Improve WebSocket server startup and error reporting

- Introduce a brief wait time to ensure the port is released before starting the server.
- Update server options to allow port reuse, enhancing server flexibility.
- Enhance error handling during context creation to provide more informative error messages regarding port usage and permissions.

src/websocket_server.cpp

@@ -93,6 +93,9 @@ void WebSocketServer::stop() {
 }
 
 void WebSocketServer::startServer() {
+    // Kurze Wartezeit, falls ein vorheriger Prozess den Port noch freigibt
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    
     struct lws_context_creation_info info;
     memset(&info, 0, sizeof(info));
     info.port = port;
@@ -101,7 +104,8 @@ void WebSocketServer::startServer() {
     // Server-Optionen für mehrere gleichzeitige Verbindungen
     info.options = LWS_SERVER_OPTION_VALIDATE_UTF8 |
                    LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE |
-                   LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME;
+                   LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME |
+                   LWS_SERVER_OPTION_REUSE_ADDR;  // Erlaube Port-Wiederverwendung (SO_REUSEADDR)
     
     // Erlaube mehrere Verbindungen pro IP
     info.ka_time = 60;
@@ -127,7 +131,10 @@ void WebSocketServer::startServer() {
     
     context = lws_create_context(&info);
     if (!context) {
-        throw std::runtime_error("Failed to create LWS context");
+        std::string errorMsg = "Failed to create LWS context on port " + std::to_string(port);
+        errorMsg += ". Port may be in use or insufficient permissions.";
+        std::cerr << errorMsg << std::endl;
+        throw std::runtime_error(errorMsg);
     }
     
     std::cout << "WebSocket-Server erfolgreich gestartet auf Port " << port << std::endl;