WebClientRepeating_ESP.ino

/****************************************************************************************************************************
  WebClientRepeating_ESP.ino

  Ethernet_Generic is a library for the W5x00 Ethernet shields trying to merge the good features of
  previous Ethernet libraries

  Built by Khoi Hoang https://github.com/khoih-prog/Ethernet_Generic
 *****************************************************************************************************************************/

// Important: For ESP32, check https://github.com/khoih-prog/EthernetWebServer#7-for-fixing-esp32-compile-error
// and replace cores/esp32/Server.h to avoid compile error

#include "defines.h"

char server[] = "arduino.tips";

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 Ethernet 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.tips"));
    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()
{
  Serial.begin(115200);

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

  delay(200);

  Serial.print("\nStarting WebClientRepeating_ESP on ");
  Serial.print(ARDUINO_BOARD);
  Serial.print(" with ");
  Serial.println(SHIELD_TYPE);
  Serial.println(ETHERNET_GENERIC_VERSION);

#if defined(ESP8266)
  // For ESP8266, change for other boards if necessary
#ifndef USE_THIS_SS_PIN
#define USE_THIS_SS_PIN   D2    // For ESP8266
#endif

  ETG_LOGWARN1(F("ESP8266 setCsPin:"), USE_THIS_SS_PIN);

  // For ESP8266
  // Pin                D0(GPIO16)    D1(GPIO5)    D2(GPIO4)    D3(GPIO0)    D4(GPIO2)    D8
  // Ethernet_Generic   X                 X            X            X            X        0
  // D2 is safe to used for Ethernet_Generic libs
  //Ethernet.setCsPin (USE_THIS_SS_PIN);
  Ethernet.init (USE_THIS_SS_PIN);

#elif defined(ESP32)

  // You can use Ethernet.init(pin) to configure the CS pin
  //Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet

#ifndef USE_THIS_SS_PIN
#define USE_THIS_SS_PIN   5   //22    // For ESP32
#endif

  ETG_LOGWARN1(F("ESP32 setCsPin:"), USE_THIS_SS_PIN);

  // Must use library patch for Ethernet, EthernetLarge libraries
  // ESP32 => GPIO2,4,5,13,15,21,22 OK with Ethernet, Ethernet2, EthernetLarge
  // ESP32 => GPIO2,4,5,15,21,22 OK with Ethernet3

  //Ethernet.setCsPin (USE_THIS_SS_PIN);
  Ethernet.init (USE_THIS_SS_PIN);

#endif    // defined(ESP8266)

  // start the ethernet connection and the server:
  // Use DHCP dynamic IP and random mac
  uint16_t index = millis() % NUMBER_OF_MAC;
  // Use Static IP
  //Ethernet.begin(mac[index], ip);
  Ethernet.begin(mac[index]);

#if defined( ESP32 )
  // Just info to know how to connect correctly
  // To change for other SPI
  Serial.println("=========================");
  Serial.println("Currently Used SPI pinout:");
  Serial.print("MOSI:");
  Serial.println(PIN_MOSI);
  Serial.print("MISO:");
  Serial.println(PIN_MISO);
  Serial.print("SCK:");
  Serial.println(PIN_SCK);
  Serial.print("SS:");
  Serial.println(USE_THIS_SS_PIN);
  Serial.println(F("========================="));
#endif

  Serial.print(F("Using mac index = "));
  Serial.println(index);

  Serial.print(F("Connected! IP address: "));
  Serial.println(Ethernet.localIP());

  if ( (Ethernet.getChip() == w5500) || (Ethernet.getChip() == w6100) || (Ethernet.getAltChip() == w5100s) )
  {
    if (Ethernet.getChip() == w6100)
      Serial.print(F("W6100 => "));
    else if (Ethernet.getChip() == w5500)
      Serial.print(F("W6100 => "));
    else
      Serial.print(F("W5100S => "));
    
    Serial.print(F("Speed: "));
    Serial.print(Ethernet.speedReport());
    Serial.print(F(", Duplex: "));
    Serial.print(Ethernet.duplexReport());
    Serial.print(F(", Link status: "));
    Serial.println(Ethernet.linkReport());
  }

  Serial.println();
  Serial.println(F("Starting connection to server..."));
}

void printoutData()
{
  // if there are incoming bytes available
  // from the server, read them and print them
  while (client.available())
  {
    char c = client.read();
    Serial.write(c);
    Serial.flush();
  }
}

void loop()
{
  // if there's incoming data from the net connection send it out the serial port
  // this is for debugging purposes only
  printoutData();

  // if 10 seconds have passed since your last connection,
  // then connect again and send data
  if ( (lastConnectionTime == 0) || (millis() - lastConnectionTime > postingInterval) )
  {
    httpRequest();
  }
}