fixup

lib/tcp_handler.ex

@@ -0,0 +1,43 @@
+defmodule TcpHandler do
+  def start(port) do
+    # 監聽端口
+    {:ok, listen_socket} =
+      :gen_tcp.listen(port, [
+        :binary,
+        packet: :line,
+        reuseaddr: true,
+        active: false,
+        backlog: 100
+      ])
+
+    accept_loop(listen_socket)
+  end
+
+  defp accept_loop(listen_socket) do
+    case :gen_tcp.accept(listen_socket) do
+      {:ok, socket} ->
+        spawn(__MODULE__, :handle_client, [socket])
+        accept_loop(listen_socket)
+
+      {:error, reason} ->
+        IO.puts("接受連接失敗: #{reason}")
+    end
+  end
+
+  def handle_client(socket) do
+    # 接收數據
+    case :gen_tcp.recv(socket, 0) do
+      {:ok, data} ->
+        IO.puts("收到: #{data}")
+        :gen_tcp.send(socket, "Echo: #{data}")
+        # 繼續接收
+        handle_client(socket)
+
+      {:error, :closed} ->
+        IO.puts("客戶端斷開連接")
+
+      {:error, reason} ->
+        IO.puts("接收數據失敗: #{reason}")
+    end
+  end
+end