Enable setting config securely in firmware/config/secrets.exs

morse/.gitignore

@@ -21,4 +21,3 @@ erl_crash.dump
 
 # Ignore package tarball (built via "mix hex.build").
 morse-*.tar
-

morse/lib/morse.ex

@@ -21,12 +21,7 @@ defmodule Morse do
   """
 
   def signal do
-    case System.get_env("MORSE_MESSAGE") do
-      nil ->
-        # Signal for SOS if the env variable wasn't found :)
-        signal("...---...")
-      message -> signal(message)
-    end
+    signal(Application.fetch_env!(:morse, :morse_message))
   end
 
   def signal(symbols) do

morse/mix.exs

@@ -14,7 +14,8 @@ defmodule Morse.MixProject do
   # Run "mix help compile.app" to learn about applications.
   def application do
     [
-      extra_applications: [:logger]
+      extra_applications: [:logger],
+      env: [morse_message: "...---..."]
     ]
   end