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Characteristics
802.11 b / g / n 
Wi-Fi Direct (P2P), soft-AP 
Built-in TCP / IP protocol stack 
Built-in TR switch, balun, LNA, power amplifier and matching network 
Built-in PLL, voltage regulator and power management components 
802.11b mode + 19.5dBm output power 

>>>   Built-in temperature sensor   <<<

Support antenna diversity 
off leakage current is less than 10uA 

>>> Built-in low-power 32-bit CPU: can double as an application processor  <<<

SDIO 2.0, SPI, UART 
STBC, 1x1 MIMO, 2x1 MIMO 
A-MPDU, A-MSDU aggregation and the 0.4 Within wake 
2ms, connect and transfer data packets 
standby power consumption of less than 1.0mW (DTIM3) 

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AT+CWMODE  wifi mode  wifi  AT+CWMODE=<mode> AT+CWMODE?  AT+CWMODE=?  1= Sta, 2= AP, 3=both  

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Xtensa_Info HW_CONFIGID0=0xc28cdafa
HW_CONFIGID1=0x1082b6f6
BUILD_UNIQUE_ID=0x0002b6f6
ABI=1
USE_ABSOLUTE_LITERALS=0
HW_VERSION="LX3.0.1"
HW_MIN_VERSION_MAJOR=2300
HW_MIN_VERSION_MINOR=1
HW_MAX_VERSION_MAJOR=2300
HW_MAX_VERSION_MINOR=1
RELEASE_NAME="RC-2010.1"
RELEASE_VERSION="8.0.1"
RELEASE_MAJOR=8000
RELEASE_MINOR=1
CORE_NAME="lx106"
..

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#ifndef __USER_WEBSERVER_H__
#define __USER_WEBSERVER_H__

#define SERVER_PORT 80

#define URLSize 10

typedef enum Result_Resp {
    RespFail = 0,
    RespSuc,
} Result_Resp;

typedef enum ProtocolType {
    GET = 0,
    POST,
} ProtocolType;

typedef enum _ParmType {
    SWITCH_STATUS = 0,
    INFOMATION,
    WIFI,
    SCAN,
    REBOOT,
    LIGHT_STATUS,
} ParmType;

typedef struct URL_Frame {
    enum ProtocolType Type;
    char pSelect[URLSize];
    char pCommand[URLSize];
    char pFilename[URLSize];
} URL_Frame;

typedef struct _rst_parm {
    ParmType parmtype;
    struct espconn *pespconn;
} rst_parm;

void user_webserver_init(uint32 port);

#endif

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{
  dport0_0_seg :                        org = 0x3FF00000, len = 0x10
  dram0_0_seg :                         org = 0x3FFE8000, len = 0x14000
  iram1_0_seg :                         org = 0x40100000, len = 0x8000
  irom0_0_seg :                         org = 0x40240000, len = 0x32000
}

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    #include <SoftwareSerial.h>
    #define SSID "xxxxxxxx"
    #define PASS "xxxxxxxx"
    #define DST_IP "220.181.111.85" //baidu.com
    SoftwareSerial dbgSerial(10, 11); // RX, TX
    void setup()
    {
    // Open serial communications and wait for port to open:
    Serial.begin(57600);
    Serial.setTimeout(5000);
    dbgSerial.begin(9600); //can't be faster than 19200 for softserial
    dbgSerial.println("ESP8266 Demo");
    //test if the module is ready
    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);
    //connect to the wifi
    boolean connected=false;
    for(int i=0;i<5;i++)
    {
    if(connectWiFi())
    {
    connected = true;
    break;
    }
    }
    if (!connected){while(1);}
    delay(5000);
    //print the ip addr
    /*Serial.println("AT+CIFSR");
    dbgSerial.println("ip address:");
    while (Serial.available())
    dbgSerial.write(Serial.read());*/
    //set the single connection mode
    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);
    //Serial.find("+IPD");
    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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/* A simple server in the internet domain using TCP
   The port number is passed as an argument */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h> 
#include <sys/socket.h>
#include <netinet/in.h>

void error(const char *msg)
{
    perror(msg);
    exit(1);
}

int main(int argc, char *argv[])
{
     int sockfd, newsockfd, portno;
     socklen_t clilen;
     char buffer[256];
     struct sockaddr_in serv_addr, cli_addr;
     int n;
     if (argc < 2) {
         fprintf(stderr,"ERROR, no port provided\n");
         exit(1);
     }
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0) 
        error("ERROR opening socket");
     bzero((char *) &serv_addr, sizeof(serv_addr));
     portno = atoi(argv[1]);
     serv_addr.sin_family = AF_INET;
     serv_addr.sin_addr.s_addr = INADDR_ANY;
     serv_addr.sin_port = htons(portno);
     if (bind(sockfd, (struct sockaddr *) &serv_addr,
              sizeof(serv_addr)) < 0) 
              error("ERROR on binding");
     
     listen(sockfd,5);
     clilen = sizeof(cli_addr);
     newsockfd = accept(sockfd, 
                 (struct sockaddr *) &cli_addr, 
                 &clilen);
     if (newsockfd < 0) 
          error("ERROR on accept");
     
     do {
       bzero(buffer,256);
       n = read(newsockfd,buffer,255);
       if (n < 0) error("ERROR reading from socket");
       printf("Here is the message: %s\n",buffer);
       n = write(newsockfd,"I got your message",18);
       if (n < 0) error("ERROR writing to socket");
     } while(1);

     close(newsockfd);
     close(sockfd);
     return 0; 
}

 

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reset and Info to Modul:
AT+RST

setting as Station:
AT+CWMODE=1

connect to Router:
AT+CWJAP="ssid","passwort"

get DHCP IP Adresse :
AT+CIFSR

start TCP-Server ( Linux Server Code Top ) in a console 
server <port>

multi conn:
AT+CIPMUX=1

connect with the Server:
AT+CIPSTART=4,"TCP","xxx.xxx.xxx.xxx",<port>

Send 10 chars:
AT+CIPSEND=4,10

send more chars - connection would be online ...
AT+CIPSEND=4,<counts>

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 

void error(const char *msg)
{
    perror(msg);
    exit(0);
}

int main(int argc, char *argv[])
{
    int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    char buffer[256];
    if (argc < 3) {
       fprintf(stderr,"usage %s hostname port\n", argv[0]);
       exit(0);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) 
        error("ERROR opening socket");
    server = gethostbyname(argv[1]);
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, 
         (char *)&serv_addr.sin_addr.s_addr,
         server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) 
        error("ERROR connecting");
    
    do {
    printf("Please enter the message: ");
    bzero(buffer,256);
    fgets(buffer,255,stdin);
    n = write(sockfd,buffer,strlen(buffer));
    } while (1);
    if (n < 0) 
         error("ERROR writing to socket");
    bzero(buffer,256);
    n = read(sockfd,buffer,255);
    if (n < 0) 
         error("ERROR reading from socket");
    printf("%s\n",buffer);
    
    close(sockfd);
    return 0;
}

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ESP8266 Modul now Server:

reset and Info to Modul:
AT+RST

Set as Station:
AT+CWMODE=1

Connect with Router :
AT+CWJAP="ssid","password"

Get IP over DHCP:
AT+CIFSR

multi conn:
AT+CIPMUX=1

Start ESP8266 Modul as Server:
AT+CIPSERVER=1,8888

at console , start the client and write Text..
echo at Modul over UART
If client closed, Server waits for new connection.