ESP8266 AT Commands Set | Circuits4you.com
This tutorial provides AT commands based on ESP8266_NONOS_SDK and explain how to use them. AT command set is divided into: Basic AT commands, Wi-Fi AT commands, and TCP/IP AT commands.
ESP8266 is a powerful controller with 4Mbytes of Flash and 84Kbytes of RAM. Then why you should use it as just Serial to WiFi module. I recommend use ESP with direct flashing i.e. without using AT commands.
You can Download Complete AT command set for ESP8266 NodeMCU here.
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AT Commands Firmware
AT commands will not work if ESP8266 not flashed with AT Firmware.
Downloading AT Firmware into the Flash. Please refer to ESP8266_NONOS_SDK/bin/at/readme.txt for instructions on how to download AT firmware into flash. Please use Espressif’s official Flash Download Tools to download the firmware. Make sure you select the corresponding flash size.
Espressif’s official Flash Download Tools: Espressif Download Tool
Basic AT commands of NodeMCU ESP8266
Commands
Description
AT
Tests AT startup.
AT+RST
Restarts the module.
AT+GMR
Checks version information.
AT+GSLP
Enters Deep-sleep mode.
ATE
Configures echoing of AT commands.
AT+RESTORE
Restores the factory default settings of the module.
AT+UART
UART configuration. [deprecated]
AT+UART_CUR
The current UART configuration.
AT+UART_DEF
The default UART configuration, saved in flash.
AT+SLEEP
Configures the sleep modes.
AT+WAKEUPGPIO
Configures a GPIO to wake ESP8266 up from Light-sleep mode.
AT+RFPOWER
Sets the maximum value of the RF TX Power.
AT+RFVDD
Sets the RF TX Power according to VDD33.
AT+RFAUTOTRACE
Sets RF frequency offset trace.
AT+SYSRAM
Checks the available RAM size.
AT+SYSADC
Checks the ADC value.
AT+SYSIOSETCFG
Sets configuration of IO pins.
AT+SYSIOGETCFG
Gets configuration of IO pins.
AT+SYSGPIODIR
Configures the direction of GPIO.
AT+SYSGPIOWRITE
Configures the GPIO output level
AT+SYSGPIOREAD
Checks the GPIO input level.
Wi-Fi AT commands of ESP8266
Commands
Description
AT+CWMODE
Sets the Wi-Fi mode (Station/AP/Station+AP). [@deprecated]
AT+CWMODE_CUR
Sets the Wi-Fi mode (Station/AP/Station+AP); configuration not saved in the flash.
AT+CWMODE_DEF
Sets the default Wi-Fi mode (Station/AP/Station+AP); configuration saved in the flash.
AT+CWJAP
Connect to an AP. [@deprecated]
AT+CWJAP_CUR
Connects to an AP; configuration not saved in the flash.
AT+CWJAP_DEF
Connects to an AP; configuration saved in the flash.
AT+CWLAPOPT
Sets the configuration of command AT+CWLAP.
AT+CWLAP
Lists available APs.
AT+CWQAP
Disconnects from an AP.
AT+CWSAP
Sets the configuration of the ESP8266 SoftAP. [@deprecated]
AT+CWSAP_CUR
Sets the current configuration of the ESP8266 SoftAP; configuration not saved in the flash.
AT+CWSAP_DEF
Sets the configuration of the ESP8266 SoftAP; configuration saved in the flash.
AT+CWLIF
Gets the Station IP to which the ESP8266 SoftAP is connected.
AT+CWDHCP
Enables/Disables DHCP. [@deprecated]
AT+CWDHCP_CUR
Enables/Disables DHCP; configuration not saved in the flash.
AT+CWDHCP_DEF
Enable/Disable DHCP; configuration saved in the flash.
AT+CWDHCPS_CUR
Sets the IP range of the DHCP server; configuration not saved in the flash.
AT+CWDHCPS_DEF
Sets the IP range of the DHCP server; configuration saved in the flash.
AT+CWAUTOCONN
Connects to an AP automatically on power-up.
AT+CIPSTAMAC
Sets the MAC address of the ESP8266 Station. [@deprecated]
AT+CIPSTAMAC_CUR
Sets the MAC address of the ESP8266 Station; configuration not saved in the flash.
AT+CIPSTAMAC_DEF
Sets the MAC address of ESP8266 station; configuration saved in the flash.
AT+CIPAPMAC
Sets the MAC address of the ESP8266 SoftAP. [@deprecated]
AT+CIPAPMAC_CUR
Sets the MAC address of the ESP8266 SoftAP; configuration not saved in the flash.
AT+CIPAPMAC_DEF
Sets the MAC address of the ESP8266 SoftAP; configuration saved in the flash.
AT+CIPSTA
Sets the IP address of the ESP8266 Station. [@deprecated]
AT+CIPSTA_CUR
Sets the IP address of the ESP8266 Station; configuration not saved in the flash.
AT+CIPSTA_DEF
Sets the IP address of the ESP8266 Station; configuration saved in the flash.
AT+CIPAP
Sets the IP address of ESP8266 SoftAP. [@deprecated]
AT+CIPAP_CUR
Sets the IP address of ESP8266 SoftAP; configuration not saved in the flash.
AT+CIPAP_DEF
Sets the IP address of ESP8266 SoftAP; configuration saved in the flash.
AT+CWSTARTSMART
Starts SmartConfig.
AT+CWSTOPSMART
Stops SmartConfig.
AT+CWSTARTDISCOVER
Enables the mode that ESP8266 can be found by WeChat.
AT+CWSTOPDISCOVER
Disables the mode that ESP8266 can be found by WeChat.
AT+WPS
Sets the WPS function.
AT+MDNS
Sets the MDNS function.
AT+CWHOSTNAME
Sets the host name of the ESP8266 Station.
TCP/IP AT commands for ESP8266
Command
Description
AT+CIPSTATUS
Gets the connection status
AT+CIPDOMAIN
DNS function
AT+CIPSTART
Establishes TCP connection, UDP transmission or SSL connection
AT+CIPSSLSIZE
Sets the size of SSL buffer
AT+CIPSEND
Sends data
AT+CIPSENDEX
Sends data when length of data is <length>, or when \0 appears in the data
AT+CIPSENDBUF
Writes data into TCP-send-buffer
AT+CIPBUFRESET
Resets the segment ID count
AT+CIPBUFSTATUS
Checks the status of TCP-send-buffer
AT+CIPCHECKSEQ
Checks if a specific segment is sent or not
AT+CIPCLOSE
Closes TCP/UDP/SSL connection
AT+CIFSR
Gets the local IP address
AT+CIPMUX
Configures the multiple connections mode
AT+CIPSERVER
Deletes/Creates a TCP server
AT+CIPMODE
Configures the transmission mode
AT+SAVETRANSLINK
Saves the transparent transmission link in the flash
AT+CIPSTO
Sets timeout when ESP8266 runs as TCP server
AT+PING
Ping packets
AT+CIUPDATE
Upgrades the software through network
AT+CIPDINFO
Shows remote IP and remote port with +IPD
AT+CIPSNTPCFG
Configures the time domain and SNTP server.
AT+CIPSNTPTIME
Queries the SNTP time.
AT+CIPDNS_CUR
Sets user-defined DNS servers; configuration not saved in the flash
AT+CIPDNS_DEF
Sets user-defined DNS servers; configuration saved in the flash
Direct flashing/programming of ESP is recommended to get maximum benefits of powerful low cose WiFi Module. It uses same Arduino IDE and its C commands.
