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Author Topic: Setting up web client to local server on Mac OSX (direct connection)  (Read 943 times)
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Hi there,

I have an Arduino Uno w. Ethernet Shield running a slightly modified version of the demo WebClient sketch. I am wanting to connect to a server running locally on my macbook (running Mountain Lion), which is what I am also connecting the ethernet cable to. I have been able to connect to the server using it's local IP address (The code below is what I have used to do this), which would be going through my home router. However, I would like to be able to connect to this server without any network connection at all (for easy demonstration purposes).

Note that I am using DHCP, but I don't require this. Although I can't seem to get DHCP working unless I have a network connection.

My feeling is I'll have to set up some kind of virtual gateway, but at this stage am a bit lost. I would appreciate a bit of direction.

Code:
/*
  Web client
 
 This sketch connects to a website (http://www.google.com)
 using an Arduino Wiznet Ethernet shield.
 
 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13
 
 created 18 Dec 2009
 modified 9 Apr 2012
 by David A. Mellis
 
 */

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

// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server(192,168,0,3); // Google

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;

void setup() {
 // Open serial communications and wait for port to open:
  Serial.begin(9600);

   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  // start the Ethernet connection:
  Serial.println("Setting up Ethernet");
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    for(;;)
      ;
  }
  Serial.println("Success!");
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 5000)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("GET /home HTTP/1.0");
    client.println();
  }
  else {
    // kf you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

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

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for(;;)
      ;
  }
}

Thanks,
Doug.
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SE USA
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you need a crossover cable (or a hub/switch) and hard set the ip address on both the arduino and your computer
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