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afaict you can't use HTTPS in any reasonable way with IoT. There are no solutions that don't cost $$$$$$$+

note: I know you were not suggesting HTTPS as a solution only as an example of a standard used other places. I'm only pointing it out as another example of an issue IoT has which is lack of solutions .

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Why do you need to spend money to use HTTPS with IoT?

how do you get a cert for each device? let's encrypt limits the number of certs per domain (that includes sub domains). so unless you expect users to get their own domains for their IoT devices they can't get a free cert based on user unique subdomains you provide.

The only solution I know of is Plex's solution which was to partner with a CA for $$$$$$

https://blog.filippo.io/how-plex-is-doing-https-for-all-its-...

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