[core] Add ESP8266 support to wake_loop_any_context()

Wire Application::wake_loop_any_context() to socket::socket_wake()
on ESP8266. This allows any component calling wake_loop_any_context()
from an ISR or callback to immediately wake the main loop from
esp_delay() sleep, instead of waiting up to 16ms for the timeout.

Changes:
- Add IRAM_ATTR to socket_wake() so it's safe to call from ISR context
- Add ESP8266 wake_loop_any_context() backed by socket::socket_wake()
- Extend enable_loop_soon_any_context() to wake the loop on ESP8266

esphome/components/socket/lwip_raw_tcp_impl.cpp

@@ -41,7 +41,7 @@ void socket_delay(uint32_t ms) {
   esp_delay(ms, []() { return !s_socket_woke; });
 }
 
-void socket_wake() {
+void IRAM_ATTR socket_wake() {
   s_socket_woke = true;
   esp_schedule();
 }

esphome/components/socket/socket.h

@@ -126,7 +126,8 @@ size_t format_sockaddr_to(const struct sockaddr *addr_ptr, socklen_t len, std::s
 /// On ESP8266, lwip callbacks set a flag and call esp_schedule() to wake the delay.
 void socket_delay(uint32_t ms);
 
-/// Called by lwip callbacks to signal socket activity and wake delay.
+/// Signal socket/IO activity and wake the main loop from esp_delay() early.
+/// ISR-safe: uses IRAM_ATTR internally and only sets a volatile flag + esp_schedule().
 void socket_wake();
 #endif
 

esphome/core/application.h

@@ -33,6 +33,9 @@
 #endif
 #endif
 #endif  // USE_SOCKET_SELECT_SUPPORT
+#if defined(USE_ESP8266) && defined(USE_SOCKET_IMPL_LWIP_TCP)
+#include "esphome/components/socket/socket.h"
+#endif
 
 #ifdef USE_BINARY_SENSOR
 #include "esphome/components/binary_sensor/binary_sensor.h"
@@ -518,6 +521,12 @@ class Application {
 #endif
 #endif
 
+#if defined(USE_ESP8266) && defined(USE_SOCKET_IMPL_LWIP_TCP)
+  /// Wake the main event loop from any context (ISR, thread, or main loop).
+  /// On ESP8266: sets the socket wake flag and calls esp_schedule() to exit esp_delay() early.
+  static void IRAM_ATTR wake_loop_any_context() { socket::socket_wake(); }
+#endif
+
  protected:
   friend Component;
   friend class socket::Socket;

esphome/core/component.cpp

@@ -323,10 +323,11 @@ void IRAM_ATTR HOT Component::enable_loop_soon_any_context() {
   // 8. Race condition with main loop is handled by clearing flag before processing
   this->pending_enable_loop_ = true;
   App.has_pending_enable_loop_requests_ = true;
-#if defined(USE_LWIP_FAST_SELECT) && defined(USE_ESP32)
-  // Wake the main loop if sleeping in ulTaskNotifyTake(). Without this,
-  // the main loop would not wake until the select timeout expires (~16ms).
-  // Uses xPortInIsrContext() to choose the correct FreeRTOS notify API.
+#if (defined(USE_LWIP_FAST_SELECT) && defined(USE_ESP32)) || (defined(USE_ESP8266) && defined(USE_SOCKET_IMPL_LWIP_TCP))
+  // Wake the main loop from sleep. Without this, the main loop would not
+  // wake until the select/delay timeout expires (~16ms).
+  // ESP32: uses xPortInIsrContext() to choose the correct FreeRTOS notify API.
+  // ESP8266: sets socket wake flag and calls esp_schedule() to exit esp_delay() early.
   Application::wake_loop_any_context();
 #endif
 }