Documentation for IDF v4.1.1 is available at https://docs.espressif.com/projects/esp-idf/en/v4.1.1/

ESP-IDF v4.1.1 is a bugfix update for ESP-IDF v4.1. ESP-IDF v4.2 is the latest stable release at time of writing.

ESP-IDF v4.1.x will be supported until February 2023, according to the ESP-IDF Support Policy.

Obtaining v4.1.1

For full installation instructions, see the ESP-IDF Programming Guide.

The source files attached to this release will not work due to our use of git submodules. Use one of the following methods instead:

Using git

To get this release, use the following commands:

git clone -b v4.1.1 --recursive https://github.com/espressif/esp-idf.git esp-idf-v4.1.1
cd esp-idf-4.1.1/

This is the recommended way of obtaining v4.1.1 of ESP-IDF.

Download an archive with submodules included

Attached to this release is an esp-idf-v4.1.1.zip archive. It includes .git directory and all the submodules, so can be used out of the box. This archive is provided for users who have connectivity issues preventing them from cloning from GitHub.

This archive can also be downloaded from Espressif's download server:
https://dl.espressif.com/dl/esp-idf/releases/esp-idf-v4.1.1.zip

Changelog

This is the list of changes since release v4.1:

Major Bug Fixes

Bluedroid: Fixed ‘Impersonation in the Passkey Entry Protocol’ Vulnerability: CVE-2020-26558
Bluedroid: Added comments to avoid ‘Impersonation in the Pin Pairing Protocol' Vulnerability: (CVE-2020-26555)
Bluedroid: Added comments to avoid ‘Authentication of the LE Legacy Pairing Protocol' Vulnerability.
Bluedroid: Fixed the issue that bluedroid may accept connection request if BD_ADDR of peer is same as ours (CVE-2020-26555).
Secure Boot: Fixed crash in app if signature verification fails (#6210)

Bluetooth

Classic Bluetooth

Controller

Fixed BT controller dead if CLKN overflow
Provided a workaround for an issue when entering sniff mode
Rewrite ld_acl_frm_isr to make clock read more precise and use less IRAM
Remove dummy assert when ESP32 receives a passkey request
Fixed incorrect time computation and replaced the use of "+" with CLK_ADD2()
Rewrite ld_acl_frm_isr to make clock read more precise
Fixed memory corruption caused by bluetooth memory release

Bluedroid

Separated BTA_JV_L2CAP to reduce bin size of SPP profile
SPP: Added API esp_spp_stop_srv()
SPP: Fixed the error parameter in spp examples (#5408)
SPP: Moved RFCOMM rx flow control in btc layer
SPP: Fixed the parameter size of API spp_vfs_write cannot exceed 1000
SPP: Fixed task watch dog when running SPP demo in VFS mode
SPP: Fix SPP using NULL pointer when bluedroid dynamic memory option is enabled
SPP: Added events if there are some internal errors when calling esp_spp_xxx API
HID: Added support for more Bluetooth HID devices (#5481)
HFP AG: fixed error of AG API return line (#5554)
HFP AG: fixed AG Example Outgoing Callback Not Triggered (#4967)
HFP: Enabled PCM config in menuconfig and controller
A2DP: Added information to Application layer that the A2DP is connecting to peer device
A2DP: Added reaction for A2DP SNK & SRC disconn req when no link up
A2DP: Added a2dp init & deinit state variable to inidcate a2dp statement
Separate A2DP and AVRC init procedure and set the sequence of initialization of them
Added bool open_fail to choose whether post disconnection event to app layer
GAP: Fixed read rssi delta issue in bredr (#5660)
GAP: Authentication fixes in Legacy and Secure Connection
GAP: Calling esp_bt_gap_get_bond_device_list in some scenarios may return invalid Bluetooth address (#5395)
GAP: Fixed redundant events of ESP_BT_GAP_DISC_STATE_CHANGED_EVT occurring in registering GAP callback function
Added BTC Init failure protection
Changed state machine set before EVT up to APP layer in some cases
Fixed BTC task name mismatch (#4966)
Fixed issue that bluedroid enable takes long time
Fixed the issue that state failed to synchronize between controller and host when disconnected
Fixed crash caused by calling a2dp_deinit directly when a2dp connected
Fixed ‘Impersonation in the Passkey Entry Protocol’ Vulnerability: CVE-2020-26558
Added comments to avoid ‘Impersonation in the Pin Pairing Protocol' Vulnerability: (CVE-2020-26555)
Added comments to avoid ‘Authentication of the LE Legacy Pairing Protocol' Vulnerability.
Fixed the issue that bluedroid may accept connection request if BD_ADDR of peer is same as ours (CVE-2020-26555).

Bluetooth Low Energy

Controller

Added BLE connection paramter check
Fixed channel map instant reverse
Fixed the issue that supervision timeout in LLC DISC busy state can not disconnect
Fixed cache disable crash
Fixed tx_prog insert error
Changed the default value of the TxOctets support length from 27 to 251
Fixed hci timeout, added timer to monitor scan event
Fixed assert(9, 10) when rx and evt_end interrupts exist at the same time, use the information of rx to determine the execution order
Fix ble assert(1024, 0), ADV_UNDERRUN error
Fixed ble assert(512, 0), IFS_UNDERRUN error
Fixed assert(10, 9) when the AFPM happens
Fixed exl200, add btdm_disable_adv_delay, fix RPA addr update error
Fixed the problem of early release of pointer(p_ccb) in function
Fixed HCI Timeout by 0x40F or 0x41C by freeing ACL RX Buffer in Exchange Memory
Added protection for ACL-U packet type exchange procedure
Fixed a potential double free error

Bluedroid

Added support of BLE Authorization
Added support of BLE Application Layer Encryption key size check
Added support of BLE Read Attribute value by UUID
Added support of BLE Non-Resolvable Private Address setting
Fixed BLE incorrect encryption flag setting
Fixed the btu task watchdog timeout during multi-connection
Fixed name typo of BTA_GATTS_CREATE_SRVC_EVT event (#5446)

Blufi

Fixed the issue that sending longer customer data will cause congestion
Fixed the issue that the sequence still increases when Blufi is sending data on disconnection
Fixed an error caused by incorrect conn_id parameters
Add a macro to control the compilation of blufi

NimBLE

Added Non Resolvable Private Address support to existing Host based Privacy framework
Added header guards and closing bracket conditional for c++ in ble_hs_pvcy.h (espressif/esp-nimble#12)
Fixed repeated pairing failure in RPA (#5530)
Fixed potential issue with strncpy in os_mempool.c (apache/mynewt-nimble#843)
Check for received buffer size less than configured event buffer size
Fixed some bugs in NimBLE NVS storage and ble_eddystone
Remove recursive call (apache/mynewt-nimble#857)
Added missing MYNEWT_VAL_BLE_L2CAP_COC_MPS definition (#5825)

ESP-BLE-Mesh

Updated connection parameters used by Central
Added Node local NetKey & AppKey get/add/bind functions
New Kconfig options introduced to reduce code size
Fixed wrong description of BLE Mesh server model auto_rsp flag (#5966)
Fixed info not erased when deinit node with "erase_flag" set to true
No store pending timeout will be used when node is not provisioned or Provisioner is disabled with erase operation performed
Make mesh stack net buf debug option invisible
Updated mesh device property to v2
Check device role when enabling node/Provisioner functionality
Added mutex to protect settings operations
Optimized Provisioner erase info operations
Optimized Provisioner delete device function
Check if stack is initialized before initializing vendor client
Fixed not using the latest iv_index for provisioning
Synchronized a few BLE Mesh updates from Zephyr
- Using callbacks for model init operations
- Optimized model recv message operation
- Added net_buf_simple_init_with_data
- Porting the full implementation of tinycrypt
Avoid unnecessary assert in mesh stack
Fixed updating ccc handle incorrectly when using NimBLE host
Client model related miscellaneous optimizations
Fixed handling health current status incorrectly
Added proxy cfg pdu length check
Reworked using dev flag to check scan status
Added more checks of input provisioning bearers
Updated options of using PSRAM for BLE Mesh
Updated send_ttl in btc layer when receiving a message (#5300)
Added support to get node info with pre-configured node name (#5397)
Fixed compile error when only proxy enabled
Fixed the issue that recv_rssi of received messages is always 0 (#5505)
Added a few checks of model status with variable length
Added check of if subnet exists before updating beacon_sent
Fixed the issue of DO NOT #define bool when compiling in C++ (#5100)
Fixed wrong log output when using bt_hex
Fixed node failed to send messages to 0xFFFF
Added support of subscribing group address by a local model (#4044)
Added BLE mesh coex test demo

Wi-Fi Coexistence

Fixed an issue that BLE terminate ack packet cannot be received with a high probability in coex mode
Rewrite BLE dynamic priority in connection establishment
Rewrite BLE dynamic priority to fix ble disconn in conn_param_update/channel_map_update
Fixed status bit set error when conn fail
Fixed ble dynamic prio with latency
Reduced image size of Wi-Fi and Bluetooth by not linking coexist code

Wi-Fi

Update WiFi toolchain to 1.22.0-97-gc752ad5
Added Failure reason code for WPS event
Added IRAM_ATTR periph_ll_wifi_bt_module_enable_clk_clear_rst and IRAM_ATTR periph_ll_wifi_bt_module_disable_clk_set_rstto fit O0 optimization level
wpa_supplicant: fixed wpa memory leak in softap mode
wpa_supplicant: Allow NULL-padded WPS attributes
wpa_supplicant: Bypass WPS-Config method validation
wpa_supplicant: Deinit wpa2 states in wifi deinit
wpa_supplicant: added support for mbedtls tls handshake
wpa_supplicant: fixed invalid pointer deference and memleak
wpa_supplicant: fixed IOT issue with latest freeradius (#5273)
wpa_supplicant: fixed WPA3 and WPA2 transition related failures
wpa_supplicant: fixed linker errors depending on link order on some systems (#5641)
wpa_supplicant: increased PMK lifetime to 100 days
Replaced periph_module_enable/disable by periph_wifi_bt_common_module_enable which are in IRAM
Deleted duplicated spinlock and counter
Fixed the crash when wifi stops after deinit
Fixed an issue when setting TX DMA buffer above 32 would not take effect
Configure bandwidth and phy mode to store NVS
Added TBTT update when AP reset TSF
Fixed the issue of regdomian update
Added API to get available internal heap size
Fixed the issue of memory stepped on when reorganizing WiFi fragment packets
Do not reset softAP's TSF except it restarts
Added sending sta connection event again after ap sent disconnect event
Added API of setting/getting inactive time
Fixed the issue when station connects to hidden AP, fails to update rssi value of hidden AP
Set default AP handlers in wifi_create_and_start_ap() (#5844)
Fixed SPIFFS conflicts with WIFI when using SPIRAM (#5629)
Modified LR for ESP32
Optimize some debug logs for probe response
Fixed the issue of no event for connection
Fixed an issue for timestamp check, didn't disconnect AP when AP's timestamp decrease abnormally
Fixed obsolete interface gethostbyname (#4510)
Disabling Menuconfig option "Enable WPA3-Personal" now disables WPA3 code, reduces code size by around 7.7kB (#5971)
Fixed PMF related issue
Implemented ESPNOW + PMF coexistence
Optimize 4-way handshake failure time
Fixed null pointer dereferences in MGMT RX
Fixed esp_wifi log levels
Added wpa_supllicant debug logging as a configurable option
Fixed high loss ratio of receiving broadcast data on ESP32-S2 station when it connects to an ESP32-S2 softAP
Fixed links to example directories for fast_scan and scan (#5186)
Shortened the TCP timer intervals
Fixed an issue that PMF stop working after dynamic mode change
wpa_supplicant: Fixed NULL pointer dereference in EAP Client

ESP-WIFI-MESH

If a FIXED-ROOT root is set by esp_mesh_set_type or esp_mesh_set_parent, its ie.mesh_type will be changed to MESH_ROOT before it connects to the router
Release esp_mesh_recv_toDS when a root becomes a non-root
esp_mesh_set_type supports MESH_IDLE and MESH_STA
Fix ie.rc_rssi is not updated during scan and vote
Fix parent switch causes ie.mesh type does not match to ie.layer
Fix during root switch, the original root doesn't disconnect from the router after it receives the switch request from the new voted root. (root switch happens by invoking esp_mesh_waive_root)
Fix the routing announce timer is not stopped right after a non-root becomes a root
Modify to select a parent candidate with less ie.assoc when doing parent switch
Remove coexist warnings in ESP_WIFI_MESH
Fix a FIXED-ROOT root does not reconnect to the router when the disconnect reason is too many
Add esp_mesh_print_scan_result for debug
In flush_upstream_packets, modify not to clear the values of mesh_xonseq for node itself and children nodes
Modify not switch to a parent candidate which has the same layer and assoc as the current parent
Fix parent monitor function isnot triggered anymore when the parent candidate is cleared without sending an event to mesh layer
Fix a new voted root does not reconnect to the router if the rssi is weak

Ethernet

Added Ethernet driver flow control
Added the support of pin emac task to core
Fixed Ethernet RX issue, handle rx early event
Support PHY power on timeout (#5425)
Insert mininum assert time for PHY HW reset (#5528)
Fixed C++ linkage moving extern "C" after includes (#5699)

Peripheral Drivers

ADC: fixed DAC influenced by ADC bug by disabling the synchronization operation from ADC1 to DAC
ADC: fixed hall read, invert, pattern table issues
ADC: fixed GPIO init bug in DMA mode on ESP32
FREEMODBUS: highlight long frame buffer limitations in the documents
FREEMODBUS: fixed event processing failure after driver destroy (#5275)
I2C: fixed issue of I2C slave rxfifo_full interrupt enabled incorrectly
I2S: fixed I2S word-order issue caused by incomplete reset (#5410)
MCPWM: fixed fault pin initialization issue
PCNT: fixed issue in clear interrupt status
RMT: fixed TX data truncated issue when memory block > 1 (#5992)
RTCIO: fixed the issue in force hold disable
SPI: Set CS polarity correctly
SPI: turned off DMA before CPU reset to avoid memory corruption after the reset
TWAI: fixed size of RX message count field on ESP32
TWAI: removed asserts used for program logic
UART: fixed RXFIFO_CNT bug on ESP32
UART: fixed issue that uart_wait_tx_done return ESP_OK when failed
UART: fixed uart module reset issue
UART: fixed uart_ll_is_tx_idle to inline into handler correctly when opt for size (#5694)
UART: apply FORCE_INLINE_ATTR to all UART LL functions to inline them ccorrectly with "-O2" option
PSRAM: Fixed the read id failure for 16mbit PSRAM
SDMMC: fixed the probe issue that forbid sdspi working in high speed mode
SDMMC: Added support of checking slot_config for null before using it (#5000)

Core System

Added soft solution for esp32 eco3 live lock issue
Added PSRAM stack check in backtrace
FreeRTOS: Increased portmux timeouts to avoid crashing when using debug feature (#3629)
FreeRTOS: Fixed clobbering of a4 while spilling register windows (#5758)
panic: Skip over the first invalid PC in case of InstrFetchProhibited
FreeRTOS: Fixed compilation warning at -O2 level (#5525)
shared_stack: Fixed task stack not being replaced by shared stack correctly
Fixed anti-rollback feature memory map bug for partition size greater than 3.2MB (#5911)
esp-event: AP_STAIPASSIGNED now passes the IP through 'event_data' (#3605)
pthread: Fixed the issue when pthread_mutex_destroy is used to release mutex, pthread_mutex_lock_internal is used which increased uxmutexehold and no recovery base priority
Switched SPIRAM stack in esp_restart_noos() to internal stack (#5107)
Added new esp_efuse_write_field_bit() convenience function

Debugging

core dump: fixed error reported for blank partition
core dump: fixed size of memory region read by espcoredump.py

newlib libc

Fixed adjtime, returns the amount of time remaining from any previous adjustment (#5194)

LWIP

esp_netif: Removed restarting DHCP client/server if it has already been started
esp-netif: ppp netif to use netif_is_link_up() to update interface state (#5069)
esp-netif: fixed PPP interface to call set_default_netif() from lwIP context
esp_netif: Added support for Tx by reference (optimization for WiFi TX performance)
Fixed the issue with Ping using custom payload size receiving fixed size
Updated LwIP TCP rto time to be configurable
IPv6: Fixed the issue that packets exceeding MTU can still be sent and received when IP fragmentation is turned off
IPv6: Fixed the issue that IPv6 ND6 queuing too much packets cause no memory issue
IPv6: Fixed sending ipv6 multicast data when source address is null
IPv6: Fixed the issue of failing to send ipv6 ping packet
Fixed the issue of UDP packets loss in ARP in UDP tx performance testing
Added custom TCP initial sequence number (ISN) randomization hook
Fixed missing C++ header guards in netdb.h (#5900)
Fixed the issue that the structure cannot contain IPv4 and IPv6 at the same time
Fixed bug for tcp recv assert

mDNS

Added support for queries in responses, so the mDNS responder works correctly with lwIP resolver (#5521)
Fixed query ID in responses (#5574)
Fixed wrong mdns source address if lwIP zoning disabled (#6055)
Fixed the resolver to accept non-strict answers (allowing non empty question field within answers)

Provisioning

BLE provisioning: added check for valid ble read offset (x)
protocomm_httpd: Restart security session if request is received on a new session
Use memcpy instead of strncpy for copying SSID (#5866)
wifi_provisioning_manager: fixed issue faced while adding 2 or more endpoints in wifi_provisioning_manager

TCP Transport

Fixed issue in SSL mode: if esp_transport_poll_read function is used, the cache data in mebdtls will block
Fixed internal DNS resolve function to use getaddrinfo() instead of gethostbyname()

HTTP Server

Fixed an issue which could cause issues with LRU purge
Updated LRU counter on accepting a new connection (#3851)

HTTP Client

Fixed error handling in esp_http_client_read and esp_https_ota_perform (#4960)

mbedTLS

Updated to mbedTLS release v2.16.7
Fixed result of mpi_montgomery_exp_calc() when Z is not initialized (#5605)
Don't compile hardware MPI & SHA files if disabled in config

ULP

ulp: fixed ULP assembler version detection for localized systems

Bootloader

Fixed bootloader_common_get_sha256_of_partition() which can handle a long image ()
bootloader_support: don't check signature when JTAG is attached (#4734)
Fixed esp_get_flash_encryption_mode() (#5747)

ESP-TLS

esp_tls_wolfssl: fixed incorrect error message after handshake fails
esp-tls: enabled TLS renegotiation using explicit API call
openssl: Fixed verification mode conversion to mbetls modes to make it more strict

Websocket

Updated the client to abort the connection if send fails
Fixed possible deadlock if stop called from event handler
Fixed posting the disconnect event twice on read error
Fixed possible deadlock in starting the client after being stopped while sending data
Updated the client to block timeout times when set disable_auto_connect

ESP-MQTT

SSL: Added config option for skipping common name check (espressif/esp-mqtt#158)
SSL: Added support for tls with secure element (ATECC608A) (espressif/esp-mqtt#156)
Websocket: Allow the query part of the uri to be a part of the path (espressif/esp-mqtt#161)
Config: Add check for consistency between config settings
Fixed esp_mqtt_client_stop deadlock ( espressif/esp-mqtt#163)
Added dispatch error event for read errors (#5704)
Cleanup expired messages when offline (#5668)
Renamed error type MQTT_ERROR_TYPE_ESP_TLS to MQTT_ERROR_TYPE_TCP_TRANSPORT
Added configuration value to set network timeout
Used size_t for all lengths to allow for other architectures
mqtt_outbox: Removed unused retry_count field from outbox_item_t
config: Fixed typo for configuring OUTBOX_EXPIRED_TIMEOUT_MS
Fixed missing MQTT_API_UNLOCK in esp_mqtt_client_stop error path (espressif/esp-mqtt#173)
Added esp_mqtt_client_get_outbox_size API
Added config value to disable keepalive mechanism

Security

Secure Boot: Fixed Secure Boot signing step on Windows when using CMake (#5557)
Secure Boot: Added cpp macro guards in esp32 secure boot rom functions (#5878)
Secure Boot: Fixed enabling of Secure Boot V2 with pre-burned key digest (#6050)
Added ESP32 V3 "UART Download Disable" efuse option
Secure Boot: Fixed the issue when the bootloader image size is exactly equal to the size between the bootloader offset and partitions offset when secure boot v2 and flash encryption are enabled
Secure Boot: Fixed the issue which checks the signature block digest instead of the flash digest during OTA validation (note: not a security issue as the bootloader will still refuse to boot the incorrectly signed app and fall back to the existing one.)
Secure Boot: Fixed crash in app if signature verification fails (#6210)

Storage

NVS: Allow specifying custom partition by esp_partition_t pointer (#5172)
vfs: Support setting UART line endings for specified UART number
SPI_FLASH: Don't call vTaskDelay in non-os context, fixing situation when coredump is triggered from an interrupt handler
SPI_FLASH: fixed the write performance regression in new API after v4.0
SPI_FLASH: fixed the regression of non-quad mode by default chip driver, bugs in CS init, and add_device

Power Management

Sleep: enable sleep reject when entering light sleep

External Libraries

Updated to mbedTLS release v2.16.7

Tools

Update toolchain to esp-2020r3
Toolchain: disable C++ exception FDE sorting to save RAM
Updated OpenOCD version to 'v0.10.0-esp32-20200709'
Added deprecation warning for Python 2 and Python 3.5 and older
C++: fixed non-working init_priority attribute and moved all C++ init tests to separate file (#5038)
Don't generate pyc files
idf.py: Added "idf.py python-clean" command to clean Python bytecode files
idf.py: Now disables CMake uninitialized variable warnings by default (#5753)
Mention ESPPORT and ESPBAUD in idf.py --help (#5461)
mfg_util: Update file handling to maintain line endings across various OS (#4888)
Fixed Python 3 incompatibility for building with Eclipse on Windows
gdb: Modify PC in case of invalid PC
docker: Added libpython2.7 in order to satisfy GDB dependencies (#5817)
Fixed path handling errors in gen_esp_err_to_name.py for Windows
ldgen: Added support for paths with Unicode characters in archive files parsed by ldgen (#5996)
esptool: Updated to fix Python 3 key generation for Secure boot v2 (#5786)
parttool.py: Add file stream parameter and log stdout and stderr to same stream
Added check for existence build directory

Build System

cmake: Fixed issue with setting defaults in idf_build_process (#5053)
cmake: Fixed C identifier generation from embedded file (#4927)
idf_as_lib example now places sdkconfig file outside the build directory
Now always logs the sdkconfig file path from CMake (#5251 (comment))

Examples

ble_mesh: Fixed example README & tutorial link errors
ble_mesh: Added more checks of input parameters
ble_mesh: Added nvs operations for some mesh examples (#5359)
ble_mesh: Added result check of mesh initialization
ble_mesh: Fixed example compile warning (#5745)
ble_mesh: Fixed sensor data wrong iteration (#5818)
ble_mesh: Delete local variables to avoid null global variables in coexistence example
Gatt_Client_Example_Walkthrough: added 128-bit UUID description
ble_hid_device_demo: fix build if building with c++ (#5191)
Example connect: Added unregister shutdown handler on disconnection in Common connect component
PPPoS Client: fixed esp_modem switch mode timeout and RX timeout interrupt (#3506, #4324)
PPPoS client: fixed UART configuration to use REF_TICK and install the driver after proper config (#4616, #4904, #4801)
[esp_local_ctrl_example] fixed expired x509 certificate
Fixed an issue in IPerf example
Fixed a broken link to examples/temp_sensor_esp32s2

Documentation

Added documentation for ble_hs_pvcy_rpa_config() API in its declaration
Added note about ESP-IDF FreeRTOS version
Added description of python-clean command
Added profile file name used by zsh shell
Fixed setup instructions in the main README and fixed broken links
Updated Versions file in line with the latest Support Policy document
Removed potentially confusing links to building the toolchain from scratch from from Getting Started guide
Specify that sleep wakeup source restrictions apply to all current ESP32 revisions (#4681)
Updated Chinese translation for get-started/index.rst file and fixed minor mistake in the EN version of the file

espressif/esp-idf v4.1.1 ESP-IDF Release v4.1.1 on GitHub

Obtaining v4.1.1

Using git

Download an archive with submodules included

Changelog

Major Bug Fixes

Bluetooth

Classic Bluetooth

Controller

Bluedroid

Bluetooth Low Energy

Controller

Bluedroid

Blufi

NimBLE

ESP-BLE-Mesh

Wi-Fi Coexistence

Wi-Fi

ESP-WIFI-MESH

Ethernet

Peripheral Drivers

Core System

Debugging

newlib libc

LWIP

mDNS

Provisioning

TCP Transport

HTTP Server

HTTP Client

mbedTLS

ULP

Bootloader

ESP-TLS

Websocket

ESP-MQTT

Security

Storage

Power Management

External Libraries

Tools

Build System

Examples

Documentation

espressif/esp-idf v4.1.1
ESP-IDF Release v4.1.1

on GitHub