diff --git a/app/src/main/java/com/shuwei/dish/match/scale/ScaleServiceManager.kt b/app/src/main/java/com/shuwei/dish/match/scale/ScaleServiceManager.kt
index ed8cc65..173288b 100644
--- a/app/src/main/java/com/shuwei/dish/match/scale/ScaleServiceManager.kt
+++ b/app/src/main/java/com/shuwei/dish/match/scale/ScaleServiceManager.kt
@@ -128,9 +128,8 @@ object ScaleServiceManager {
         if (role == DeviceRole.MASTER) {
             startMasterServices(context, deviceId)
         } else {
-            // 子设备：启动 UDP 广播，作为 mDNS 的兜底发现机制
-            val localIp = getLocalIp(context)
-            udpSender = UdpBroadcastSender(deviceId, localIp).also { it.start() }
+            // 子设备：启动 UDP 广播，作为 mDNS 的兜底发现机制；每次广播时动态获取 IP，避免启动时网络未就绪导致 IP 为空
+            udpSender = UdpBroadcastSender(deviceId = deviceId, ipProvider = { getLocalIp(context) }).also { it.start() }
         }
     }
 
diff --git a/app/src/main/java/com/shuwei/dish/match/scale/UdpBroadcastSender.kt b/app/src/main/java/com/shuwei/dish/match/scale/UdpBroadcastSender.kt
index 0eab2d6..f59a616 100644
--- a/app/src/main/java/com/shuwei/dish/match/scale/UdpBroadcastSender.kt
+++ b/app/src/main/java/com/shuwei/dish/match/scale/UdpBroadcastSender.kt
@@ -13,10 +13,12 @@ import java.util.concurrent.TimeUnit
  * UDP 广播发送器（子设备运行）
  * 每隔固定间隔向局域网广播本机的 deviceId、IP、WebSocket 端口
  * 作为 mDNS 的兜底发现机制，确保主设备能可靠发现子设备
+ *
+ * @param ipProvider 动态获取本机 IP 的函数，每次广播时调用；返回空字符串时跳过本次广播
  */
 class UdpBroadcastSender(
     private val deviceId: String,
-    private val localIp: String,
+    private val ipProvider: () -> String,
     private val wsPort: Int = MdnsRegisterManager.WS_PORT
 ) {
 
@@ -43,12 +45,18 @@ class UdpBroadcastSender(
         task = scheduler.scheduleWithFixedDelay({
             sendBroadcast()
         }, 0, INTERVAL_SEC, TimeUnit.SECONDS)
-        Log.d(TAG, "UDP 广播已启动, deviceId=$deviceId, ip=$localIp, port=$wsPort")
+        Log.d(TAG, "UDP 广播已启动, deviceId=$deviceId, port=$wsPort")
     }
 
     private fun sendBroadcast() {
         try {
-            val payload = gson.toJson(Payload(deviceId, localIp, wsPort))
+            val ip = ipProvider()
+            // 网络未就绪时跳过本次广播，等待下一个周期重试
+            if (ip.isEmpty()) {
+                Log.d(TAG, "IP 未就绪，跳过本次广播")
+                return
+            }
+            val payload = gson.toJson(Payload(deviceId, ip, wsPort))
             val data = payload.toByteArray(Charsets.UTF_8)
             DatagramSocket().use { socket ->
                 socket.broadcast = true