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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.
https://github.com/unixko/MitsuCon (This one shows the wiring harness that docks into a ESP8266 on one side and mitsu on the other side. Here is the copy-pasta to put in Google to find the connection details on the Mitsu side "A connector to CN105 port on heat pump is JST PAP-05V-S.")
https://github.com/gysmo38/mitsubishi2MQTT (this isn't the best summary of the API you get, just what I can find in 5 min)
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Hence, a higher number means a more popular project.