Build a Weather Station with Elixir and Nerves: Phoenix IP address binding question

Community PragProg Customers
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I may doing something wrong, but I had to edit the WeatherTrackerWeb.Endpoint to change the IP to {0, 0, 0, 0} (as suggested in a boilerplate comment) in dev.exs. I’m not sure if I missed it somewhere in the book, or if there’s another place the endpoint IP should be specified.