Arduino and ESP8266 Basic Programming

Overview
ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
ESP8266 has powerful on-board processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area.

Source Code
SoftwareSerial library is needed.

#include <SoftwareSerial.h>
#define SSID "xxxxxxxx"
#define PASS "xxxxxxxx"
#define DST_IP "220.181.111.85"
SoftwareSerial dbgSerial(10, 11); // RX, TX
void setup()
{
  Serial.begin(57600);
  Serial.setTimeout(5000);
  dbgSerial.begin(9600); //can't be faster than 19200 for softserial
  dbgSerial.println("ESP8266 Demo");
  Serial.println("AT+RST");
  delay(1000);
  if (Serial.find("ready"))
  {
    dbgSerial.println("Module is ready");
  }
  else
  {
    dbgSerial.println("Module have no response.");
    while (1);
  }
  delay(1000);
  boolean connected = false;
  for (int i = 0; i < 5; i++)
  {
    if (connectWiFi())
    {
      connected = true;
      break;
    }
  }
  if (!connected) {
    while (1);
  }
  delay(5000);
  /*Serial.println("AT+CIFSR");
  dbgSerial.println("ip address:");
  while (Serial.available())
  dbgSerial.write(Serial.read());*/
  Serial.println("AT+CIPMUX=0");
}
void loop()
{
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += DST_IP;
  cmd += "\",80";
  Serial.println(cmd);
  dbgSerial.println(cmd);
  if (Serial.find("Error")) return;
  cmd = "GET / HTTP/1.0\r\n\r\n";
  Serial.print("AT+CIPSEND=");
  Serial.println(cmd.length());
  if (Serial.find(">"))
  {
    dbgSerial.print(">");
  }
  else
  {
    Serial.println("AT+CIPCLOSE");
    dbgSerial.println("connect timeout");
    delay(1000);
    return;
  }
  Serial.print(cmd);
  delay(2000);
  while (Serial.available())
  {
    char c = Serial.read();
    dbgSerial.write(c);
    if (c == '\r') dbgSerial.print('\n');
  }
  dbgSerial.println("====");
  delay(1000);
}
boolean connectWiFi()
{
  Serial.println("AT+CWMODE=1");
  String cmd = "AT+CWJAP=\"";
  cmd += SSID;
  cmd += "\",\"";
  cmd += PASS;
  cmd += "\"";
  dbgSerial.println(cmd);
  Serial.println(cmd);
  delay(2000);
  if (Serial.find("OK"))
  {
    dbgSerial.println("OK, Connected to WiFi.");
    return true;
  }
  else
  {
    dbgSerial.println("Can not connect to the WiFi.");
    return false;
  }
}

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