Hi All,

I’ve followed pretty much all of the book so have most of the pieces in place. Really enjoyed it so far!

Running on a rpi4. Using wifi to talk to the rpi4. I can ssh onto and download firmware to the rpi4 no problem. I can’t seem to get measurements off the rpi4 though.

From the log I get this message every 10s when the rpi4 tries to publish the measurements to the Phoenix server on my host machine:

23:31:03.506 [debug] Server response: {:error, %Mint.TransportError{reason: :econnrefused}}

My host machine is Windows 11, with WSL2 running ubuntu. On this machine I start phx.server logs:

…
graham@DESKTOP-Q3UO4M4:~/weather_tracker$ mix phx.server
warning: use Mix.Config is deprecated. Use the Config module instead
config/config.exs:8

warning: use Mix.Config is deprecated. Use the Config module instead
config/dev.exs:1

[info] Running WeatherTrackerWeb.Endpoint with cowboy 2.9.0 at 0.0.0.0:4000 (http)
[info] Access WeatherTrackerWeb.Endpoint at http://localhost:4000
…

I’ve set up the http://localhost:4000 in mu config/target/exs as:
…
config :sensor_hub, :weather_tracker_url,
“http://localhost:4000/api/weather-conditions”
…

So I think I have all that correct. But I receive no measurements. When I go on to the rpi4 I only see the messages wit the TransportError.

It feels like a network config problem but I’m new to nerves and elixir would appreciate any advice you have.

Many thanks,
Graham