From 2b887033c51fb90aaf1cdf8c72b47bae3f9c392c Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 15 Aug 2025 14:49:22 -0500
Subject: [PATCH] [core] Remove unnecessary FD_SETSIZE check on ESP32 and
 improve logging

---
 esphome/core/application.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/esphome/core/application.cpp b/esphome/core/application.cpp
index 73bf13ab7c..d2d47fe171 100644
--- a/esphome/core/application.cpp
+++ b/esphome/core/application.cpp
@@ -475,11 +475,16 @@ bool Application::register_socket_fd(int fd) {
   if (fd < 0)
     return false;
 
+#ifndef USE_ESP32
+  // Only check on non-ESP32 platforms
+  // On ESP32 (both Arduino and ESP-IDF), CONFIG_LWIP_MAX_SOCKETS is always <= FD_SETSIZE by design
+  // (LWIP_SOCKET_OFFSET = FD_SETSIZE - CONFIG_LWIP_MAX_SOCKETS per lwipopts.h)
+  // Other platforms may not have this guarantee
   if (fd >= FD_SETSIZE) {
-    ESP_LOGE(TAG, "Cannot monitor socket fd %d: exceeds FD_SETSIZE (%d)", fd, FD_SETSIZE);
-    ESP_LOGE(TAG, "Socket will not be monitored for data - may cause performance issues!");
+    ESP_LOGE(TAG, "fd %d exceeds FD_SETSIZE %d", fd, FD_SETSIZE);
     return false;
   }
+#endif
 
   this->socket_fds_.push_back(fd);
   this->socket_fds_changed_ = true;