examples/AsyncWebServer_SendChunked/AsyncWebServer_SendChunked.ino

/****************************************************************************************************************************
  AsyncWebServer_SendChunked.ino

  For STM32 with LAN8720 (STM32F4/F7) or built-in LAN8742A Ethernet (Nucleo-144, DISCOVERY, etc)

  AsyncWebServer_STM32 is a library for the STM32 with LAN8720 or built-in LAN8742A Ethernet WebServer

  Based on and modified from ESPAsyncWebServer (https://github.com/me-no-dev/ESPAsyncWebServer)
  Built by Khoi Hoang https://github.com/khoih-prog/AsyncWebServer_STM32
  Licensed under GPLv3 license
 *****************************************************************************************************************************/
/*
   Currently support
   1) STM32 boards with built-in Ethernet (to use USE_BUILTIN_ETHERNET = true) such as :
      - Nucleo-144 (F429ZI, F767ZI)
      - Discovery (STM32F746G-DISCOVERY)
      - STM32 boards (STM32F/L/H/G/WB/MP1) with 32K+ Flash, with Built-in Ethernet,
      - See How To Use Built-in Ethernet at (https://github.com/khoih-prog/EthernetWebServer_STM32/issues/1)
   2) STM32F/L/H/G/WB/MP1 boards (with 64+K Flash) running ENC28J60 shields (to use USE_BUILTIN_ETHERNET = false)
   3) STM32F/L/H/G/WB/MP1 boards (with 64+K Flash) running W5x00 shields
   4) STM32F4 and STM32F7 boards (with 64+K Flash) running LAN8720 shields
*/

#include "defines.h"

// In bytes
#define STRING_SIZE                    50000

AsyncWebServer server(80);

int reqCount = 0;                // number of requests received

const int led = 13;

#define BUFFER_SIZE         512
char temp[BUFFER_SIZE];

void createPage(String &pageInput)
{
  int sec = millis() / 1000;
  int min = sec / 60;
  int hr = min / 60;
  int day = hr / 24;

  snprintf(temp, BUFFER_SIZE - 1,
           "<html>\
<head>\
<meta http-equiv='refresh' content='5'/>\
<title>AsyncWebServer-%s</title>\
<style>\
body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; Color: #000088; }\
</style>\
</head>\
<body>\
<h2>AsyncWebServer_SendChunked!</h2>\
<h3>running on %s</h3>\
<p>Uptime: %d d %02d:%02d:%02d</p>\
</body>\
</html>", BOARD_NAME, BOARD_NAME, day, hr % 24, min % 60, sec % 60);

  pageInput = temp;
}

void handleNotFound(AsyncWebServerRequest *request)
{
  String message = "File Not Found\n\n";

  message += "URI: ";
  message += request->url();
  message += "\nMethod: ";
  message += (request->method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += request->args();
  message += "\n";

  for (uint8_t i = 0; i < request->args(); i++)
  {
    message += " " + request->argName(i) + ": " + request->arg(i) + "\n";
  }

  request->send(404, "text/plain", message);
}

String out;

void handleRoot(AsyncWebServerRequest *request)
{
  // clear the String to start over
  out = String();

  createPage(out);

  out += "<html><body>\r\n<table><tr><th>INDEX</th><th>DATA</th></tr>";

  for (uint16_t lineIndex = 0; lineIndex < 500; lineIndex++)
  {
    out += "<tr><td>";
    out += String(lineIndex);
    out += "</td><td>";
    out += "AsyncWebServer_SendChunked_ABCDEFGHIJKLMNOPQRSTUVWXYZ</td></tr>";
  }
  
  out += "</table></body></html>\r\n";

  LOGDEBUG1("Total length to send in chunks =", out.length());

  AsyncWebServerResponse *response = request->beginChunkedResponse("text/html", [](uint8_t *buffer, size_t maxLen, size_t filledLength) -> size_t
  {
    size_t len = min(maxLen, out.length() - filledLength);
    memcpy(buffer, out.c_str() + filledLength, len);

    LOGDEBUG1("Bytes sent in chunk =", len);
    
    return len;
  });

  request->send(response);
}


void setup()
{
  out.reserve(STRING_SIZE);
  
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);
  
  Serial.begin(115200);

  while (!Serial && millis() < 5000);

  delay(200);

  Serial.print("\nStart AsyncWebServer_SendChunked on ");
  Serial.print(BOARD_NAME);
  Serial.print(" with ");
  Serial.println(SHIELD_TYPE);
 Serial.println(ASYNC_WEBSERVER_STM32_VERSION);

#if (_ASYNCWEBSERVER_STM32_LOGLEVEL_ > 2)
 Serial.print("STM32 Core version v");
  Serial.print(STM32_CORE_VERSION_MAJOR);
  Serial.print(".");
  Serial.print(STM32_CORE_VERSION_MINOR);
  Serial.print(".");
  Serial.println(STM32_CORE_VERSION_PATCH);
#endif

  // start the ethernet connection and the server
  // Use random mac
  uint16_t index = millis() % NUMBER_OF_MAC;

  // Use Static IP
  //Ethernet.begin(mac[index], ip);
  // Use DHCP dynamic IP and random mac
  Ethernet.begin(mac[index]);

  ///////////////////////////////////

  server.on("/", HTTP_GET, [](AsyncWebServerRequest * request)
  {
    handleRoot(request);
  });

  server.on("/inline", [](AsyncWebServerRequest * request)
  {
    request->send(200, "text/plain", "This works as well");
  });

  server.onNotFound(handleNotFound);

  server.begin();

  Serial.print(F("AsyncWebServer is @ IP : "));
  Serial.println(Ethernet.localIP());
}

void heartBeatPrint()
{
  static int num = 1;

  Serial.print(F("."));

  if (num == 80)
  {
    Serial.println();
    num = 1;
  }
  else if (num++ % 10 == 0)
  {
    Serial.print(F(" "));
  }
}

void check_status()
{
  static unsigned long checkstatus_timeout = 0;

#define STATUS_CHECK_INTERVAL     10000L

  // Send status report every STATUS_REPORT_INTERVAL (60) seconds: we don't need to send updates frequently if there is no status change.
  if ((millis() > checkstatus_timeout) || (checkstatus_timeout == 0))
  {
    heartBeatPrint();
    checkstatus_timeout = millis() + STATUS_CHECK_INTERVAL;
  }
}

void loop()
{
  check_status();
}