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libraries/ESP_Async_WebServer/examples/ServerState/ServerState.ino

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+// SPDX-License-Identifier: LGPL-3.0-or-later
+// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov
+
+//
+// Server state example
+//
+
+#include <Arduino.h>
+#if defined(ESP32) || defined(LIBRETINY)
+#include <AsyncTCP.h>
+#include <WiFi.h>
+#elif defined(ESP8266)
+#include <ESP8266WiFi.h>
+#include <ESPAsyncTCP.h>
+#elif defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
+#include <RPAsyncTCP.h>
+#include <WiFi.h>
+#endif
+
+#include <ESPAsyncWebServer.h>
+
+static AsyncWebServer server1(80);
+static AsyncWebServer server2(80);
+
+void setup() {
+  Serial.begin(115200);
+
+#if SOC_WIFI_SUPPORTED || CONFIG_ESP_WIFI_REMOTE_ENABLED || LT_ARD_HAS_WIFI || CONFIG_ESP32_WIFI_ENABLED
+  WiFi.mode(WIFI_AP);
+  WiFi.softAP("esp-captive");
+#endif
+
+  // server state returns one of the tcp_state enum values:
+  // enum tcp_state {
+  //   CLOSED      = 0,
+  //   LISTEN      = 1,
+  //   SYN_SENT    = 2,
+  //   SYN_RCVD    = 3,
+  //   ESTABLISHED = 4,
+  //   FIN_WAIT_1  = 5,
+  //   FIN_WAIT_2  = 6,
+  //   CLOSE_WAIT  = 7,
+  //   CLOSING     = 8,
+  //   LAST_ACK    = 9,
+  //   TIME_WAIT   = 10
+  // };
+
+  assert(server1.state() == tcp_state::CLOSED);
+  assert(server2.state() == tcp_state::CLOSED);
+
+  server1.begin();
+
+  assert(server1.state() == tcp_state::LISTEN);
+  assert(server2.state() == tcp_state::CLOSED);
+
+  server2.begin();
+
+  assert(server1.state() == tcp_state::LISTEN);
+  assert(server2.state() == tcp_state::CLOSED);
+
+  Serial.println("Done!");
+}
+
+void loop() {
+  delay(100);
+}