WebServer.ino

/****************************************************************************************************************************
  WebServer.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
  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Based on  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

  A simple web server that shows the value of the analog input pins via a web page using an ESP8266 module.
  This sketch will start an access point and print the IP address of your ESP8266 module to the Serial monitor.
  From there, you can open that address in a web browser to display the web page.
  The web page will be automatically refreshed each 20 seconds.

  For more details see: http://yaab-arduino.blogspot.com/p/wifiesp.html
 ***************************************************************************************************************************************/
#include "defines.h"

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

WiFiServer server(80);

void printWifiStatus()
{
  // print the SSID of the network you're attached to:
  // you're connected now, so print out the data
  Serial.print(F("You're connected to the network, IP = "));
  Serial.println(WiFi.localIP());

  Serial.print(F("SSID: "));
  Serial.print(WiFi.SSID());

  // print the received signal strength:
  int32_t rssi = WiFi.RSSI();
  Serial.print(F(", Signal strength (RSSI):"));
  Serial.print(rssi);
  Serial.println(F(" dBm"));
}

void setup()
{
  Serial.begin(115200);

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

  Serial.print(F("\nStarting WebServer 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);
  }

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

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

#endif

#endif

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

  status = WiFi.begin(ssid, pass);

  delay(1000);

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED)
  {
    delay(500);

    // Connect to WPA/WPA2 network
    status = WiFi.status();
  }

  printWifiStatus();

  // start the web server on port 80
  server.begin();
}

void loop()
{
  // listen for incoming clients
  WiFiClient client = server.available();

  if (client)
  {
    Serial.println(F("New client"));
    // an http request ends with a blank line
    bool currentLineIsBlank = true;

    while (client.connected())
    {
      if (client.available())
      {
        char c = client.read();
        Serial.write(c);

        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank)
        {
          Serial.println(F("Sending response"));

          // send a standard http response header
          // use \r\n instead of many println statements to speedup data send
          client.print(
            "HTTP/1.1 200 OK\r\n"
            "Content-Type: text/html\r\n"
            "Connection: close\r\n"  // the connection will be closed after completion of the response
            "Refresh: 20\r\n"        // refresh the page automatically every 20 sec
            "\r\n");
          client.print(F("<!DOCTYPE HTML>\r\n"));
          client.print(F("<html>\r\n"));
          client.print(F("<h1>Hello World from "));
          client.print(BOARD_NAME);
          client.print(F("!</h1>\r\n"));
          client.print(F("Requests received: "));
          client.print(++reqCount);
          client.print(F("<br>\r\n"));
          client.print(F("Analog input A0: "));
          client.print(analogRead(0));
          client.print(F("<br>\r\n"));
          client.print(F("</html>\r\n"));
          break;
        }

        if (c == '\n')
        {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r')
        {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }

    // give the web browser time to receive the data
    delay(10);

    // close the connection:
    client.stop();
    Serial.println(F("Client disconnected"));
  }
}