examples/AsyncWebServer_SendChunked/AsyncWebServer_SendChunked.ino

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

  For ESP8266 using W5x00/ENC8266 Ethernet

  AsyncWebServer_Ethernet is a library for the Ethernet with lwIP_5100, lwIP_5500 or lwIP_enc28j60 library

  Based on and modified from ESPAsyncWebServer (https://github.com/me-no-dev/ESPAsyncWebServer)
  Built by Khoi Hoang https://github.com/khoih-prog/AsyncWebServer_Ethernet
  Licensed under GPLv3 license
 *****************************************************************************************************************************/

#include "defines.h"

#include <AsyncWebServer_Ethernet.h>

// In bytes
#define STRING_SIZE                    50000

AsyncWebServer server(80);

int reqCount = 0;                // number of requests received

#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_WT32_ETH01!</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 initEthernet()
{
  SPI.begin();
  SPI.setClockDivider(SPI_CLOCK_DIV4);
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode(SPI_MODE0);

#if !USING_DHCP
  eth.config(localIP, gateway, netMask, gateway);
#endif

  eth.setDefault();

  if (!eth.begin())
  {
    Serial.println("No Ethernet hardware ... Stop here");

    while (true)
    {
      delay(1000);
    }
  }
  else
  {
    Serial.print("Connecting to network : ");

    while (!eth.connected())
    {
      Serial.print(".");
      delay(1000);
    }
  }

  Serial.println();

#if USING_DHCP
  Serial.print("Ethernet DHCP IP address: ");
#else
  Serial.print("Ethernet Static IP address: ");
#endif

  Serial.println(eth.localIP());
}

void setup()
{
  out.reserve(STRING_SIZE);
  
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LED_OFF);
  
  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_ETHERNET_VERSION);

  initEthernet();

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

  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(eth.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();
}