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Ethernet : Client class
Whether or not the client is connected. Note that a client is considered connected if the connection has been closed but there is still unread data.
client.connected()
none
Returns true if the client is connected, false if not.
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 10, 0, 0, 177 };
byte server[] = { 64, 233, 187, 99 }; // Google
Client client(server, 80);
void setup()
{
  Ethernet.begin(mac, ip);
  Serial.begin(9600);
  delay(1000);
  Serial.println("connecting...");
  if (client.connect()) {
    Serial.println("connected");
    client.println("GET /search?q=arduino HTTP/1.0");
    client.println();
  } else {
    Serial.println("connection failed");
  }
}
void loop()
{
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    for(;;)
      ;
  }
}
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