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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.
The accepted answer states the you could use named pipes, but at the time we could not create a reliable communication between unity and WPF, because named pipes would randomly drop with unity. We ended up using this https://github.com/jacqueskang/IpcServiceFramework with TCP. Both unity and the WPF app had a server and a client so we could do two-way communication. (Altough you can use a number of other solutions for this. Maybe create a file which holds messages, one process reads it and the other writes to it)
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