Arduino Net

Ethernet request on Arduino

This tutorial will walk you through how to make a ethernet request with Arduino.

For more see https://arduinogetstarted.com/tutorials/arduino-http-request.

Arduino Ethernet Shield

The Ethernet Shield can be bought on Amazon.

Shields are built for the Arduino Uno but can be used on any Arduino.

Shields just sit on top the Arduino connecting the corresponding pins.

Steps

1. Put Shield on Arduino
2. Plug Ethernet cord into Shield
3. Plug the Arduino into Computer
4. Upload needed code (see below)
5. Open Serial Monitor and view output
6. View network traffic on WireShark

The Needed Code

/*Arduino Http Request */

#include <SPI.h>
#include <Ethernet.h>

// replace the MAC address below by the MAC address printed on a sticker on the Arduino Shield 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

EthernetClient client;

int    HTTP_PORT   = 80;
String HTTP_METHOD = "GET"; // or POST
char   HOST_NAME[] = "maker.ifttt.com";
String PATH_NAME   = "/trigger";

void setup() {
  Serial.begin(9600);
  request();
}

void loop() {}

void request() {
  // initialize the Ethernet shield using DHCP:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to obtaining an IP address using DHCP");
    while(true);
  }

  // connect to web server on port 80:
  if(client.connect(HOST_NAME, HTTP_PORT)) {
    // if connected:
    Serial.println("Connected to server");
    // make a HTTP request:
    // send HTTP header
    client.println(HTTP_METHOD + " " + PATH_NAME + " HTTP/1.1");
    client.println("Host: " + String(HOST_NAME));
    client.println("Connection: close");
    client.println(); // end HTTP header

    while(client.connected()) {
      if(client.available()){
        // read an incoming byte from the server and print it to serial monitor:
        char c = client.read();
        Serial.print(c);
      }
    }

    // the server's disconnected, stop the client:
    client.stop();
    Serial.println();
    Serial.println("disconnected");
  } else {// if not connected:
    Serial.println("connection failed");
  }
}