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Showing content from https://github.com/espressif/esp-at/releases/tag/v4.1.1.0 below:

Release v4.1.1.0 · espressif/esp-at · GitHub

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 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

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

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
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 an issue where the patch could be applied multiple times

Examples

Added the fatfs_to_http_server example
Added the http_get_to_fatfs example
Added the WebSocket example document
Added the AT interface security example

Documentation

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

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