WebClientRepeating.ino

/****************************************************************************************************************************
  WebClientRepeating.ino - Dead simple AsyncWebServer for Teensy41 QNEthernet

  For Teensy41 with QNEthernet

  AsyncWebServer_Teensy41 is a library for the Teensy41 with QNEthernet

  Based on and modified from ESPAsyncWebServer (https://github.com/me-no-dev/ESPAsyncWebServer)
  Built by Khoi Hoang https://github.com/khoih-prog/AsyncWebServer_Teensy41
  Licensed under GPLv3 license
 *****************************************************************************************************************************/

#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 && millis() < 5000);

  Serial.print("\nStart WebClientRepeating on ");
  Serial.print(BOARD_NAME);
  Serial.print(" with ");
  Serial.println(SHIELD_TYPE);
  Serial.println(ASYNC_WEBSERVER_TEENSY41_VERSION);

  delay(500);

#if USING_DHCP
  // Start the Ethernet connection, using DHCP
  Serial.print("Initialize Ethernet using DHCP => ");
  Ethernet.begin();
#else
  // Start the Ethernet connection, using static IP
  Serial.print("Initialize Ethernet using static IP => ");
  Ethernet.begin(myIP, myNetmask, myGW);
  Ethernet.setDNSServerIP(mydnsServer);
#endif

  if (!Ethernet.waitForLocalIP(5000))
  {
    Serial.println(F("Failed to configure Ethernet"));

    if (!Ethernet.linkStatus())
    {
      Serial.println(F("Ethernet cable is not connected."));
    }

    // Stay here forever
    while (true)
    {
      delay(1);
    }
  }
  else
  {
    Serial.print(F("Connected! IP address:"));
    Serial.println(Ethernet.localIP());
  }

#if USING_DHCP
  delay(1000);
#else
  delay(2000);
#endif
}

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();
  }
}