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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Depending on how deep you are going with smart home stuff, any Japanese aircon that is listed as "HEMS" compatible, will also be echonet lite certified. If you are using a smart home hub like Home Assistant, you can install this custom component, enter your aircon's IP address, and it should just work (at least it did for my Toshiba aircon). It's all done locally, so if there is an outage with amazon aws or whatever servers the company use, it doesn't affect you, and you can set up home assistant to be accessible from anywhere and can use an ios or android app to access it. It also allows you to actually make a smart home, not just a remote controlled home.