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v2.3.0.0_esp8266 ESP8266-AT Release v2.3.0.0

The documentation for ESP-AT v2.3.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v2.3.0.0_esp8266/

This release is a minor update to ESP-AT v2.2.2.0.

The firmware:

ESP-WROOM-02-AT-V2.3.0.0.zip

Breaking Changes

Updated ESP8266_RTOS_SDK to commit c965e03d, upgrading the bundled mbedtls library from v2.16.5 to commit 1d34215a (a few commits after v3.6.3). Important: If you want to use this version firmware, please ensure your server is compatible with mbedtls commit 1d34215a before proceeding. If it works fine, you can upgrade your products by AT+CIUPDATE=0,"v2.3.0.0".

Feature

Added the AT+CIPSSLCCIPHER command to configure the SSL cipher‑suite list

Bugfix

Fixed a potential SSL reconnection failure in passthrough mode when the SNI/CN/PSK/ALPN parameters were set before entering passthrough mode

v4.1.1.0 v4.1.1.0 Release Notes

v4.1.1.0 is released for ESP32-C2, ESP32-C3, ESP32-C6, ESP32, and ESP32-S2. The changes since the previous version are as follows.

ESP32C2-AT

Documentation for Release v4.1.1.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32c2/index.html. ESP32C2-AT v4.1.1.0 is a minor update for ESP32C2-AT v4.1.0.0.

The firmware:

This is the list of changes since release v4.1.0.0:

Known Issues

AT+FS may fail after repeated read/write operations

Bugfix

Fixed a potential system hang when using AT+MQTTSUB with QoS 1, triggered by a fast SUBACK response from the broker
Fixed a potential system hang when executing AT+MQTTPUB with QoS 1 or 2, AT+MQTTSUB with QoS 1, or AT+MQTTUNSUB, if the ESP does not receive the corresponding PUBACK, SUBACK, or UNSUBACK within 30 seconds,
while MQTT PING messages are still being exchanged normally.

ESP32C3-AT

Documentation for Release v4.1.1.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32c3/index.html. ESP32C3-AT v4.1.1.0 is a minor update for ESP32C3-AT v4.1.0.0.

The firmwares:

ESP32-C3-MINI-1-AT-V4.1.1.0.zip

This is the list of changes since release v4.1.0.0:

Known Issues

AT+FS may fail after repeated read/write operations

Bugfix

Fixed a potential system hang when using AT+MQTTSUB with QoS 1, triggered by a fast SUBACK response from the broker
Fixed a potential system hang when executing AT+MQTTPUB with QoS 1 or 2, AT+MQTTSUB with QoS 1, or AT+MQTTUNSUB, if the ESP does not receive the corresponding PUBACK, SUBACK, or UNSUBACK within 30 seconds,
while MQTT PING messages are still being exchanged normally.

ESP32C6-AT

Documentation for Release v4.1.1.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32c6/index.html. ESP32C6-AT v4.1.1.0 is a minor update for ESP32C6-AT v4.1.0.0.

The firmwares:

ESP32-C6-4MB-AT-V4.1.1.0.zip

This is the list of changes since release v4.1.0.0:

Known Issues

AT+FS may fail after repeated read/write operations

Bugfix

Fixed a potential system hang when using AT+MQTTSUB with QoS 1, triggered by a fast SUBACK response from the broker
Fixed a potential system hang when executing AT+MQTTPUB with QoS 1 or 2, AT+MQTTSUB with QoS 1, or AT+MQTTUNSUB, if the ESP does not receive the corresponding PUBACK, SUBACK, or UNSUBACK within 30 seconds,
while MQTT PING messages are still being exchanged normally.

ESP32-AT

Documentation for Release v4.1.1.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32/index.html. ESP32-AT v4.1.1.0 is a minor update for ESP32-AT v4.1.0.0.

The firmwares:

This is the list of changes since release v4.1.0.0:

Known Issues

AT+FS may fail after repeated read/write operations
After sending the AT+BLUFI=1 command, if the device was previously in SoftAP or Station+SoftAP mode, the SoftAP interface may briefly restart.

Bugfix

Fixed a known issue where AT+BLUFI after disabling and re-enabling BLUFI without power cycling, BLE advertising may fail to start.
Fixed a potential system hang when using AT+MQTTSUB with QoS 1, triggered by a fast SUBACK response from the broker
Fixed a potential system hang when executing AT+MQTTPUB with QoS 1 or 2, AT+MQTTSUB with QoS 1, or AT+MQTTUNSUB, if the ESP does not receive the corresponding PUBACK, SUBACK, or UNSUBACK within 30 seconds,
while MQTT PING messages are still being exchanged normally.

ESP32S2-AT

Documentation for Release v4.1.1.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32s2/index.html. ESP32S2-AT v4.1.1.0 is a major update for ESP32S2-AT v3.4.0.0.

The firmwares:

ESP32-S2-MINI-AT-V4.1.1.0.zip

This is the list of changes since release v3.4.0.0:

Known Issues

AT+FS may fail after repeated read/write operations

Changelog Basic

Added the AT+SYSRAM setup command to detail memory capacity
Added the AT+SYSROLLBACK query command to obtain the address and version of the current and rollback firmware
Added the AT+RFCAL command to support RF full calibration
Added deduplication support for the AT+SYSMFG command
Added sleep support in the BLE‑only firmware
Added support to disable sleep when Wi‑Fi and BLE coexist
Fixed an issue where AT+SYSMSGFILTER did not work when the data contained \r\n

Wi-Fi

Added the AT+CWBANDWIDTH command to set Wi‑Fi bandwidth
Added the AT+CWCONFIG command to set the global inactive time and listen interval
Expand authmode range for AT+CWLAPOPT, AT+WPS, AT+CWSTARTSMART and AT+BLUFI
Fixed a station‑connection failure when using AT+CWJAP after connecting to an Enterprise AP with AT+CWJEAP
Fixed a crash when setting hostname length to 32 bytes via AT+CWHOSTNAME
Fixed two WPA2‑Enterprise connection issues
Fixed a potential Wi‑Fi issue where the device disconnected immediately after powering on and connecting to the AP
Fixed an issue where AT+CWLAP did not return valid APs when BLUFI was enabled
Fixed incorrect Wi‑Fi reconnection behavior after sending the AT+CWQAP and AT+CWRECONNCFG commands
Fixed a Wi‑Fi disconnection issue when sending the AT+CWRECONNCFG command twice

TCP/IP

Added a netif parameter to the AT+CIPSERVER command
Added the AT+CIPSSLCCIPHER command to configure the SSL cipher‑suite list
Added a timeout parameter to the AT+CIPSTART and AT+CIPDOMAIN commands
Added support for a backup DNS server in AT+CIPDNS
Fixed AT+CWDHCP returning an incorrect DHCP state after the DHCP server was disabled
Fixed an issue where AT+CIPRECVLEN? always returned a fixed set of five connections
Fixed several issues where AT+CIPSTATUS returned incorrect statuses
Fixed an infinite‑loop issue when the SSL server encountered a PKI read error
Fixed some potential reconnection issues in passthrough mode
Fixed an issue where TLS resources were not freed if TLS negotiation failed
Fixed an issue where AT+CIPCLOSE could not close a connection after reaching the maximum number of open sockets
Fixed an issue where the UDP mode in AT+CIPSTART did not work in passive‑read mode
Fixed an asynchronous issue with AT+CIPRECVLEN
Fixed an issue where AT+CIPSTO did not take effect when data transmission failed

mDNS

Added mDNS query support to AT+MDNS
Added the instance, proto, and txt parameters to the AT+MDNS command

HTTP

Added HTTP status‑code output for HTTP commands
Added the AT+HTTPCFG command to configure certificates for HTTP
Added HTTP‑header deduplication to the AT+HTTPCHEAD command

MQTT

Change MQTT message retransmission interval from 1 second to 5 seconds to improve connection stability
Fixed an issue where an MQTT QoS 2 PUBREL packet might not be retransmitted
Fixed a potential system hang when executing AT+MQTTPUB with QoS 1 or 2, AT+MQTTSUB with QoS 1, or AT+MQTTUNSUB, if the ESP does not receive the corresponding PUBACK, SUBACK, or UNSUBACK within 30 seconds,
while MQTT PING messages are still being exchanged normally.

FatFS

Added FatFS support on 2 MB flash
Added a data‑length check when writing to FatFS
Fixed several FatFS mount and unmount issues
Fixed a mismatch between the generated fatfs.bin size and the required size
Fixed an issue where FatFS did not work if fatfs.bin was not pre‑burned before flashing
Fixed an issue where fwrite() returned OK but data was not written to the file system

OTA

Enabled app rollback support
Added compressed OTA v3 support and a sanity checker

WebServer

Fixed a compilation error when WebSocket and info logging we...

Read more v4.1.0.0 v4.1.0.0 Release Notes

v4.1.0.0 is released for ESP32-C2, ESP32-C3, ESP32-C6, and ESP32. The changes since the previous version are as follows.

ESP32C2-AT

Documentation for Release v4.1.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32c2/index.html. ESP32C2-AT v4.1.0.0 is a major update for ESP32C2-AT v3.3.0.0.

The firmware:

This is the list of changes since release v3.3.0.0:

Known Issues

AT+FS may fail after repeated read/write operations

Changelog Basic

Added the AT+SYSRAM setup command to detail memory capacity
Added the AT+SYSROLLBACK query command to obtain the address and version of the current and rollback firmware
Added the AT+RFCAL command to support RF full calibration
Added deduplication support for the AT+SYSMFG command
Added sleep support in the BLE‑only firmware
Added support to disable sleep when Wi‑Fi and BLE coexist
Fixed an issue where AT+SYSMSGFILTER did not work when the data contained \r\n

Wi-Fi

Added the AT+CWBANDWIDTH command to set Wi‑Fi bandwidth
Added the AT+CWCONFIG command to set the global inactive time and listen interval
Expand authmode range for AT+CWLAPOPT, AT+WPS, AT+CWSTARTSMART and AT+BLUFI
Fixed a station‑connection failure when using AT+CWJAP after connecting to an Enterprise AP with AT+CWJEAP
Fixed a crash when setting hostname length to 32 bytes via AT+CWHOSTNAME
Fixed two WPA2‑Enterprise connection issues
Fixed a potential Wi‑Fi issue where the device disconnected immediately after powering on and connecting to the AP
Fixed an issue where AT+CWLAP did not return valid APs when BLUFI was enabled
Fixed incorrect Wi‑Fi reconnection behavior after sending the AT+CWQAP and AT+CWRECONNCFG commands
Fixed a Wi‑Fi disconnection issue when sending the AT+CWRECONNCFG command twice
Fixed an issue where IPv6 information was output in passthrough mode

TCP/IP

Added a netif parameter to the AT+CIPSERVER command
Added the AT+CIPSSLCCIPHER command to configure the SSL cipher‑suite list
Added a timeout parameter to the AT+CIPSTART and AT+CIPDOMAIN commands
Added support for a backup DNS server in AT+CIPDNS in AT+CIPDNS
Fixed AT+CWDHCP returning an incorrect DHCP state after the DHCP server was disabled
Fixed an issue where AT+CIPRECVLEN? always returned a fixed set of five connections
Fixed several issues where AT+CIPSTATUS returned incorrect statuses
Fixed an infinite‑loop issue when the SSL server encountered a PKI read error
Fixed some potential reconnection issues in passthrough mode
Fixed an issue where TLS resources were not freed if TLS negotiation failed
Fixed an issue where AT+CIPCLOSE could not close a connection after reaching the maximum number of open sockets
Fixed an issue where the UDP mode in AT+CIPSTART did not work in passive‑read mode
Fixed an asynchronous issue with AT+CIPRECVLEN
Fixed an issue where AT+CIPSTO did not take effect when data transmission failed

mDNS

Added mDNS query support to AT+MDNS
Added the instance, proto, and txt parameters to the AT+MDNS command

HTTP

Enabled HTTP commands on the esp32c2‑2mb firmware
Added HTTP status‑code output for HTTP commands
Added the AT+HTTPCFG command to configure certificates for HTTP
Added HTTP‑header deduplication to the AT+HTTPCHEAD command

MQTT

Change MQTT message retransmission interval from 1 second to 5 seconds to improve connection stability
Fixed a potential issue where MQTT subscribe via AT+MQTTSUB failed but returned OK
Fixed an issue where an MQTT QoS 2 PUBREL packet might not be retransmitted

FatFS

Added FatFS support on 2 MB flash
Added a data‑length check when writing to FatFS
Fixed several FatFS mount and unmount issues
Fixed a mismatch between the generated fatfs.bin size and the required size
Fixed an issue where FatFS did not work if fatfs.bin was not pre‑burned before flashing
Fixed an issue where fwrite() returned OK but data was not written to the file system

OTA

Enabled app rollback support
Added compressed OTA v3 support and a sanity checker

WebServer

Fixed a compilation error when WebSocket and info logging were enabled
Fixed two slist issues where the pointer fail_item was used after free
Fixed a potential crash when printing if the SSID length was 32 bytes
Fixed an issue where AT‑Web netconfig failed when used with the WeChat applet

WebSocket

Added additional parameters to the AT+WSCFG command to configure certificates in WebSocket

Bluetooth

Fixed AT command response interleaving issues causing data corruption
Fixed AT command response issues where the \r character was missing
Added BLE light sleep support on esp32c2
Added BLE adv type information
Fixed missing +BLESCANDONE issue
Resolved data loss issue in BLE passthrough mode
Optimized BLE WRITE/INDICATE flow control mechanism
Fixed crash in BLE transparent transmission mode
Fixed AT+BTENCCLEAR not properly clearing BT pairing information
Fixed BLE_TT_MODE printed twice in BLE passthrough mode
Fixed missing +WRITE response
Fixed BLUFI memory leak
Fixed issue where MTU size greater than attribute length caused data transmission failure
Fixed that AT+RFPOWER query not returning BLE power when using nimble protocol
Fixed extra +BLEDISCONN message when sending AT+BLEDISCONN=0

Interface

Optimized the UART1 clock source
Fixed a potential crash when AT was not ready but received data
Fixed a potential UART voltage fluctuation during light sleep
Fixed some socket interface issues
Fixed an SDIO compilation warning
Fixed a heap‑corruption issue when using the SDIO interface

System

esp-idf version updated to ~v5.4.2
Added an unfilled factory binary
Added a checker to prevent duplicate keys in *.defaults
Added some return value checks for driver commands
Added pre_wakeup_callback and process_light_sleep hook events
Added a hook function for memory allocation failure
Added the esp_at_ready_before() API to perform tasks before ESP‑AT is ready
Added the at_exe_cmd() API to execute AT commands via ESP‑AT itself
Supported the new log system and improved log readability
Added support to configure the default system storage mode
Added support to print the firmware source
Added support to override default configurations
Optimized resources to increase available RAM
Reduced power consumption when a beacon is lost
Optimized the root CMake file
Decoupled Wi‑Fi and BLE functions from the base commands
Renamed esp_at_get_netconn_count() to esp_at_get_netconn_max_count()
Exposed esp_at_get_smartconfig_start_config() API
Reconfigured TWDT to disable the panic trigger when AT debug is enabled
Provided some weak symbols to allow external overriding (esp_at_nvs_set_xxx/esp_at_nvs_get_xxx/esp_at_log_write)
Fixed an issue where the factory binary was not generated in some cases
Fixed an issue where patches could not be applied on Windows
Fixed several MCU wake‑up issues

Optimization

TCP & SSL: TCP/SSL connections are now proactively closed immediately when their associated netif state changes (netif down, stop, or lost IP). In previous versions, the connections would remain open until a keep-alive timeout, send timeout, or max retry threshold was reached - often taking tens of seconds to close. This change significantly reduces latency in connection teardown and improves system responsiveness.
Upgraded supported python version and some package versions
Optimized patching process
Replaced the previous script with esptool.py merge_bin
Fixed a potential issue where the patch is applied multiple times
Fixed an issue where gatts_cfg was excessively modified by the at.py script

Examples

Added a fatfs_to_http_server example
Added a http_get_to_fatfs example
Added a WebSocket example document
Added an AT interface security example

Documentation

Improved documentation for AT commands, examples, and development
Added richer content for new features and changes
Added a chatbox on docs.espressif.com/projects/esp-at
Added a disclaimer for the esp-at project
Added some document format checks

ESP32C3-AT

Documentation for Release v4.1.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v4.1.0.0/esp32c3/index.html. ESP32C3-AT v4.1.0.0 is a major update for ESP32C3-AT v3.3.0.0.

The firmwares:

ESP32-C3-MINI-1-AT-V4.1.0.0.zip

This is the list of changes since release v3.3.0.0:

Known Issues

AT+FS may fail after repeated read/write operations

Changelog Basic

Added the AT+SYSRAM setup command to detail memory capacity
Added t...

Read more v2.2.2.0_esp8266 ESP8266 AT Release v2.2.2.0

The documentation for ESP-AT v2.2.2.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v2.2.0.0_esp8266/. This release is a minor update to ESP-AT v2.2.1.0.

ESP-WROOM-02-AT-V2.2.2.0.zip

Breaking Changes Since Release v2.2.1.0

ESP8266_RTOS_SDK version update: Upgraded to release v3.4 (ff16a35c).
Disclaimer update: Included an important disclaimer for ESP-AT.

1. Feature

Added the AT+USERWKMCUCFG and AT+USERMCUSLEEP commands to wake up MCU.
Added the AT+CIPSSLCCIPHER command to specify ssl cipher suite.
Added AT+CIPSTATE command to query connection state.
Added fallback DNS server. AT has two DNS servers ("208.67.222.222" and "8.8.8.8") by default.
Added the AT+MQTTLONGCLIENTID command to set MQTT client ID.
Added the AT+MQTTLONGUSERNAME command to set MQTT username.
Added the AT+MQTTLONGPASSWORD command to set MQTT password.
AT+WEBSERVER: Wi-Fi provisioning supports the special character in SSID and password.

2. Bugfix 2.1 Wi-Fi

Fixed an issue where AT+CWJAP occasionally returned an incorrect reason code.
Fixed an issue where AT+CWSTATE occasionally returned an incorrect state.
Fixed a potential crash when the lSSID length was exactly 32 bytes or the password length was 64 bytes.
Fixed an issue where AT+CWLAP occasionally returned an ERROR.
Fixed an auto-connection issue with WPA2 Enterprise AP. Users should always use AT+CWJEAP to connect to a WPA2 Enterprise AP.
Fixed an issue where the +CWJAP error code might be printed before the "WIFI DISCONNECT" message.

2.2 TCP/IP

Fixed an issue where the AT+CIPDNS query command returned an incorrect configuration.
Fixed an issue where AT+CIPSERVER=0,1 did not correctly close clients connected to the ESP TCP server.
Fixed an issue where setting AT+CIPSERVER=5 returned "Have 255 Connections" sometimes.
Fixed an issue where AT+CIPTCPOPT send timeout parameter failed to work sometimes.
Fixed an issue with active TCP data writes in passive mode.
Fixed an occasional crash in passthrough mode caused by a socket close.
Fixed +IPD report loss when the TCP connection was reopened while AT was acting as a server.
Fixed an occasional failure when AT+CIPSERVERMAXCONN=5 was set.
Fixed an issue where AT+CIPSTO did not reset the timer after sending data.
Fixed an ssl connection issue where the connection was dropped after receiving data when AT+CIPRECVMODE=1 was used.
Updated the "+IPD" command to report actual ssl available bytes whenever possible, except when TCP buffers data but SSL does not.
Fixed a potential illegal assignment issue with the AT+CIPTCPOPT command in multiple connections.
Fixed an issue where AT+CIPTCPOPT did not work when ESP-AT operated as a server.
Fixed an issue where AT+CIPSTART could not establish multiple UDP transmissions on the same port.
Fixed an occasional disconnection issue when the link state changed.
Corrected an invalid maximum number of tcp retransmission.
Fixed an issue where the maximum parameter length for AT+CIPSSLCCN and AT+CIPSSLCSNI could not be set to 64 bytes.

2.3 Application

Removed extra space in AT+HTTPCLIENT HEAD response.
Fixed an issue where AT+HTTPCPOST response returned the wrong command name when additional POST data was appended.

2.4 System

Fixed an issue of high power consumption after power-on when AT+CWMODE=0 was set.
Fixed a potential issue where uart data was blocked in the RX ring buffer.
Fixed several potential busy p... issues occurring occasionally.
Fixed a problem where GPIO15 did not function correctly in custom modules based on ESP8266.
Fixed an occasional system hang caused by a deadlock.
Fixed a crash occurring when invalid GPIO wake-up configurations were set.

3. Optimization

Removed potential NVS writes at startup when dirty data was detected during NVS read operations.
Enhanced handling of multiple connections by ensuring all available bytes from one link are read before processing the next.
Added parameters validation for the AT+CIPTCPOPT command.

v3.3.1.0 v3.2.1.0 v3.4.0.0 v3.4.0.0 Release Notes

v3.4.0.0 is released for ESP32 and ESP32-S2. The changes since the previous version are as follows.

ESP32-AT

Documentation for Release v3.4.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v3.4.0.0/esp32/index.html. ESP32-AT v3.4.0.0 is a major update for ESP32-AT v3.2.0.0.

The firmwares:

This is the list of changes since release v3.2.0.0:

Breaking Changes

esp-idf version updated to v5.0.6
RF power: Fixed the issue that the actual wifi transmit power didn't match the settings. The default configuration of wifi transmit power is 19.5 dBm, but the actual wifi transmit power may be slightly lower than the settings. This is because the wifi transmit power is limited by your country code according to phy_multiple_init_data.bin configuration. In the current version, esp-at disabled multiple phy init data bin to improve the wifi transmit power (rf power is no longer limited by your country code).

1. Feature 1.1 TCP/IP

Added the AT+CIPRECVTYPE command to set recv mode for each connection
AT+CIPRECVLEN query command can return the real data length now

1.2 Application Layer

AT+MQTTCONNCFG: Enlarged lwt msg length to 128 bytes
Added the AT+MQTTSNI command to set MQTT server name indication

2. Bugfix 2.1 Wi-Fi

AT+CWLAP: Fixed an issue where executing AT+CWLAP may return an ERROR when the AT+CWRECONNCFG command is sent immediately after the Wi-Fi disconnection

2.2 TCP/IP

AT+PING: Fixed an issue that cannot ping a linklocal ipv6 address
Fixed an ssl issue where "CLOSED" was output before reading all data in passive mode
Fixed a potential ssl crash caused when mbedtls dynamic buffer feature is used and an ssl renegotiation occurs
Fixed an issue where esp-tls is unable to parse ECC keys

2.3 System

Fixed the issue that AT could not work immediately after restart and prompt ready
Fixed an AT+SYSFLASH crash issue if a large amount of data is read
Fixed a potential GPIO voltage fluctuation issue during light-sleep

2.4 Bluetooth

Fixed BLE don't print ble connection params update fail issue
Fixed BLE memory leak issue

3. Optimization

Optimized sntp startup delay and receive timeout to speed up sntp time acquisition
Re-organized the gitlab ci
Re-organized the main directory of the esp-at repository
Added some debug options to allow different kinds of esp-at debug output

ESP32S2-AT

Documentation for Release v3.4.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v3.4.0.0/esp32s2/index.html. ESP32S2-AT v3.4.0.0 is a major update for ESP32S2-AT v2.1.0.0.

The firmware:

ESP32-S2-MINI-AT-V3.4.0.0.zip

This is the list of changes since release v2.1.0.0:

Breaking Changes

esp-idf version updated to v5.0.6

1. Feature 1.1 Basic

Added more Basic AT commands:

AT+CMD: List all AT commands and types supported in the current firmware.
AT+TRANSINTVL: Set the data transmission interval in the Passthrough Mode.
AT+SYSMSGFILTER: Enable or disable the system message filter.
AT+SYSMSGFILTERCFG: Query/Set the system message filters.
AT+SYSMFG: Query/Set manufacturing nvs User Partitions.
AT+SYSREG: Read/write the register.

1.2 Wi-Fi

Added more Wi-Fi AT commands:

AT+CWINIT: Initialize/Deinitialize Wi-Fi driver.
AT+CWSTATE: Query the Wi-Fi state and Wi-Fi information.
AT+CWRECONNCFG: Query/Set the Wi-Fi reconnecting configuration.

1.3 TCP/IP

Added more TCP/IP AT Commands:

AT+CIPV6: Enable/disable the network of Internet Protocol Version 6 (IPv6).
AT+CIPSTATE: Obtain the TCP/UDP/SSL connection information.
AT+CIPSENDL: Send long data in parallel in the normal transmission mode.
AT+CIPSENDLCFG: Set the configuration for the command AT+CIPSENDL.
AT+CIPSNTPINTV: Query/Set the SNTP time synchronization interval.
AT+CIPFWVER: Query the existing AT firmware version on the server.
AT+CIPSSLCCN: Query/Set the Common Name of the SSL client.
AT+CIPSSLCSNI: Query/Set SSL client Server Name Indication (SNI).
AT+CIPSSLCALPN: Query/Set SSL client Application Layer Protocol Negotiation (ALPN).
AT+CIPSSLCPSK: Query/Set SSL client Pre-shared Key (PSK) in string format.
AT+CIPSSLCPSKHEX: Query/Set SSL client Pre-shared Key (PSK) in hexadecimal format.
AT+CIPRECVTYPE: Query/Set socket receiving mode.

1.4 MQTT

Added more MQTT AT Commands:

AT+MQTTLONGCLIENTID: Set MQTT client ID
AT+MQTTLONGUSERNAME: Set MQTT username
AT+MQTTLONGPASSWORD: Set MQTT password
AT+MQTTALPN: Set MQTT Application Layer Protocol Negotiation (ALPN)
AT+MQTTSNI: Set MQTT Server Name Indication (SNI)

1.5 HTTP

Added more HTTP AT Commands:

AT+HTTPCGET: Get HTTP Resource
AT+HTTPCPOST: Post HTTP data of specified length
AT+HTTPCPUT: Put HTTP data of specified length
AT+HTTPURLCFG: Set/Get long HTTP URL
AT+HTTPCHEAD: Set/Query HTTP request headers

1.6 User

Added new User AT Commands:

AT+USERRAM: Operate user’s free RAM.
AT+USEROTA: Upgrade the firmware according to the specified URL.
AT+USERWKMCUCFG: Configure how AT wakes up MCU.
AT+USERMCUSLEEP: MCU indicates its sleep state.
AT+USERDOCS: Query the ESP-AT user guide for the current firmware.

2. Attention

Due to the long time without a new firmware release for ESP32-S2, this release has significant changes. If you want to know more information, please refer to some ESP32 release notes:

v3.3.0.0 v3.3.0.0 Release Notes

v3.3.0.0 is released for ESP32-C2 and ESP32-C3. The changes since the previous version are as follows.

ESP32C2-AT

Documentation for Release v3.3.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v3.3.0.0/esp32c2/index.html ESP32C2-AT v3.3.0.0 is a major update for ESP32C2-AT v3.1.0.0.

The firmwares:

This is the list of changes since release v3.1.0.0:

Breaking Changes

esp-idf version updated to v5.0.6

1. Feature 1.1 TCP/IP

Added the AT+CIPSSLCPSKHEX command to set SSL client pre-shared key in hexadecimal format
Added the AT+CIPRECVTYPE command to set recv mode for each connection
AT+CIPRECVLEN query command can return the real data length now

1.2 Application Layer

AT+CIPSNTPCFG: Added timezone query and timezone set when SNTP was disabled
AT+MQTTCONNCFG: Enlarged lwt msg length to 128 bytes
Added the AT+MQTTSNI command to set MQTT server name indication

2. Bugfix 2.1 Wi-Fi

AT+CWLAP: Fixed an issue where executing AT+CWLAP may return an ERROR when the AT+CWRECONNCFG command is sent immediately after the Wi-Fi disconnection

2.2 TCP/IP

AT+PING: Fixed an issue that cannot ping a linklocal ipv6 address
Fixed an SSL issue where "CLOSED" was output before reading all data in passive mode
Fixed a potential SSL crash if mbedtls dynamic buffer feature is used and SSL renegotiation occurs
Fixed an issue where esp-tls is unable to parse ECC keys

2.3 System

Fixed the issue that AT+SYSMFG read operation returned wrong length
Fixed the issue where AT cannot work immediately after restart and prompt ready
Fixed an AT+SYSFLASH crash issue if read a large amount of data

3. Optimization

Optimized sntp startup delay and receive timeout to speedup sntp time acquisition
Disabled relinker feature to get rid of potential crashes
Optimized the available ram size
Re-organized the gitlab ci
Re-organized the main directory of the esp-at repository
Added some debug options to allow different kinds of esp-at debug output

ESP32C3-AT

Documentation for Release v3.3.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v3.3.0.0/esp32c3/index.html ESP32C3-AT v3.3.0.0 is a major update for ESP32C3-AT v3.2.0.0.

The firmware:

ESP32-C3-MINI-1-AT-V3.3.0.0.zip

This is the list of changes since release v3.2.0.0:

Breaking Changes

esp-idf version updated to v5.0.6
RF power: Fixed an issue where the actual wifi transmit power didn't match the settings. The default configuration of wifi transmit power is 19.5 dBm, but the actual wifi transmit power may be slightly lower than the settings, this is because the wifi transmit power is limited by your country code according to phy_multiple_init_data.bin configuration. In the current version, esp-at disabled multiple phy init data bin to improve the wifi transmit power (RF power is no longer limited by your country code).

1. Feature 1.1 TCP/IP

Added the AT+CIPRECVTYPE command to set recv mode for each connection
AT+CIPRECVLEN query command can return the real data length now

1.2 Application Layer

AT+MQTTCONNCFG: Enlarged lwt msg length to 128 bytes
Added the AT+MQTTSNI command to set MQTT server name indication

2. Bugfix 2.1 Wi-Fi

AT+CWLAP: Fixed an issue where executing AT+CWLAP may return an ERROR when the AT+CWRECONNCFG command is sent immediately after the Wi-Fi disconnection
Fixed an issue where init and deinit the wifi could lead to Wi-Fi scan issue

2.2 TCP/IP

AT+PING: Fixed an issue that cannot ping a link-local ipv6 address
Fixed an SSL issue where "CLOSED" was output before reading all data in passive mode
Fixed a potential SSL crash if mbedtls dynamic buffer feature is used and SSL renegotiation occurs
Fixed an issue where esp-tls is unable to parse ECC keys

2.3 System

Fixed the issue where AT cannot work immediately after restart and prompt ready
Fixed an AT+SYSFLASH crash issue if a large amount of data is read

2.4 Bluetooth

Fixed ble init fail issue
Fixed ble disconnection will crash issue
Fixed ble connection timeout issue

3. Optimization

Optimized SNTP startup delay and receive timeout to speed up SNTP time acquisition
Re-organized the GitLab CI
Re-organized the main directory of the esp-at repository
Added some debug options to allow different kinds of esp-at debug output

v4.0.0.0 v3.2.0.0 v3.2.0.0 Release Notes

v3.2.0.0 is released for ESP32 and ESP32-C3. The changes since the previous version are as follows.

ESP32-AT

Documentation for Release v3.2.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v3.2.0.0/esp32/index.html
ESP32-AT v3.2.0.0 is a major update for ESP32-AT v2.4.0.0.

The firmwares:

ESP32-WROOM-32-AT-V3.2.0.0.zip
ESP32-SOLO-AT-V3.2.0.0.zip
ESP32-PICO-D4-AT-V3.2.0.0.zip
ESP32-MINI-1-AT-V3.2.0.0.zip
ESP-AT will not release firmwares for ESP32 WROVER series

This is the list of changes since release v2.4.0.0:

Breaking Changes

esp-idf version updated to release/v5.0 (24b9d38a)
AT+SYSFLASH: If you previously used v2.4.0.0 firmware and now directly flash v3.2.0.0 firmware, and MCU reads/writes parameters through AT+SYSFLASH command, the two versions will return different data, causing incompatibility (because v2.4.0.0 reads/writes parameters using partition method, while v3.2.0.0 uses NVS method). You can choose any of the following methods to resolve the compatibility issue:
- Modify MCU code. For v2.4.0.0 firmware version, use AT+SYSFLASH command to read/write parameters; for v3.2.0.0 firmware version, use AT+SYSMFG command to read/write parameters.
- Upgrade to v3.2.0.0 firmware using AT+USEROTA or AT+CIUPDATE command instead of directly flashing firmware.
- Customize AT firmware. In the firmware released with v2.4.0.0, replace the esp-at.bin file with the esp-at.bin file from v3.1.0.0, and recompile it into a new 4MB firmware.
AT+RFPOWER: The default value of ble tx power changed from 2 to 0

1. Feature 1.1 Wi-Fi

AT+CWSTAPROTO and AT+CWAPPROTO commands added WIFI_PROTOCOL_LR support
Added the AT+CWINIT command to init or deinit Wi-Fi
AT+WEBSERVER: Wi-Fi provisioning supports special characters in SSIDs and passwords

1.2 TCP/IP

Added the AT+CIPFWVER? command to query firmware versions
AT+CIUPDATE: Added CDN network support
Added the AT+TRANSINTVL command to support configurable intervals in passthrough mode

1.3 Application Layer

Added the AT+MQTTLONGCLIENTID command to set MQTT client ID
Added the AT+MQTTLONGUSERNAME command to set MQTT username
Added the AT+MQTTLONGPASSWORD command to set MQTT password
Added the AT+HTTPCHEAD commands to set more request headers
Added AT+HTTPCPUT command to put HTTP data of specified length
AT+HTTPGETSIZE: Added tx_size, rx_size, timeout parameters
Added WebSocket AT commands
AT+WEBSERVER: Added the customized partition upgrade function
AT+CIPSNTPCFG: Added timezone query and timezone set when SNTP was disabled

1.4 System

Added the AT+SYSMSGFILTER and AT+SYSMSGFILTERCFG commands to filter system messages
Added the AT+USERWKMCUCFG and AT+USERMCUSLEEP commands to wake up MCU
Added esp_at_get_para_as_float() API to get the float type parameter

1.5 Bluetooth

AT+BLUFI: BluFi supports getting AP lists and sending custom data
AT+BLEWL: Added ble whitelist command
AT+BLUFINAME: Modified maximum length of BluFi name to 29 bytes
AT+SAVETRANSLINK: Support Bluetooth LE passthrough mode
AT+BLERDRSSI: Support reading the RSSI of Bluetooth LE connection
Support sending exchange MTU requests when init server role

2. Bugfix 2.1 Wi-Fi

Fixed that Wi-Fi mode was changed after waking up from deep sleep (AT+GSLP)
Fixed that AT+CWQIF fails to disconnect the station if connected by multiple stations
Fixed that AT+CWJAP returned the wrong reason code sometimes
Fixed the crash caused by frequently enabling and disabling web server (AT+WEBSERVER)
Fixed that Wi-Fi stopped reconnection if AT+BLUFI command was sent
Fixed the issue of occasional network configuration failure in smartconfig (due to the lack of SSID validity check, which resulted in incorrect Wi-Fi auto-connection after power-up, further terminating the smartconfig network configuration).
Fixed a potential issue that SoftAP could not work if powered down when saving the SoftAP configurations
AT+CWJEAP: Fixed the issue that the EAP-TLS method does not work due to the last byte of PKI was not NULL terminated
Fixed that AT+RFPOWER command could not set ble tx power when Wi-Fi mode was 0

2.2 TCP/IP

Fixed that AT+CIPSTO could not work in passthrough mode
Fixed that AT+CIPTCPOPT cannot work if AT works as a server
Fixed that AT+CIPTCPOPT query command may return the wrong keep-alive value
Added a workaround that AT+CIPCLOSE might block forever if ESP-AT works as a TCP client and SO_LINGER option is set (due to the LwIP SO_LINGER issue in some cases)
Fixed that AT+CIPRECVDATA may cause a busy p issue
Fixed that AT+CIPSSLCCONF, AT+CIPSSLCCN, AT+CIPSSLCSNI, AT+CIPSSLCALPN, AT+CIPSSLCPSK, AT+CIPTCPOPT returns multiple items in single connection
Fixed a type and remote host parameter unmatched issue in AT+CIPSTART command
Fixed a potential crash if the hostname length is bigger than 64 bytes in AT+CIPSTART command
AT+CIPSEND: Fixed a data sent issue due to the changed link_id
Fixed that AT+CIUPDATE returned ERROR if the OTA server returned too many OTA versions
Fixed that AT+CIPSTART could not establish multiple UDP transmissions on the same port
Fixed the issue of TLS connection failures caused by incorrect CN settings
Fixed the issue of returning OK when setting AT+CIPSERVER twice

2.3 Application Layer

Fixed that AT+HTTPURLCFG? returned the wrong URL
Fixed that rx_size parameter could not work when set to 0 in AT+HTTPCGET command
Fixed that AT+HTTPCPOST response returns the wrong command name if appended more post data
Fixed the issue of AT blocking when MQTT broker actively closed MQTT client connection

2.4 System

Fixed that busy p issue if an SSL connection was established and data was read in a weak network
Fixed that GPIO32/GPIO33 could not work as UART pins due to conflict with the external 32 KHz crystal oscillator configuration
Fixed that esp_at_port_write_data() crashed if input length < 0
Fixed the high power consumption in light sleep if set the wake-up source
Fixed the memory leak issue of AT+FS command
SPI: Fixed a global issue where incorrect length was returned when reading data by SPI (For example, AT+HTTPCPOST command cannot read out all the data from SPI due to wanted data length being returned instead of the actual data length)

2.5 Bluetooth

Fixed that device name was missing in adv packets
Fixed some BluFi issues
Fixed the issue of occasional restart caused by the AT+BLEGATTCPRIMSRV=0 command
Fixed the ble tx power set fail issue

2.6 Tools

Fixed that factory firmware cannot be generated on Windows OS
build.py: Installed compilation environment depends on the target
build.py: Used the python of esp-idf environment instead of external deprecated python
at.py Support modifying manufacturing NVS

3. Optimization

Refactored the storage mode of factory parameters to use the manufacturing NVS operation instead of partition operation. (see Why are we using manufacturing nvs way on the master? for more details)
Simplified GitHub CI workflow
Enabled power_management for the station when disconnected (Chip will do modem-sleep when rf module is not in use any more)
Disable PMF to improve Wi-Fi compatibility when AT works in SoftAP mode
Used Python to generate fatfs.bin instead of the deprecated mkfatfs component
Support jihulab redirects in build.py
Migrated AT firmware resources from download.espressif.com server to dl.espressif.com server
Enhanced the documentation with the addition of more and detailed descriptions and addressed some document errors.

ESP32C3-AT

Documentation for Release v3.2.0.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v3.2.0.0/esp32c3/index.html
ESP32C3-AT v3.2.0.0 is a major update for ESP32C3-AT v2.4.2.0.

The firmwares:

ESP32-C3-MINI-1-AT-V3.2.0.0.zip

This is the list of changes since release v2.4.2.0:

Breaking Changes

esp-idf version updated to release/v5.0 (24b9d38a)
AT+SYSFLASH: If you previously used v2.4.0.0 firmware and now directly flash v3.2.0.0 firmware, and MCU reads/writes parameters through AT+SYSFLASH command, the two versions will return different data, causing incompatibility (because v2.4.0.0 reads/writes parameters using partition method, while v3.2.0.0 uses NVS method). You can choose any of the following methods to resolve the compatibility issue:
- Modify MCU code. For v2.4.0.0 firmware version, use AT+SYSFLASH command to read/write parameters; for v3.2.0.0 firmware version, use AT+SYSMFG command to read/write parameters.
- Upgrade to v3.2.0.0 fir...

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