FYI only - transient error - worked upon retry...
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>ERROR: The request could not be satisfied</TITLE>
</HEAD>
<BODY>
<H1>504 Gateway Timeout ERROR</H1>
<H2>The request could not be satisfied.</H2>
<HR noshade size="1px">
We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner.
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If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation.
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<HR noshade size="1px">
<PRE>
Generated by cloudfront (CloudFront) HTTP3 Server
Request ID:[redacted];
</PRE>
<ADDRESS>
</ADDRESS>
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</HTML>
FYI only - transient error - worked upon retry...
https://energy.franklinwh.com/hes-gateway/terminal/sendMqtt