Application and basic MQTT subscriber

lib/neon_vertigo_service/mqtt.ex

@@ -0,0 +1,25 @@
+defmodule NeonVertigoService.Mqtt do
+  use GenServer
+
+  def start_link(_) do
+    GenServer.start_link(__MODULE__, {})
+  end
+  
+  def init(_) do
+    mqtt_config = Application.fetch_env!(:neon_vertigo_service, :mqtt_params)
+    {:ok, mqtt_pid} = :emqtt.start_link([{:owner, self()} | mqtt_config]) 
+    {:ok, _mqtt_props} = :emqtt.connect(mqtt_pid)
+    Process.link(mqtt_pid)
+
+    :emqtt.subscribe(mqtt_pid, %{}, [{"$share/neon-vertigo-service/test/+", [{:qos, 1}]}])
+
+    {:ok, {mqtt_pid}}
+  end
+
+  # Handling MQTT messages
+  def handle_info({:publish, msg}, state) do
+    IO.puts("Received message") 
+    IO.inspect(msg)
+    {:noreply, state}
+  end
+end