From 29a6361df37b8e8f0742e5da884abd049bcfa247 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Tue, 7 Apr 2026 13:56:46 -1000
Subject: [PATCH] [mdns] Wrap raw port values in lambda in mdns_service()
 public API

---
 esphome/components/mdns/__init__.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/esphome/components/mdns/__init__.py b/esphome/components/mdns/__init__.py
index 0d535d6970..6f08887db8 100644
--- a/esphome/components/mdns/__init__.py
+++ b/esphome/components/mdns/__init__.py
@@ -131,6 +131,13 @@ def mdns_service(
     Returns:
         A StructInitializer representing a MDNSService struct
     """
+    # Wrap port in a stateless lambda for TemplatableFn storage
+    from esphome.cpp_generator import LambdaExpression
+
+    if not isinstance(port, LambdaExpression):
+        port = LambdaExpression(
+            f"return {cg.safe_exp(port)};", [], capture="", return_type=cg.uint16
+        )
     return cg.StructInitializer(
         MDNSService,
         ("service_type", cg.RawExpression(f"MDNS_STR({cg.safe_exp(service)})")),