An Amazon Dash-like button tied into IFTTT

ESP8266_Dash_Button.ino

/**
 * Simple IoT button using the If This Then That(IFTTT) Maker Channel, an 
 * ESP8266-01 and lit arcade button.
 * 
 * For connections advice:
 * http://iot-playground.com/2-uncategorised/38-esp8266-and-arduino-ide-blink-example
 */

#include <ESP8266WiFi.h>

/** Network Definitions */
const char* ssid     = "yourssid";
const char* password = "yourpassword";
const int   timeout  = 5;

/** IFTTT Definitions */
const char* ifttt_url   = "maker.ifttt.com";
const int   ifttt_port  = 80;
const char* ifttt_key   = "YOUR IFTTT_KEY";
const char* ifttt_event = "button";

/** Pin Definitions */
const int LED = 2;
const int button = 0;

/** Function Definitions */
void shutdown(unsigned int error) {
  // to cover shutting down
}

void setup(void) {
  
  pinMode (button, OUTPUT);
  digitalWrite(button, LOW); // hold on
  
  pinMode(LED, OUTPUT);
  digitalWrite(LED, HIGH);
  
  Serial.begin(115200);
  delay(10);
  
  Serial.println("\r\n\r\nButton pressed!");
  
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);
  int i;
  for(i = 0; i < timeout; i++)
  {
    delay(500);
    if(WiFi.status() != WL_CONNECTED) break;
    else Serial.print('.');
  }
  Serial.println();
  if(i == timeout)
  {
    Serial.println("Connection to WiFi failed!");
    digitalWrite(button, HIGH); // release
    while(1);
  }
  
  Serial.println("Triggering IFTTT event...");
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(ifttt_url, ifttt_port)) {
    Serial.println("Connection to IFTTT failed!");
    digitalWrite(button, HIGH); // release
    while(1);
  }
  
  String url = "/trigger/" + String(ifttt_event) + "/with/key/" + String(ifttt_key);
  
  // Set some values for the JSON data
  IPAddress ip = WiFi.localIP();
  unsigned char mac[WL_MAC_ADDR_LENGTH];
  WiFi.macAddress(mac);
  
  String value_1 = String(mac[0], HEX) + ':' + String(mac[1], HEX) + ':' + String(mac[2], HEX) + ':' + String(mac[3], HEX) + ':' + String(mac[4], HEX) + ':' + String(mac[5], HEX);
  String value_2 = String(ip[0]) + '.' + String(ip[1]) + '.' + String(ip[2]) + '.' + String(ip[3]);
  String value_3 = String(WiFi.gatewayIP()); // drop?
  
  // Build JSON data string
  String data = "";
  data = data + "\n" + "{\"value1\":\""+ value_1 +"\",\"value2\":\""+ value_2 +"\",\"value3\":\""+ value_3 + "\"}"
  
   
  // Sent HTTP POST Request with JSON data
  client.println("POST "+ url +" HTTP/1.1");
  //Serial.println("POST "+ url +" HTTP/1.1");
  client.println("Host: "+ String(ifttt_url));
  //Serial.println("Host: "+ String(ifttt_url));
  client.println("User-Agent: Arduino/1.0");
  //Serial.println("User-Agent: Arduino/1.0");
  client.print("Accept: *");
  //Serial.print("Accept: *");
  client.print("/");
  //Serial.print("/");
  client.println("*");
  //Serial.println("*");
  client.print("Content-Length: ");
  //Serial.print("Content-Length: ");
  client.println(data.length());
  //Serial.println(data.length());
  client.println("Content-Type: application/json");
  //Serial.println("Content-Type: application/json");
  client.println("Connection: close");
  //Serial.println("Connection: close");
  client.println();
  //Serial.println();
  client.println(data);
  //Serial.println(data);
  
  // any feedback, success or failure?
  
  // flash LED appropreately
  
  
  WiFi.disconnect();
  // end
  digitalWrite(button, HIGH); // release
  while(1);
  
}

void loop(void) {
  // should never get to this point
  digitalWrite(button, HIGH); // release
  while(1);
}