Get response from telnet server with putty, but not with Arduino telnet client

Projects Networking, Protocols, and Devices
2

I think you need to wait for the telnet server to respond. With no real error checking, this should show the login prompt.

void setup() {
  Ethernet.begin(mac, ip);
  Serial.begin(9600);

  delay(1000);
  Serial.println("connecting...");

  if (client.connect(server, 23)) {
    Serial.println("connected");

  // wait for a response. This should also check client.connected() and a timeout.
  while(client.available() == 0) delay(1);

  // get the response
  while (client.available() > 0) {
      char c = client.read();
      Serial.print(c);
    }
  }
  else {
    Serial.println("connection failed");
  }
}