Implement Openflow Protocol and Callback system

lib/tres/controller.ex

@@ -0,0 +1,14 @@
+defmodule Tres.Controller do
+  def controller_helpers do
+    quote do
+      import Tres.SwitchRegistry, only: [send_message: 2]
+
+      use Tres.Messages
+      use Tres.MessageHelper
+    end
+  end
+
+  defmacro __using__(_) do
+    controller_helpers()
+  end
+end