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After 16 years, Ecobee is shutting down support for the original smart thermostat
(www.theverge.com)
This is a most excellent place for technology news and articles.
A link to the official notice: https://support.ecobee.com/s/articles/Connectivity-and-Support-for-Legacy-Products
(It was the first link in the article, good job The Verge)
That's why I have KNX.