Add handler for serverbound_plugin_message (play)

lib/servers/play.ex

@@ -31,7 +31,10 @@ defmodule Amethyst.Server.Play do
 
   ## DESERIALIZATION
   @impl true
-
+  def deserialize(0x12, data) do
+    {[channel], data} = Read.start(data) |> Read.string |> Read.stop
+    {:serverbound_plugin_message, channel, data}
+  end
   def deserialize(type, _) do
     raise RuntimeError, "Got unknown packet type #{type}!"
   end
@@ -73,6 +76,10 @@ defmodule Amethyst.Server.Play do
 
   ## HANDLING
   @impl true
+  def handle({:serverbound_plugin_message, channel, data}, _client, state) do
+    Logger.debug("Got plugin message #{channel} with data #{inspect(data)}")
+    {:ok, state}
+  end
   def handle(tuple, _, state) do
     Logger.error("Unhandled but known packet #{elem(tuple, 0)}")
     {:unhandled, state}