it works somewhat

eisrom_ui/lib/eisrom_ui/morse/server.ex

@@ -34,7 +34,7 @@ defmodule Eisrom.Morse.Server do
       # apply(pubsub(), :broadcast, [EisromUi.PubSub, "morse_progress", 0])
       {:reply, :ok, {nil, 0}}
     else
-      pid = spawn(&Eisrom.Morse.Worker.signal/0)
+      pid = spawn(&EisromUi.Morse.Worker.signal/0)
       {:reply, :ok, {pid, 0}}
     end
   end
@@ -49,7 +49,7 @@ defmodule Eisrom.Morse.Server do
 
   @impl true
   def handle_cast({:progress, new_progress}, {pid, _progress}) do
-    Phoenix.PubSub.broadcast(EiromUi.PubSub, "morse_progress", new_progress)
+    Phoenix.PubSub.broadcast(EisromUi.PubSub, "morse_progress", new_progress)
     # apply(pubsub(), :broadcast, [EisromUi.PubSub, "morse_progress", new_progress])
     {:noreply, {pid, new_progress}}
   end

eisrom_ui/lib/eisrom_ui/morse/worker.ex

@@ -1,4 +1,4 @@
-defmodule Eisrom.Morse.Worker do
+defmodule EisromUi.Morse.Worker do
   @moduledoc """
   Functions to control the signal lamp connected with GPIO.
   """
@@ -65,26 +65,12 @@ defmodule Eisrom.Morse.Worker do
     |> String.to_charlist()
   end
 
-  # Communicate with a deployed esrom node, if running on a host.
-  case Application.get_env(:eisrom_ui, :target) do
-    :host ->
-      @esrom_node :"esrom@esrom.lan"
+  def toggle_lamp(state) do
+    {:ok, gpio} = Circuits.GPIO.open(relay_pin(), :output)
+    Circuits.GPIO.write(gpio, state)
+  end
 
-      def toggle_lamp(state) do
-        # Check if the deployed esrom node is online.
-        if :pong == Node.ping(@esrom_node) do
-          :rpc.call(@esrom_node, Eisrom.Morse.Worker, :toggle_lamp, [state])
-        end
-      end
-
-    _ ->
-      def toggle_lamp(state) do
-        {:ok, gpio} = Circuits.GPIO.open(relay_pin(), :output)
-        Circuits.GPIO.write(gpio, state)
-      end
-
-      defp relay_pin() do
-        Application.fetch_env!(:eisrom_ui, :relay_pin)
-      end
+  defp relay_pin() do
+    Application.fetch_env!(:eisrom_ui, :relay_pin)
   end
 end