fix: 优化网页端不能连接的问题

WebRTCSignalServer/src/main/java/com/ttstd/signaling/config/WebSocketConfig.java

@@ -1,10 +1,12 @@
 package com.ttstd.signaling.config;
 
 import com.ttstd.signaling.handler.SignalWebSocketHandler;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.socket.config.annotation.EnableWebSocket;
 import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
 import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
+import org.springframework.web.socket.server.standard.ServletServerContainerFactoryBean;
 
 @Configuration
 @EnableWebSocket
@@ -16,6 +18,21 @@ public class WebSocketConfig implements WebSocketConfigurer {
         this.signalWebSocketHandler = signalWebSocketHandler;
     }
 
+    /**
+     * 配置 WebSocket 容器的消息大小限制与会话超时。
+     * <p>默认文本消息缓冲区为 8KB，WebRTC SDP（OFFER/ANSWER）消息经 JSON 包装后
+     * 可能超过该限制，导致服务端抛出 TextMessageLimitException 并关闭连接。
+     * 此处将文本消息上限设为 512KB，二进制消息上限设为 512KB，会话空闲超时设为 10 分钟。
+     */
+    @Bean
+    public ServletServerContainerFactoryBean createWebSocketContainer() {
+        ServletServerContainerFactoryBean container = new ServletServerContainerFactoryBean();
+        container.setMaxTextMessageBufferSize(512 * 1024);   // 512 KB
+        container.setMaxBinaryMessageBufferSize(512 * 1024); // 512 KB
+        container.setMaxSessionIdleTimeout(600_000L);        // 10 分钟
+        return container;
+    }
+
     @Override
     public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
         registry.addHandler(signalWebSocketHandler, "/ws/signal")

WebRTCSignalServer/src/main/java/com/ttstd/signaling/handler/SignalWebSocketHandler.java

@@ -71,6 +71,9 @@ public class SignalWebSocketHandler extends TextWebSocketHandler {
                 case "DEVICE_LIST":
                     handleDeviceList(session, signalMessage);
                     break;
+                case "PING":
+                    // 客户端心跳保活消息，无需处理，仅用于防止中间代理因空闲超时断开连接
+                    break;
                 case "OFFER":
                     // 连接请求：统一经 ConnectionRequestManager 做校验/去重/待确认跟踪后再转发
                     handleConnectionRequest(signalMessage);