Fix FunctionClauseError when attempting to handle message in error state

README.md

@@ -15,7 +15,7 @@ Implements:
 ```elixir
 def deps do
   [
-    {:ex_turn, "~> 0.2.0"}
+    {:ex_turn, "~> 0.2.1"}
   ]
 end
 ```

lib/ex_turn/client.ex

@@ -233,7 +233,7 @@ defmodule ExTURN.Client do
     case {permission, channel} do
       {false, nil} ->
         Logger.warning("""
-        Tyring to send data but there is no permission for: #{inspect(ip)}. Ignoring.
+        Trying to send data but there is no permission for: #{inspect(ip)}. Ignoring.
         """)
 
         {:ok, client}
@@ -262,7 +262,12 @@ defmodule ExTURN.Client do
   end
 
   @spec handle_message(t(), message()) :: on_handle_message()
-  def handle_message(%__MODULE__{state: state} = client, msg) when state != :error do
+  def handle_message(%__MODULE__{state: :error} = client, _msg) do
+    Logger.debug("Trying to handle internal/external message in state: error. Ignoring.")
+    {:error, :invalid_state, client}
+  end
+
+  def handle_message(client, msg) do
     do_handle_message(client, msg)
   end
 

mix.exs

@@ -1,7 +1,7 @@
 defmodule ExTURN.MixProject do
   use Mix.Project
 
-  @version "0.2.0"
+  @version "0.2.1"
   @source_url "https://github.com/elixir-webrtc/ex_turn"
 
   def project do

test/ex_turn/client_test.exs

@@ -304,6 +304,9 @@ defmodule ExTURN.ClientTest do
       msg = {:socket_data, @turn_ip, @turn_port, data}
 
       assert {:ok, %Client{}} = Client.handle_message(client, msg)
+
+      client = %{client | state: :error}
+      assert {:error, :invalid_state, ^client} = Client.handle_message(client, msg)
     end
   end