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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.
In OpenVPN server config you just go with port 443 and use proto set to TCP. The example server.conf is here. Check lines 32 and 36
Have a look at openconnect.
I've run wireguard over iodine before just to test it out. It was slow, but can probably get around all but the most aggressive filtering.
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