gumball v2

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

// Give pin 13 a name
int led = 13;

// Local Network Settings
byte mac[] = { 0xD4, 0x28, 0xB2, 0xFF, 0xA0, 0xA1 }; // Must be unique on local network

// ThingSpeak Settings
char thingSpeakAddress[]       = "api.thingspeak.com";
String thingSpeakChannel       = "2738";                // Channel number looking for twitter update
String thingSpeakField         = "1";                   // Field number of the CheerLights commands
const int thingSpeakInterval   = 16 * 1000;             // Time interval in milliseconds to get data from ThingSpeak (number of seconds * 1000 = interval)

// Variable Setup
long lastConnectionTime  = 0;
String lastCommand       = "";
boolean lastConnected    = false;
int failedCounter        = 0;

// Initialize Arduino Ethernet Client
EthernetClient client;

void setup()
{

  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);

  // Setup Serial
  Serial.begin(9600);
  delay(100);

  Serial.flush();
  delay(100);

  // Start Ethernet on Arduino
  startEthernet();
}

void loop()
{

  if (client.available() > 0)
  {
    delay(100);

    String response;
    char charIn;

    do
    {
      charIn = client.read();
      response += charIn;
    }

    while(client.available() > 0);

    if (response.indexOf("gumball") > 0)
    {
        lastCommand = "gumball";
    }

     // Echo command
    delay(200);
    Serial.println("CheerLight Command Received: "+lastCommand);
    Serial.println();
    delay(200);

  }

  if (!client.connected() && lastConnected)
  {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
  }

   // Subscribe to ThingSpeak Channel and Field
  if(!client.connected() && (millis() - lastConnectionTime > thingSpeakInterval))
  {
    subscribeToThingSpeak(thingSpeakChannel, thingSpeakField);
  }

  // Check if Arduino Ethernet needs to be restarted
  if (failedCounter > 3 )
  {
    startEthernet();
  }

  lastConnected = client.connected();
}


void subscribeToThingSpeak(String tsChannel, String tsField)
{
  if (client.connect(thingSpeakAddress, 80))
  {
    Serial.println("Connecting to ThingSpeak...");
    Serial.println();

    failedCounter = 0;

    client.println("GET /channels/"+tsChannel+"/field/"+tsField+"/last.txt HTTP/1.0");
    client.println();

    lastConnectionTime = millis();
  }
  else
  {
    failedCounter++;

    Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")");
    Serial.println();

    lastConnectionTime = millis();
  }
}

void startEthernet()
{

  client.stop();

  Serial.println("Connecting Arduino to network...");
  Serial.println();

  delay(1000);

  // Connect to network amd obtain an IP address using DHCP
  if (Ethernet.begin(mac) == 0)
  {
    Serial.println("DHCP Failed, reset Arduino to try again");
    Serial.println();
  }
  else
  {
    Serial.println("Arduino connected to network using DHCP");
    Serial.println();
  }

  delay(1000);
}