Page 373 - 최강 아두이노 퍼스트 참고서

// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google
(no DNS)
char server[] = "www.google.com"; // name address for
Google (using DNS)

// Set the static IP address to use if the DHCP fails to
assign
IPAddress ip(192, 168, 0, 177);

// 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 native
USB port only
}

// start the Ethernet connection:
// DHCP ip 할당을 먼저 시도합니다.
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using
DHCP");
// try to congifure using IP address instead of DHCP:
// DHCP 할당이 안되는 경우 지정된 ip 로 지정해서 합니다.
Ethernet.begin(mac, ip);
}
// 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, 80)) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();
} else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
}
}

void loop() {

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