Esp8266wi fi data communication

summary ：

1. This paper mainly introduces the short-range communication field in the development of Sensor Networks Wi-Fi Communications

2. Through this study, you can master ESP8266 Wi-Fi Working mode ;

3. master ESP8266 Wi-Fi Communication module AT Instructions ;

4.TCP Connection method and data transmission ;

Wi-Fi Technical introduction

        Wi-Fi This term is commonly mistaken for Wireless fidelity （Wireless Fidelity） In WLAN, it refers to “ Wireless Compatibility Certification ”, In essence, it is a kind of commercial certification , It is also a wireless networking technology , Like Bluetooth Technology , Both belong to the short-range wireless technology used in the office and home . Compared with Bluetooth Technology , It has a higher transmission rate , Longer transmission distance , Widely used in mobile phones 、 The notebook 、 Automobile and other products .

ESP8266Wi-Fi Introduction to communication module

       ESP8266 The biggest feature of the chip is its high cost performance ,ESP8266 The chip scheme is a complete system Wi-Fi Solution , It can carry software applications or uninstall all through another application processor Wi-Fi Network function .

       ESP8266 It can be done by GPIO Port integrated sensors and other specific devices , Realize the minimum resource occupation in the early development and operation .ESP8266 Highly integrated on-chip , Including wireless switch balun、 Power management converter 、 Therefore, only a few external circuits are needed , When the design PCB Minimize resources .

        ESP8266 There is a set of software development kit （SDK） The SDK It provides users with a set of data receiving function interfaces , Users don't have to care about the underlying network , Focus on the upper development of the Internet of things , Use the corresponding interface to complete the corresponding network data sending and receiving .

ESP8266Wi-Fi Communication working mode

ESP8266 There are three working modes ：station、soft-AP、station+soft-AP Pattern .

station Pattern ： The module is equivalent to a router connecting to the Internet , Mobile phones are controlled through the Internet .

soft-AP：ESP8266 As a hot spot , Realize the communication between mobile computer and module , Wireless LAN control

station+soft-AP Pattern ： Two modes coexist , It can be controlled by the Internet , It can also be controlled by LAN , It is generally used in network communication in the host of master-slave relationship , Communication .

To configure Wi-Fi AP Working mode

（ One ） Use FLASH_DOWNLOAD_TOOLS_v2.4_150924( It is recommended to use ) Tool burning Wi-Fi Module firmware

 （ Two ） Turn on the serial assistant , Choose the right one COM mouth , set baud rate 115200, Data bits 8, Check bit None, Stop bit 1, Flow control none , Input "AT" Click send to return OK It indicates that the module is normal

 （ 3、 ... and ）AT+CWMODE=2, Set up AP Working mode    1：station  2：softAP 3：station+ softAP

        ( The module and the connected network need to be disconnected before configuration )

 （ 3、 ... and ）AT+CWDHCP=0,1; Set the module on AP In mode DHCP function

( Four ) Restart the module AT+RST

 （ 5、 ... and ）AT+CWSAP_CUR=” Wireless name ”, ” password ”,” Hot channel ”,” encryption ”. The corresponding relationship of encryption method is as follows 0：OPEN 1: WEP 2: WPA_PSK 3: WPA2_PSK,4: WPA_WPA2_PSK.

 （ 6、 ... and ）AT+CIPAP=”IP” Set up ESP8266IP Address , This setting will not be saved FLASH,AT+CIPAP？ Inquire about IP

 （ 7、 ... and ）AT+CIPMUX=1 start-up AP Multi connection support client ID Number 0-4

 （ 8、 ... and ）AT+CIPSERVER=1,8080 Start server mode

（ Nine ）AT+CIFSR see IP Address and MAC Address

  To configure Wi-FiStation Pattern

（ One ） send out AT+CWMODE=2; Set up station Pattern

（ Two ）AT+CWDHCP=1,1;station Pattern , obtain DHCP

 （ 3、 ... and ） Restart the module AT+RST

（ Four ）AT+CWLAP  scanning AP list

 （ 5、 ... and ）AT+CWJAP? Query the connected hotspot instructions   AT+CWQAP Disconnect hotspot command

 （ 6、 ... and ）AT+CWJAP="China mobile","12345678" Connect AP

  To configure Wi-Fi station+soft-AP Pattern

（ One ） send out AT+CWMODE=3; Set up station+soft-AP Pattern

 （ Two ）AT+CWDHCP=2,1;station+soft-AP Pattern , obtain DHCP

 （ 3、 ... and ） Restart the module AT+RST

（ Four ）AT+CWJAP="China mobile","12345678" Connect AP

（ 5、 ... and ）AT+CWSAP_CUR=” Wireless name ”, ” password ”,” Hot channel ”,” encryption ”. To configure ESP8266 hot spot information

            AT+CWSAP？ View hotspot information

          The mobile phone can search the hotspot information to connect

 （ 6、 ... and ）AT+CIPAP=”IP” Set up ESP8266IP Address , This setting will not be saved FLASH    Read information AT+CIPAP？

（ 7、 ... and ）AT+CIPMUX=1 start-up AP Multi connection support client ID Number 0-4

（ 8、 ... and ）AT+CIPSERVER=1,8080 Start server mode , Support ID Number 0-1 0 Single chain road 1 Multiple links .

（ Nine ）AT+CIFSR see IP Address and MAC Address

  Use the mobile phone to connect the module , thus Wi-Fi Three basic configurations are completed , The next article explains Wi-Fi Data communication reporting cloud platform .