Getting the Pi to be able to work with the main computer.
        First to be sure that the phoenix is listening on the right addresses by adding 
            config :weather_tracker, WeatherTrackerWeb.Endpoint,
              http: [ip: {0, 0, 0, 0}, port: 4000]

        If that worked you are done and can check that it is working by running.
            ss -tuln | grep 4000   # on WSL
            netstat -ano | findstr :4000   # on Windows

            This should return all the addresses that the instance is listening on. You should see the pi on windows and the windows pc on the WSL instance

        If you are still getting an issue you might need to add in a rule for incomming connections on the correct port.
            netsh advfirewall firewall add rule name="Allow Phoenix 4000" dir=in action=allow protocol=TCP localport=4000

        You might still need to deal with the issues with a WSL instance being run on a windows computer.
            netsh interface portproxy add v4tov4 listenaddress=192.168.xx.xx listenport=4000 connectaddress=172.27.xx.xx connectport=4000
            # First address is the windows ip address and the second is the ip address for the WSL instance on the windows machine

            This did a few things 
                This set up a proxy for the IPv4 traffic
                Tells the computer on windows that anything that comes in on the address Windows where to forward it on WSL

                This was one of the most important things that happened as it made sure that all traffic is forwarded.