From e9f9a9f33e844a05abdf201fd9570accacc23d72 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 21 Aug 2026 18:07:28 -0500
Subject: [PATCH] Show the effective TCP send buffer in the config dump

---
 esphome/components/network/network_component.cpp | 10 ++++++++++
 esphome/components/network/network_component.h   |  1 +
 2 files changed, 11 insertions(+)

diff --git a/esphome/components/network/network_component.cpp b/esphome/components/network/network_component.cpp
index cf457bb661..7e05983733 100644
--- a/esphome/components/network/network_component.cpp
+++ b/esphome/components/network/network_component.cpp
@@ -6,6 +6,7 @@
 #include "esp_err.h"
 #include "esp_netif.h"
 #include "esp_event.h"
+#include "lwip/opt.h"
 
 #ifdef USE_NETWORK_DEFAULT_ROUTE
 #include "esphome/core/application.h"
@@ -43,6 +44,15 @@ void NetworkComponent::setup() {
   }
 }
 
+void NetworkComponent::dump_config() {
+  // The effective compile-time lwIP value, so the log reflects tcp_send_buffer
+  // or the high performance bundle when either changed it.
+  ESP_LOGCONFIG(TAG,
+                "Network:\n"
+                "  TCP send buffer: %d bytes",
+                TCP_SND_BUF);
+}
+
 #ifdef USE_NETWORK_DEFAULT_ROUTE
 static esp_netif_t *connected_wifi_netif() {
 #ifdef USE_WIFI
diff --git a/esphome/components/network/network_component.h b/esphome/components/network/network_component.h
index 8d4866d4f0..870530974e 100644
--- a/esphome/components/network/network_component.h
+++ b/esphome/components/network/network_component.h
@@ -13,6 +13,7 @@ namespace esphome::network {
 class NetworkComponent final : public Component {
  public:
   void setup() override;
+  void dump_config() override;
   // AFTER_BLUETOOTH: BLE controller must initialize before esp_netif_init per IDF guidance.
   float get_setup_priority() const override { return setup_priority::AFTER_BLUETOOTH; }