I don’t know how to setup SmetThings. Need to make an SSL? Why don’t you just do it using LetsEncrypt for free? I can’t pay monthly, and I want Alexa/Google… so I use SmartThings as my ZigBee hub, not ZHA. I am a web programmer and a web-hoster, and I still don’t know how to get it working.
You don’t need pay. You can use DuckDNS + Letscripts and it works fine, or pay 5-6$/year and use Cloudflare.
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Your issue is you are connecting to a cloud service that needs two way communications (smartthings is cloud. Your zigbee is round tripping the Internet to turn on a light switch, no you can’t change that, you MIGHT be able tk get direct comms using MATTER but I don’t know if they support matter bridge yet (last check they didn’t ST choice.)
There is zero wauyto do that (web auth) without telling the other side what to connect to in the callback… If you’re a web programmer then you get that
So now you have to tell the cloud to connect to… HA being local that’s your home so?
Secure web presence is hard (take it from an infrastructure puke, it’s insanely hard to do securely) so you can
A-stand up your own reverse proxy (essentially what people recommend with DuckDNS, et, Al)
B-use a service because you don’t want to build or maintain that… (What NabutCasa basically offers)
Frankly I’m coming from the perspective I’m amazed it’s as easy as it actually is (compared to 2012 when I was using smartthings)
For me. Either pay a few bucks a month or build an entire infrastructure to provide secure reverse proxy… Easy choice. Nabu gets my money.