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frp
A fast reverse proxy to help you expose a local server behind a NAT or firewall to the internet.
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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.
You could also use something like ZeroTier for this. Every device outside your LAN will need to have the client installed (including your Server/Phone, but it will solve your CGNAT problem.
you also could run a reverse proxy program like FRP, though I'm not sure if you could run the client on termux, as I haven't tried it myself
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