you want to rewrite port 443 to port 8083 through url rewriting? if so, you can try below rule:
<rule name="Farm" enabled="true" patternSyntax="Wildcard" stopProcessing="true">
<match url="(.*)" ignoreCase="true" />
<action type="Rewrite" url="localhost:8083/{R:0}" />
</rule>
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