Espressif Systems ESP8266 At Instruction Set
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Espressif Systems ESP8266 At Instruction Set

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ESP8266 AT Instruction Set
Version 2.0.0
Espressif Systems IoT Team
©
Copyright
2016

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Summary of Contents for Espressif Systems ESP8266

  • Page 1 ESP8266 AT Instruction Set Version 2.0.0 Espressif Systems IoT Team © Copyright 2016...
  • Page 2 The WiFi Alliance Member Logo is a trademark of the WiFi Alliance. All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged. Copyright © 2016 Espressif Systems. All rights reserved.
  • Page 3 About This Guide This document provides AT commands list based on ESP8266_NONOS_SDK. The document is structured as follows. Chapter Title Subject Chapter 1 Preambles Instructions on user-define AT command and downloading. Chapter 2 Command Description Basic description of AT commands. Chapter 3 Basic AT Commands List basic function AT commands.

  • Page 4: Table Of Contents

    .......... 10. AT+SLEEP – sleep mode ................ 11. AT+WAKEUPGPIO – set a GPIO to wake ESP8266 up from light-sleep mode 18 12. AT+RFPOWER – set maximum value of RF TX Power ......13. AT+RFVDD – set RF TX Power according to VDD33 .......
  • Page 5 .......... 16. AT+CWDHCP_DEF – Enable/Disable DHCP and save to flash ....17. AT+CWDHCPS_CUR – Set the IP address allocated by ESP8266 soft-AP DHCP, does not save to flash ..................18. AT+CWDHCPS_DEF – Set the IP address allocated by ESP8266 soft-AP DHCP, save to flash...
  • Page 6 33. AT+CWSTOPSMART – stop SmartConfig ..........34. AT+CWSTARTDISCOVER – Start the mode that ESP8266 can be found by WeChat ... 35. AT+CWSTOPDISCOVER – Stop the mode that ESP8266 can be found by WeChat ..36. AT+WPS – Set WPS function ..............
  • Page 7 ESP8266 Espressif Systems AT Instruction Set " " " Q&A ......................Espressif Systems 4 73 Friday, July 15, 2016...

  • Page 8: Preambles

    Please use only letters when naming user-defined AT commands. The AT command name must NOT contain characters or numbers. AT firmware is based on the ESP8266_NONOS_SDK. Espressif Systems AT commands are provided in libat.a. In the example of \ESP8266_NONOS_SDK\examples\at\user\user_main.c, ways are delivered on how to implement a custom, user-defined AT Command, "...

  • Page 9: Downloading At Firmware Into Flash

    ESP8266 Espressif Systems AT Instruction Set " " " Please refer to ESP8266_Getting_Started_Guide for instructions on compiling applications. 1.2. Downloading AT firmware into Flash Refer to ESP8266_NONOS_SDK\bin\at\readme.txt for instructions on how to download AT firmware into Flash. Please use Espressif official Flash download tool and select corresponding Flash size to download the firmware.

  • Page 10: Mbit Flash, Map: 512Kb + 512Kb

    ESP8266 Espressif Systems AT Instruction Set " " " Address Description 0xFB000 Initialize RF_CAL parameter area blank.bin 0xFC000 Stores default RF parameter values, has to be downloaded into esp_init_data_default.bin flash at least once. If the RF_CAL parameter area is initialized, this bin has to be downloaded too.

  • Page 11: Mbit Flash, Map: 512Kb + 512Kb

    ESP8266 Espressif Systems AT Instruction Set " " " Address Description 0x1FC000 Stores default RF parameter values, has to be downloaded into esp_init_data_default.bin flash at least once. If the RF_CAL parameter area is initialized, this bin has to be downloaded too.
  • Page 12 , so only one task of priority 2 is allowed system_os_task to be set up by the user. • AT returns messages below to show status of Wi-Fi connection of ESP8266 station ‣ WiFi CONNECTED - Wi-Fi connected ‣ WiFi GOT IP - ESP8266 station got IP from AP ‣...

  • Page 13: Command Description

    ESP8266 Espressif Systems AT Instruction Set " " " Command Description Each Command set contains four types of AT commands. Type Command Format DescrIPtion Query the Set command or internal parameters and its Test AT+<x>=? range values. Query AT+<x>? Returns the current value of the parameter.

  • Page 14: Basic At Commands

    " " Basic AT Commands 3.1. Overview The ESP8266 wireless Wi-Fi modules can be driven via the serial interface using the standard AT commands. Here is a list of some basic AT commands that can be used. Basic Command Description...

  • Page 15: Commands

    ESP8266 Espressif Systems AT Instruction Set " " " 3.2. Commands AT – Test AT startup The type of this command is "executed". It is used to test the setup function of your wireless Wi-Fi module. AT – Test AT startup...

  • Page 16: At+Gslp - Enter Deep-Sleep Mode

    The time unit of <time> is ms. Parameters ESP8266 will wake up after deep sleep <time> ATE – AT commands echo This command ATE is an AT trigger command echo. It means that entered commands can be echoed back to the sender when ATE command is used. Two parameters are possible. The command returns "OK"...

  • Page 17: At+Uart - Uart Configuration

    ESP8266 Espressif Systems AT Instruction Set " " " AT+UART – UART configuration This command sets the UART configuration and writes the new configuration to the flash. It is stored as the default parameter and will also be used as the default baudrate henceforth. [THIS API IS DEPRECATED.]...

  • Page 18: At+Uart_Cur - Current Uart Configuration

    ESP8266 Espressif Systems AT Instruction Set " " " AT+UART_CUR – current UART configuration This command sets the current UART configuration, it does not write changes to the flash. Hence there is no change in the default baud rate. AT+UART_CUR=<baudrate>, <databits>, <stopbits>, <parity>, <flow control>...

  • Page 19: At+Uart_Def - Default Uart Configuration

    ESP8266 Espressif Systems AT Instruction Set " " " AT+UART_DEF – default UART configuration This command sets the UART configuration and saves it to flash. It is stored as the default parameter and will also be used as the default baud rate henceforth.

  • Page 20: At+Sleep - Sleep Mode

    AT Instruction Set " " " 10. AT+SLEEP – sleep mode This command sets ESP8266 sleep mode. It can only be used in station mode. Modem sleep is the default sleep mode. AT+SLEEP – sleep mode Command AT+SLEEP? +SLEEP : <sleep mode>...

  • Page 21: At+Wakeupgpio - Set A Gpio To Wake Esp8266 Up From Light-Sleep Mode

    11. AT+WAKEUPGPIO – set a GPIO to wake ESP8266 up from light-sleep mode This command sets a GPIO to wake the ESP8266 up from light-sleep mode. Please note that the <trigger_GPIO> and the <awake_GPIO> in the command cannot use the same GPIO.

  • Page 22: At+Rfpower - Set Maximum Value Of Rf Tx Power

    13. AT+RFVDD – set RF TX Power according to VDD33 This command sets ESP8266 RF TX power according to VDD33. To get the power voltage of ESP8266 VDD3P3, TOUT pin has to be suspended. TOUT pin has to be suspended in order to measure VDD33.
  • Page 23 ESP8266 Espressif Systems AT Instruction Set " " " "AT+RFVDD" will automatically set RF TX power according to VDD33. Note TOUT pin has to be suspended. Espressif Systems 20 73 Friday, July 15, 2016...

  • Page 24: Wi-Fi At Commands

    Set current configuration of ESP8266 soft-AP AT+CWSAP_CUR Settings not updated in flash. Set configuration of ESP8266 soft-AP AT+CWSAP_DEF Save changes to flash. AT+CWLIF Get station IP which is connected to ESP8266 soft-AP AT+CWDHCP Enable/Disable DHCP, [@deprecated] AT+CWDHCP_CUR Enable/Disable DHCP, changes not save to flash AT+CWDHCP_DEF...
  • Page 25 AT+CIPAP_DEF Save changes to flash. AT+CWSTARTSMART Start SmartConfig AT+CWSTOPSMART Stop SmartConfig AT+CWSTARTDISCOVER Start the mode that ESP8266 can be found by WeChat AT+CWSTOPDISCOVER Stop the mode that ESP8266 can be found by WeChat AT+WPS Set WPS function AT+MDNS Set MDNS function...

  • Page 26: Commands

    ESP8266 Espressif Systems AT Instruction Set " " " 4.1. Commands AT+CWMODE – WiFi mode The function of this AT command is to get the value scope of Wi-Fi mode, including station mode, softAP mode, and station+softAP mode, enquiry about the information of Wi-Fi mode, or set the Wi-Fi mode.

  • Page 27: At+Cwmode_Cur - Current Wifi Mode

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CWMODE_CUR – current WiFi mode There are three Wi-Fi working modes: Station mode, softAP mode, and the co-existence of Station mode and softAP mode. This command is used to query the current Wi-Fi mode, or to set a desired Wi-Fi mode.

  • Page 28: At+Cwmode_Def - Default Wifi Mode

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CWMODE_DEF – default WiFi mode AT+CWMODE_DEF - WiFi mode (sta/AP/sta+AP), save to flash Example AT+CWMODE_DEF=3 Command AT+CWMODE_DEF=? +CWMODE_DEF:( value scope of <mode>) Response <mode> 1 : station mode Parameters 2 : softAP mode...

  • Page 29: At+Cwjap - Connect To Ap

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CWJAP – Connect to AP AT+CWJAP – Connect to AP [@deprecated]. Please use AT+CWJAP_CUR or AT+CWJAP_DEF instead. • AT+CWJAP ="abc", "0123456789" • If SSID is "ab\, c" and password is "0123456789"\"...

  • Page 30: At+Cwjap_Cur - Connect To Ap, For Current

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CWJAP_CUR – Connect to AP, for current AT+CWJAP_CUR – Connect to AP, won‘t save to flash • AT+CWJAP_CUR ="abc", "0123456789" • If SSID is "ab\, c" and password is "0123456789"\" Example AT+CWJAP_CUR="ab\\\, c", "0123456789\"\\"...

  • Page 31: At+Cwjap_Def - Connect To Ap, Save As Default

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CWJAP_DEF – Connect to AP, save as default AT+CWJAP_DEF – Connect to AP and save AP info to flash • AT+CWJAP_DEF="abc", "0123456789" If SSID is "ab\, c" and password is "0123456789"\"...

  • Page 32: At+Cwlapopt - Set Configuration For Command At+Cwlap

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CWLAPOPT – Set configuration for command AT+CWLAP This command is to set the configuration for command AT+CWLAP, whether the result of AT+CWLAP will be ordered according to <rssi>, and which parameters will be shown in the result of AT+CWLAP.

  • Page 33: At+Cwlap - List Available Aps

    " " " AT+CWLAP – List available APs AT+CWLAP - Lists available APs • AT+CWLAP List of all available AP's detected by ESP8266 • AT+CWLAP="WiFi", "ca:d7:19:d8:a6:44", 6 Example Find AP with specific SSID and MAC at specific channel. • AT+CWLAP="WiFi"...

  • Page 34: At+Cwqap - Disconnect From Ap

    2 : WPA_PSK 3 : WPA2_PSK Parameters 4 : WPA_WPA2_PSK <max conn> maximum count of stations that are allowed to connect to ESP8266 soft-AP range: [1, 4] <ssid hidden> Broadcast SSID by default 0 : broadcast SSID of ESP8266 soft-AP...

  • Page 35: At+Cwsap_Cur - Current Config Of Softap Mode

    3 : WPA2_PSK Parameters 4 : WPA_WPA2_PSK [<max conn>], optional, default is 4 maximum count of stations that are allowed to connect to ESP8266 soft-AP range: [1, 4] [<ssid hidden>], optional, b roadcast SSID by default 0 : broadcast SSID of ESP8266 soft-AP 1 : do not broadcast SSID of ESP8266 soft-AP This command is only available when softAP is active.

  • Page 36: At+Cwsap_Def - Default Config Of Softap Mode

    3 : WPA2_PSK Parameters 4 : WPA_WPA2_PSK [<max conn>], optional, default is 4 maximum count of stations that are allowed to connect to ESP8266 soft-AP range: [1, 4] [<ssid hidden>], optional, b roadcast SSID by default 0 : broadcast SSID of ESP8266 soft-AP 1 : do not broadcast SSID of ESP8266 soft-AP This command is only available when softAP is active.

  • Page 37: At+Cwlif - Ip Of Stations

    " " " 13. AT+CWLIF – IP of stations This command is used to get the IP of stations that are connected to ESP8266 softAP. AT+ CWLIF– IP of stations which are connected to ESP8266 softAP <IP addr>, <mac> Response <IP addr>...

  • Page 38: At+Cwdhcp - Enable/Disable Dhcp

    : 0 - station DHCP disabled 1 - station DHCP enabled Command AT+CWDHCP=<mode>, <en> Response <mode> 0 : set ESP8266 soft-AP 1 : set ESP8266 station Parameters 2 : set both softAP and station <en> 0 : Disable DHCP 1 : Enable DHCP •...

  • Page 39: At+Cwdhcp_Cur - Enable/Disable Dhcp

    : 0 - station DHCP disabled 1 - station DHCP enabled Command AT+CWDHCP_CUR=<mode>, <en> Response <mode> 0 : set ESP8266 soft-AP 1 : set ESP8266 station Parameters 2 : set both softAP and station <en> 0 : Disable DHCP 1 : Enable DHCP •...

  • Page 40: At+Cwdhcp_Def - Enable/Disable Dhcp And Save To Flash

    : 0 - station DHCP disabled 1 - station DHCP enabled Command AT+CWDHCP_DEF=<mode>, <en> Response <mode> 0 : set ESP8266 soft-AP 1 : set ESP8266 station Parameters 2 : set both softAP and station <en> 0 : Disable DHCP 1 : Enable DHCP •...

  • Page 41: At+Cwdhcps_Cur - Set The Ip Address Allocated By Esp8266 Soft-Ap Dhcp, Does Not Save To Flash

    This AT command is enabled when ESP8266 runs as soft-AP, and when DHCP server is running normally. The IP address should be on the same network segment with the IP address of ESP8266 soft-AP. Configuration changes will not be stored in flash.

  • Page 42: At+Cwdhcps_Def - Set The Ip Address Allocated By Esp8266 Soft-Ap Dhcp, Save To Flash

    This AT command is enabled when ESP8266 runs as soft-AP, and when DHCP server is running normally. The IP address should be on the same network segment with the IP address of ESP8266 soft-AP. This configuration will be stored in flash user parameter area.

  • Page 43: At+Cipstamac - Set Mac Address Of Station

    MAC addresses of ESP8266 soft-AP and station are different, please do NOT set them to be the same. Note that the bit 0 of the first byte of ESP8266 MAC address cannot be 1, for example, MAC address can be "18:fe:35:98:d3:7b", but cannot be "15:fe:35:98:d3:7b".

  • Page 44: At+Cipstamac_Cur - Set Mac Address Of Station

    MAC addresses of ESP8266 soft-AP and station are different, please do NOT set them to be the same. Note that the bit 0 of the first byte of ESP8266 MAC address cannot be 1, for example, MAC address can be "18:fe:35:98:d3:7b", but cannot be "15:fe:35:98:d3:7b".

  • Page 45: At+Cipapmac - Set Mac Address Of Softap

    MAC addresses of ESP8266 soft-AP and station are different, please do NOT set them to be the same. Note that the bit 0 of the first byte of ESP8266 MAC address cannot be 1, for example, MAC address can be "1a:fe:36:97:d5:7b", but cannot be "15:fe:36:97:d5:7b".

  • Page 46: At+Cipapmac_Def - Set Mac Address Of Softap And Save As Default

    MAC addresses of ESP8266 soft-AP and station are different, please do NOT set them to be the same. Note that the bit 0 of the first byte of ESP8266 MAC address cannot be 1, for example, MAC address can be "1a:fe:36:97:d5:7b", but cannot be "15:fe:36:97:d5:7b".

  • Page 47: At+Cipsta - Set Ip Address Of Station

    " 26. AT+CIPSTA – Set IP address of station Only after ESP8266 station is connected to an AP, station IP can be obtained and inquired. Configuration changes will be stored in flash user parameter area. AT+ CIPSTA – Set IP address of ESP8266 station [@deprecated].

  • Page 48: At+Cipsta_Cur - Set Ip Address Of Station

    " 27. AT+CIPSTA_CUR – Set IP address of station Only after ESP8266 station is connected to an AP, station IP can be obtained and inquired. This configuration will NOT be stored in flash. AT+CIPSTA_CUR – Set IP address of ESP8266 station, do not save to flash Example AT+CIPSTA_CUR="192.168.6.100", "192.168.6.1", "255.255.255.0"...

  • Page 49: At+Cipsta_Def - Set Ip Address Of Station And Save As Default

    ESP8266 Espressif Systems AT Instruction Set " " " 28. AT+CIPSTA_DEF – Set IP address of station and save as default AT+CIPSTA_DEF – Set IP address of ESP8266 station, save to flash Example AT+CIPSTA_DEF="192.168.6.100", "192.168.6.1", "255.255.255.0" Command AT+CIPSTA_DEF? +CIPSTA:<IP> Response Parameters <IP>...

  • Page 50: At+ Cipap - Set Ip Address Of Softap

    " " 29. AT+ CIPAP – Set IP address of softAP ESP8266 only supports class C IP addresses. This configuration will be stored in flash user parameter area. AT+ CIPAP – Set IP address of ESP8266 softAP [@deprecated]. Please use AT+CIPAP_CUR or AT+CIPAP_DEF instead.

  • Page 51: At+Cipap_Cur - Set Ip Address Of Softap

    " " 30. AT+CIPAP_CUR – Set IP address of softAP ESP8266 only support class C IP address. This configuration will NOT store in flash. AT+CIPAP_CUR – Set IP address of ESP8266 softAP, won’t save to flash Example AT+CIPAP_CUR="192.168.5.1", "192.168.5.1", "255.255.255.0"...

  • Page 52: At+Cipap_Def - Set Ip Address Of Softap, Save As Default

    " " " 31. AT+CIPAP_DEF – Set IP address of softAP, save as default ESP8266 only supports class C IP addresses. AT+ CIPAP_DEF – Set IP address of ESP8266 softAP, save to flash Example AT+CIPAP_DEF="192.168.5.1", "192.168.5.1", "255.255.255.0" Command AT+CIPAP_DEF? +CIPAP_DEF:<IP>...

  • Page 53: At+Cwstartsmart - Start Smartconfig

    3 : ESP-Touch + AirKiss Message "Smart get WiFi info" means Smart Config acquired AP • information successfully, then ESP8266 will try to connect to target AP. "Smartconfig connected WiFi" is printed if connection is successful. Notes • ESP8266 cannot do anything during SmartConfig. Please wait for the message "Smartconfig connected...

  • Page 54: At+Cwstartdiscover - Start The Mode That Esp8266 Can Be Found By Wechat

    34. AT+CWSTARTDISCOVER – Start the mode that ESP8266 can be found by WeChat The parameter of this command needs to be obtained from Espressif Cloud. After connecting to an AP and obtaining an IP address, ESP8266 can be found by WeChat which is on the same LAN. WeChat : http://iot.weixin.qq.com AT+CWSTARTDISCOVER –...

  • Page 55: At+Wps - Set Wps Function

    AT Instruction Set " " " 36. AT+WPS – Set WPS function Noe that WPS function can only be used when ESP8266 station is enabled. WPS function does not support WEP encryption. AT+WPS – Set WPS function AT+CWMODE=1 Example AT+WPS=1 Command AT+WPS=<enable>...

  • Page 56: Tcp/Ip Related At Commands

    Configure as server AT+CIPMODE Set transmission mode AT+SAVETRANSLINK Save transparent transmission link to flash AT+CIPSTO Set timeout when ESP8266 runs as TCP server AT+CIUPDATE Upgrade firmware through network AT+PING Function PING AT+CIPDINFO Show remote IP and remote port with "+IPD"...

  • Page 57: Tcp/Ip

    0 : ESP8266 runs as client 1 : ESP8266 runs as server AT+CIPDOMAIN – DNS function ESP8266 needs to connect to a router to access to the internet first, then it is able to call the DNS function. AT+CIPDOMAIN – DNS function...

  • Page 58: At+Cipstart - Establish Tcp Connection, Udp Transmission Or Ssl Connection

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPSTART – Establish TCP connection, UDP transmission or SSL connection Refer to documentation "4B-ESP8266__AT Command Examples" for more on how to use this command. AT+CIPSTART – Function 1: Establish TCP connection AT+CIPSTART="TCP", "iot.espressif.cn", 8000...
  • Page 59 IP <remote port> string, remote port [<UDP local port>] optional, UDP port of ESP8266 Parameters [<UDP mode>] optional. In UDP transparent transmission, it has to be 0. 0 : destination peer entity of UDP will not change, default option.

  • Page 60: At+Cipsslsize - Set The Size Of Ssl Buffer

    AT Instruction Set " " " 1. ESP8266 can only set one SSL connection at most. 2. SSL connection does not support UART-WiFi passthrough mode (transparent transmission). Note 3. SSL connection needs a lot of memory, otherwise, it may cause system reboot.

  • Page 61: At+Cipsend - Send Data

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPSEND – Send data Please refer to documentation "4B-ESP8266__AT Command Examples" for more examples. Espressif Systems 58 73 Friday, July 15, 2016...
  • Page 62 ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPSEND – Send data (+CIPMUX=0) Single connection AT+CIPSEND=<length> (+CIPMUX=1) Multiple connection AT+CIPSEND=<link ID>, <length> UDP Transmission AT+CIPSEND=[<link ID>, ]<length>[, <remote IP>, <remote port>] Wrap return ">" after set command. Begins receiving serial data, when data length is met, starts transmission of data.

  • Page 63: At+Cipsendex - Send Data

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPSENDEX – Send data AT+CIPSENDEX – Send data (+CIPMUX=0) Single connection AT+CIPSENDEX=<length> (+CIPMUX=1) Multiple connection AT+CIPSENDEX=<link ID>, <length> UDP Transmission AT+CIPSENDEX=[<link ID>, ]<length>[, <remote IP>, <remote port>] Wrap return ">" after set command. Begins receiving serial data, when data length or "\0"...

  • Page 64: At+Cipsendbuf - Write Data Into Tcp-Send-Buffer

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPSENDBUF – Write data into TCP-send-buffer This command only writes data into TCP-send-buffer, so it can be called continually, and the user need not wait for "SEND OK"; if a TCP segment is sent successfully, it will return <segment ID>, SEND OK.

  • Page 65: At+Cipbufstatus - Check Status Of Tcp-Send-Buffer

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPBUFSTATUS – Check status of TCP-send-buffer Please do not use this command on SSL connections. AT+CIPBUFSTATUS – Check status of TCP-send-buffer Single connection: AT+CIPBUFSTATUS returns 20, 15, 10, 200, 7 : means the latest segment ID is 19, next time...

  • Page 66: At+Cipbufreset - Reset Segment Id Count

    ESP8266 Espressif Systems AT Instruction Set " " " AT+CIPCHECKSEQ – Check if a specific segment was sent successfully AT+CIPCHECKSEQ – Check if a specific segment was sent successfully (+CIPMUX=0) Single connection AT+CIPCHECKSEQ=<segment ID> (+CIPMUX=1) Multiple connection AT+CIPCHECKSEQ=<link ID>, <segment ID>...

  • Page 67: At+Cipclose - Close Tcp, Udp Or Ssl Connection

    + CIFSR:<IP address> Response <IP address> Parameters IP address of ESP8266 softAP IP address of ESP8266 station Only after ESP8266 station is connected to an AP, station IP can be obtained Note and inquired. Espressif Systems 64 73 Friday, July 15, 2016...

  • Page 68: At+Cipmux - Enable Multiple Connections

    ESP8266 Espressif Systems AT Instruction Set " " " 13. AT+CIPMUX – Enable multiple connections AT+ CIPMUX – Enable or disable multiple connections Example AT+CIPMUX=1 Command AT+CIPMUX? +CIPMUX:<mode> Response <mode> Parameters 0 : single connection 1 : multiple connection Command AT+CIPMUX=<mode>...

  • Page 69: At+Cipserver - Configure As Tcp Server

    ESP8266 Espressif Systems AT Instruction Set " " " 14. AT+CIPSERVER – Configure as TCP server Server monitor will automatically be created when Server is created. When a client is connected to the server, it will take up one connection and be assigned an ID.

  • Page 70: At+Cipmode - Set Transfer Mode

    During UART-WiFi passthrough transmission, if it is TCP connection and the TCP connection breaks, ESP8266 will keep trying to reconnect until "+++" is input to quit from transmission. After sending the "+++" token, please wait for at least 1 second before sending the next AT command.

  • Page 71: At+Savetranslink - Save Transparent Transmission Link To Flash

    This command will save the UART-WiFi passthrough mode and its link into • Flash user parameter area, ESP8266 will enter UART-WiFi passthrough mode Notes on any subsequent power cycles. As long as the IP (or domain name), port conform to the specification, they •...

  • Page 72: At+Cipsto - Set Tcp Server Timeout

    Response Parameters <time> TCP server timeout, range 0~7200 seconds ESP8266 configured as TCP server will disconnect to TCP client that did not Notes communicate with it until timeout. If AT+CIPSTO=0, the connection will never time out. It is not recommended.

  • Page 73: At+Ciupdate - Update Through Network

    ESP8266 Espressif Systems AT Instruction Set " " " 19. AT+CIUPDATE – Update through network Firmware upgrade depends on network condition. It will return ERROR if upgrade failed due to unfavorable network conditions. Please wait for some time before retrying.

  • Page 74: Ipd - Receive Network Data

    ESP8266 Espressif Systems AT Instruction Set " " " 21. +IPD – Receive network data +IPD – Receive network data (+CIPMUX=0) Single connection +IPD, <len>[, <remote IP>, <remote port>]:<data> (+CIPMUX=1) Multiple connection +IPD, <ID>, <len>[, <remote IP>, <remote port>]:<data> <remote IP>...

  • Page 75: Appendix

    ESP8266 Espressif Systems AT Instruction Set " " " Appendix ESP8266 AT commands below will save configuration parameters into flash: AT Command Example Save into flash user parameter area AT+UART_DEF AT+UART_DEF=115200, 8, 1, 0, 3 AT+CWDHCP_DEF AT+CWDHCP_DEF=1, 1 AT+CIPSTAMAC_DEF AT+CIPSTAMAC_DEF="18:fe:35:98:d3:7b"...
  • Page 76 ESP8266 Espressif Systems AT Instruction Set " " " Q&A If you have any questions about AT Commands, please contact us (feedback@espressif.com) with information as follows: • Version info of AT : Using "AT+GMR" to get the version info. Hardware Module info: example Ai-thinker ESP-01 •...

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