WebClientRepeating.ino

/****************************************************************************************************************************
  WebClientRepeating.ino - Dead simple AsyncWebServer for STM32 LAN8720 or built-in LAN8742A Ethernet
  
  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 MIT 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"

char server[] = "arduino.cc";

unsigned long lastConnectionTime = 0;         // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10000L; // delay between updates, in milliseconds

// Initialize the Web client object
EthernetClient client;

// this method makes a HTTP connection to the server
void httpRequest()
{
  Serial.println();

  // close any connection before send a new request
  // this will free the socket on the WiFi shield
  client.stop();

  // if there's a successful connection
  if (client.connect(server, 80))
  {
    Serial.println(F("Connecting..."));

    // send the HTTP PUT request
    client.println(F("GET /asciilogo.txt HTTP/1.1"));
    client.println(F("Host: arduino.cc"));
    client.println(F("Connection: close"));
    client.println();

    // note the time that the connection was made
    lastConnectionTime = millis();
  }
  else
  {
    // if you couldn't make a connection
    Serial.println(F("Connection failed"));
  }
}

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial);

  Serial.print("\nStart WebClientRepeating 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]);

  // you're connected now, so print out the data
  Serial.print(F("You're connected to the network, IP = "));
  Serial.println(Ethernet.localIP());
}

void loop()
{
  // if there's incoming data from the net connection send it out the serial port
  // this is for debugging purposes only
  while (client.available())
  {
    char c = client.read();
    Serial.write(c);
  }

  // if 10 seconds have passed since your last connection,
  // then connect again and send data
  if (millis() - lastConnectionTime > postingInterval)
  {
    httpRequest();
  }
}