telnet access to a coffeemachine using arduino

telnetcoffee.pde

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

// enter mac, ip, gateway and subnet mask
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,2, 177);
IPAddress gateway(192,168,2, 1);
IPAddress subnet(255, 255, 255, 0);

// telnet server on port 23
EthernetServer server(23);
// whenever a message is received
boolean gotAMessage = false;
// the request
String request = "";

void setup()
{
  // initialize the ethernet device
  Ethernet.begin(mac, ip, gateway, subnet);
  // start listening for clients
  server.begin();
  // open the serial port
  Serial.begin(9600);
}

void loop() {
  // wait for a new client
  EthernetClient client = server.available();
  boolean currentLineIsBlank = true;
  
  if (client) {
    // when the clients opens the telnet connection ask him for coffee
    if (!gotAMessage) {
      Serial.println("New coffee client");
      client.println("Do you want some coffe?"); 
      gotAMessage = true;
    }

    char c = client.read();
    Serial.println(request);

    // handle the request
    handleRequest(request, client);

    if (c == '\n') {
      // a new line was started
      Serial.println("newline");
      currentLineIsBlank = true;
      request = "";
    } 
    else if (c != '\r') {
      // received a character on the line
      Serial.println(c);
      currentLineIsBlank = false;
      request += c;
    }
    delay(1);
  }
}

void handleRequest(String command, EthernetClient c)
{
  if(request.endsWith("exit"))
  {
    c.println("bye");
    c.stop(); 
    request = "";
  }

  if(request.endsWith("yes"))
  {
    c.println("making some coffee");

    // servo to 160° and back to 10°
    // this will push the button ond the coffeemachine
    Servo servo;
    servo.attach(8);
    servo.write(160);
    delay(1000);
    servo.write(10);

    // wait some seconds
    for(int t = 0; t < 12; t++)
    {
      c.print("#");
      delay(1000);
    }

    c.println("");
    c.println("coffe is finished");
    delay(100);
    c.stop(); 
    request = "";
  }

  if(request.endsWith("no"))
  {
    c.println("bye");
    c.stop(); 
    request = "";
  }
}