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IMHO, this would be a perfect application to build using Elixir and Phoenix LiveView. I think it would provide really robust realtime capabilities, and fits well with things like binary pattern matching that Elixir and Erlang handle well.

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Also something like a C++ core connected to sensors and InfluxDB+Grafana to display the data would be good.

I personally wouldn't use web technologies to write critical medical software, but if I did it would be in Elixir or Erlang for the optimized garbage collection and supervision trees.

I agree with you on LiveView as well. I believe it would prove to be more reliable than client-side JavaScript.

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