Update na verzi 3.7.2. POZOR: vyzaduje do platformio.ini doplnit lib_compat_mode = strict
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152
examples/SlowChunkResponse/SlowChunkResponse.ino
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152
examples/SlowChunkResponse/SlowChunkResponse.ino
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// SPDX-License-Identifier: LGPL-3.0-or-later
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// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov
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//
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// Simulate a slow response in a chunk response (like file download from SD Card)
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// poll events will be throttled.
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//
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#include <Arduino.h>
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#ifdef ESP32
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#include <AsyncTCP.h>
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#include <WiFi.h>
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#elif defined(ESP8266)
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#include <ESP8266WiFi.h>
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#include <ESPAsyncTCP.h>
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#elif defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
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#include <RPAsyncTCP.h>
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#include <WiFi.h>
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#endif
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#include <ESPAsyncWebServer.h>
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static AsyncWebServer server(80);
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static const char *htmlContent PROGMEM = R"(
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<!DOCTYPE html>
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<html>
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<head>
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<title>Sample HTML</title>
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</head>
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<body>
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<h1>Hello, World!</h1>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod
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rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper
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arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit
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accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi.
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Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo
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dapibus elit, id varius sem dui id lacus.</p>
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</body>
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</html>
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)";
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static const size_t htmlContentLength = strlen_P(htmlContent);
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static constexpr char characters[] = "0123456789ABCDEF";
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static size_t charactersIndex = 0;
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void setup() {
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Serial.begin(115200);
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#ifndef CONFIG_IDF_TARGET_ESP32H2
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WiFi.mode(WIFI_AP);
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WiFi.softAP("esp-captive");
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#endif
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// curl -v http://192.168.4.1/
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server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
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// need to cast to uint8_t*
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// if you do not, the const char* will be copied in a temporary String buffer
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request->send(200, "text/html", (uint8_t *)htmlContent, htmlContentLength);
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});
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// IMPORTANT - DO NOT WRITE SUCH CODE IN PRODUCTON !
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//
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// This example simulates the slowdown that can happen when:
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// - downloading a huge file from sdcard
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// - doing some file listing on SDCard because it is horribly slow to get a file listing with file stats on SDCard.
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// So in both cases, ESP would deadlock or TWDT would trigger.
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//
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// This example simulats that by slowing down the chunk callback:
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// - d=2000 is the delay in ms in the callback
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// - l=10000 is the length of the response
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//
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// time curl -N -v -G -d 'd=2000' -d 'l=10000' http://192.168.4.1/slow.html --output -
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//
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server.on("/slow.html", HTTP_GET, [](AsyncWebServerRequest *request) {
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uint32_t d = request->getParam("d")->value().toInt();
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uint32_t l = request->getParam("l")->value().toInt();
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Serial.printf("d = %" PRIu32 ", l = %" PRIu32 "\n", d, l);
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AsyncWebServerResponse *response = request->beginChunkedResponse("text/html", [d, l](uint8_t *buffer, size_t maxLen, size_t index) -> size_t {
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Serial.printf("%u\n", index);
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// finished ?
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if (index >= l) {
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return 0;
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}
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// slow down the task to simulate some heavy processing, like SD card reading
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delay(d);
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memset(buffer, characters[charactersIndex], 256);
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charactersIndex = (charactersIndex + 1) % sizeof(characters);
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return 256;
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});
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request->send(response);
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});
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server.begin();
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}
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static uint32_t lastHeap = 0;
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void loop() {
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#ifdef ESP32
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uint32_t now = millis();
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if (now - lastHeap >= 2000) {
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Serial.printf("Free heap: %" PRIu32 "\n", ESP.getFreeHeap());
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lastHeap = now;
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}
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#endif
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}
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