examples/AdvancedWebServer/AdvancedWebServer.ino

/**************************************************************************************************************************************
  AdvancedWebServer.ino - Simple Arduino web server sample for SAMD21 running WiFiNINA shield
  For any WiFi shields, such as WiFiNINA W101, W102, W13x, or custom, such as ESP8266/ESP32-AT, Ethernet, etc

  WiFiWebServer is a library for the ESP32-based WiFi shields to run WebServer
  Forked and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Forked and modified from Arduino WiFiNINA library https://www.arduino.cc/en/Reference/WiFiNINA
  Built by Khoi Hoang https://github.com/khoih-prog/WiFiWebServer
  Licensed under MIT license

  Copyright (c) 2015, Majenko Technologies
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:

  Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

  Redistributions in binary form must reproduce the above copyright notice, this
  list of conditions and the following disclaimer in the documentation and/or
  other materials provided with the distribution.

  Neither the name of Majenko Technologies nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ***************************************************************************************************************************************/

#include "defines.h"

int status = WL_IDLE_STATUS;     // the Wifi radio's status
int reqCount = 0;                // number of requests received

WiFiWebServer server(80);

#if defined(LED_BUILTIN)
  const int led =  LED_BUILTIN;
#else
  #if (ESP32)
    // Using pin 13 will crash ESP32_C3
    const int led =  2;
  #else
    const int led =  13;
  #endif
#endif

void handleRoot()
{
#define BUFFER_SIZE     512

  digitalWrite(led, 1);
  char temp[BUFFER_SIZE];
  int sec = millis() / 1000;
  int min = sec / 60;
  int hr = min / 60;
  int day = hr / 24;

  hr = hr % 24;

  snprintf(temp, BUFFER_SIZE - 1,
           "<html>\
<head>\
<meta http-equiv='refresh' content='5'/>\
<title>%s</title>\
<style>\
body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; Color: #000088; }\
</style>\
</head>\
<body>\
<h1>Hello from %s</h1>\
<h3>running WiFiWebServer</h3>\
<h3>on %s</h3>\
<p>Uptime: %d d %02d:%02d:%02d</p>\
<img src=\"/test.svg\" />\
</body>\
</html>", BOARD_NAME, BOARD_NAME, SHIELD_TYPE, day, hr, min % 60, sec % 60);

  server.send(200, F("text/html"), temp);
  digitalWrite(led, 0);
}

void handleNotFound()
{
  digitalWrite(led, 1);

  String message = F("File Not Found\n\n");

  message += F("URI: ");
  message += server.uri();
  message += F("\nMethod: ");
  message += (server.method() == HTTP_GET) ? F("GET") : F("POST");
  message += F("\nArguments: ");
  message += server.args();
  message += F("\n");

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

  server.send(404, F("text/plain"), message);

  digitalWrite(led, 0);
}


#define ORIGINAL_STR_LEN        (2048 * MULTIPLY_FACTOR)

//String out;

void drawGraph()
{
  static String out;
  static uint16_t previousStrLen = ORIGINAL_STR_LEN;

  if (out.length() == 0)
  {
    WS_LOGWARN1(F("String Len = 0, extend to"), ORIGINAL_STR_LEN);
    out.reserve(ORIGINAL_STR_LEN);
  }

#if (MULTIPLY_FACTOR == 1)

  out = F( "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"310\" height=\"150\">\n" \
           "<rect width=\"310\" height=\"150\" fill=\"rgb(250, 230, 210)\" stroke-width=\"3\" stroke=\"rgb(0, 0, 0)\" />\n" \
           "<g stroke=\"blue\">\n");

#elif (MULTIPLY_FACTOR == 2)

  out = F( "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"610\" height=\"150\">\n" \
           "<rect width=\"610\" height=\"150\" fill=\"rgb(250, 230, 210)\" stroke-width=\"3\" stroke=\"rgb(0, 0, 0)\" />\n" \
           "<g stroke=\"blue\">\n");

#elif (MULTIPLY_FACTOR == 4)

  out = F( "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"1210\" height=\"150\">\n" \
           "<rect width=\"1210\" height=\"150\" fill=\"rgb(250, 230, 210)\" stroke-width=\"3\" stroke=\"rgb(0, 0, 0)\" />\n" \
           "<g stroke=\"blue\">\n");

#endif

  char temp[70];

  int y = rand() % 130;

  for (int x = 10; x < (300 * MULTIPLY_FACTOR); x += 10)
  {
    int y2 = rand() % 130;
    sprintf(temp, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke-width=\"2\" />\n", x, 140 - y, x + 10, 140 - y2);
    out += temp;
    y = y2;
  }

  out += F("</g>\n</svg>\n");

  WS_LOGDEBUG1(F("String Len = "), out.length());

  if (out.length() > previousStrLen)
  {
    WS_LOGERROR3(F("String Len > "), previousStrLen, F(", extend to"), out.length() + 48);

    previousStrLen = out.length() + 48;

    out.reserve(previousStrLen);
  }
  else
  {
    server.send(200, "image/svg+xml", out);
  }
}

void setup()
{
  //out.reserve(ORIGINAL_STR_LEN);

  pinMode(led, OUTPUT);
  digitalWrite(led, 0);

  Serial.begin(115200);

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

  delay(200);

  Serial.print(F("\nStarting AdvancedWebServer on "));
  Serial.print(BOARD_NAME);
  Serial.print(F(" with "));
  Serial.println(SHIELD_TYPE);
  Serial.println(WIFI_WEBSERVER_VERSION);

#if WIFI_USING_ESP_AT

  // initialize serial for ESP module
  EspSerial.begin(115200);
  // initialize ESP module
  WiFi.init(&EspSerial);

  Serial.println(F("WiFi shield init done"));

#endif

#if ! (ESP32 || ESP8266)
  // check for the presence of the shield
#if USE_WIFI_NINA

  if (WiFi.status() == WL_NO_MODULE)
#else
  if (WiFi.status() == WL_NO_SHIELD)
#endif
  {
    Serial.println(F("WiFi shield not present"));

    // don't continue
    while (true);
  }

#endif

#if USE_WIFI_NINA
  String fv = WiFi.firmwareVersion();

  if (fv < WIFI_FIRMWARE_LATEST_VERSION)
  {
    Serial.println(F("Please upgrade the firmware"));
  }

#endif

#if (ESP32 || ESP8266)
  WiFi.mode(WIFI_STA);

  Serial.print(F("Connecting to WPA SSID: "));
  Serial.println(ssid);

  if (WiFi.status() != WL_CONNECTED)
  {
    if (strlen(pass) >= 8)
    {
      WiFi.begin(ssid, pass);
    }
    else
    {
      WiFi.begin(ssid);
    }
  }

  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
  }

#else

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED)
  {
    //delay(500);
    Serial.print(F("Connecting to WPA SSID: "));
    Serial.println(ssid);
    // Connect to WPA/WPA2 network
    status = WiFi.begin(ssid, pass);
  }

#endif

  server.on(F("/"), handleRoot);
  server.on(F("/test.svg"), drawGraph);
  server.on(F("/inline"), []()
  {
    server.send(200, F("text/plain"), F("This works as well"));
  });

  server.onNotFound(handleNotFound);

  server.begin();

  Serial.print(F("HTTP server started @ "));
  Serial.println(WiFi.localIP());
}

void heartBeatPrint()
{
  static int num = 1;

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

  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     60000L

  // 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()
{
  server.handleClient();
  check_status();
}