Port the frontend.

Enable ethernet connection.

ui/lib/ui_web/controllers/page_controller.ex

@@ -2,6 +2,37 @@ defmodule UiWeb.PageController do
   use UiWeb, :controller
 
   def index(conn, _params) do
-    render(conn, "index.html")
+    conn
+    |> send_resp(201, "")
+  end
+
+  def instructions(conn, _params) do
+    conn
+    |> render(:instructions)
+  end
+
+  def morse(conn, _params) do
+    conn
+    |> render(:morse)
+  end
+
+  def start(conn, _params) do
+    now = System.system_time(:second)
+
+    case get_start_time() do
+      start_time when start_time + 35 <= now ->
+        System.put_env("MORSE_START_TIME", Integer.to_string(now))
+        Ui.SignalMorse.signal()
+        text(conn, "Done.")
+      _ ->
+        text(conn, "It is still in progress...")
+    end
+  end
+
+  defp get_start_time() do
+    case System.get_env("MORSE_START_TIME") do
+      nil -> 0
+      start_time -> String.to_integer(start_time)
+    end
   end
 end