Added test case

examples/Issue85/Issue85.ino

@@ -0,0 +1,108 @@
+#include <Arduino.h>
+#ifdef ESP8266
+  #include <ESP8266WiFi.h>
+#endif
+#ifdef ESP32
+  #include <WiFi.h>
+#endif
+#include <ESPAsyncWebServer.h>
+
+void connect_wifi() {
+  WiFi.mode(WIFI_AP);
+  WiFi.softAP("esp-captive");
+
+  // Serial.print("Connecting");
+  // while (WiFi.status() != WL_CONNECTED) {
+  //   delay(500);
+  //   Serial.print(".");
+  // }
+  // Serial.println();
+
+  // Serial.print("Connected, IP address: ");
+  // Serial.println(WiFi.localIP());
+}
+
+void notFound(AsyncWebServerRequest* request) {
+  request->send(404, "text/plain", "Not found");
+}
+
+AsyncWebServer server(80);
+AsyncWebSocket ws("/ws");
+
+// initial stack
+char* stack_start;
+
+void printStackSize() {
+  char stack;
+  Serial.print(F("stack size "));
+  Serial.print(stack_start - &stack);
+  Serial.print(F(" | Heap free:"));
+  Serial.print(ESP.getFreeHeap());
+#ifdef ESP8266
+  Serial.print(F(" frag:"));
+  Serial.print(ESP.getHeapFragmentation());
+  Serial.print(F(" maxFreeBlock:"));
+  Serial.print(ESP.getMaxFreeBlockSize());
+#endif
+  Serial.println();
+}
+
+void onWsEventEmpty(AsyncWebSocket* server, AsyncWebSocketClient* client, AwsEventType type, void* arg, uint8_t* data, size_t len) {
+  printStackSize();
+  // Just answer
+  client->text("PONGTEST");
+}
+
+void serve_upload(AsyncWebServerRequest* request, const String& filename, size_t index, uint8_t* data, size_t len, bool final) {
+  Serial.print("> onUpload ");
+  Serial.print("index: ");
+  Serial.print(index);
+  Serial.print(" len:");
+  Serial.print(len);
+  Serial.print(" final:");
+  Serial.print(final);
+  Serial.println();
+}
+
+void setup() {
+  char stack;
+  stack_start = &stack;
+
+  Serial.begin(115200);
+  Serial.println("\n\n\nStart");
+  Serial.printf("stack_start: %p\n", stack_start);
+
+  connect_wifi();
+
+  server.onNotFound(notFound);
+
+  ws.onEvent(onWsEventEmpty);
+  server.addHandler(&ws);
+
+  server.on("/upload", HTTP_POST, [](AsyncWebServerRequest* request) { request->send(200); }, serve_upload);
+
+  server.begin();
+  Serial.println("Server started");
+}
+
+String msg = "";
+uint32_t count = 0;
+void loop() {
+
+  ws.cleanupClients();
+
+  count += 1;
+
+  // Concatenate some string, and clear it after some time
+  static unsigned long millis_string = millis();
+  if (millis() - millis_string > 1) {
+    millis_string += 100;
+    if (count % 100 == 0) {
+      // printStackSize();
+      // Serial.print(msg);
+      msg = String();
+    } else {
+      msg += 'T';
+    }
+  }
+}

platformio.ini

@@ -2,9 +2,10 @@
 default_envs = arduino-2, arduino-3, arduino-310rc1, esp8266, raspberrypi
 lib_dir = .
 ; src_dir = examples/CaptivePortal
-src_dir = examples/SimpleServer
+; src_dir = examples/SimpleServer
 ; src_dir = examples/StreamFiles
 ; src_dir = examples/Filters
+src_dir = examples/Issue85
 
 [env]
 framework = arduino