Documentation for pre-release v4.4-rc1 is available at https://docs.espressif.com/projects/esp-idf/en/v4.4-rc1/

ESP-IDF v4.4-rc1 is the release candidate for the upcoming v4.4 release. v4.4 release will be a minor update for ESP-IDF v4.3.

Obtaining v4.4-rc1

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 v4.4-rc1 --recursive https://github.com/espressif/esp-idf.git esp-idf-v4.4-rc1
cd esp-idf-v4.4-rc1/

This is the recommended way of obtaining v4.4-rc1 of ESP-IDF.

Download an archive with submodules included

Attached to this release is an esp-idf-v4.4-rc1.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/github_assets/espressif/esp-idf/releases/download/v4.4-rc1/esp-idf-v4.4-rc1.zip

Changelog

This is the list of changes since release v4.3:

⁽¹⁾: Some of the bug fixes listed here have also been backported to release/v4.3 branch and are available either in v4.3.1 or in the v4.3.2 release. Such bug fixes are marked with ⁽¹⁾.

Major New Features

Support for ESP32-S3 SoC
- Wi-Fi
  - 802.11 bgn mode
  - 802.11 LR mode
  - Station, SoftAP, sniffer mode
  - ESP-NOW
  - CSI support
  - TX/RX A-MPDU, TX/RX A-MSDU
  - TX Fragment, TXOP
  - WEP/TKIP/CCMP
  - WPA/WPA2-PSK/WPA2-ENT/WPA3-PSK/WPA3-ENT
  - WAPI-PSK
  - ESP-Touch v1/v2
  - Fine Time Measurement (FTM)
  - Device Provisioning Protocol (DPP)
  - Network-assisted roaming using 802.11k (Radio Measurements) and 802.11v (BTM) specifications
  - Wi-Fi Mesh support
  - Wi-Fi GCMP
  - Wi-Fi modem sleep and light sleep
- Bluetooth
  - BLE 5.0 Controller support
  - HCI support
  - Bluedroid host support with BLE 5.0
  - NimBLE host support with BLE 5.0
  - BLE-Mesh support
- Wi-Fi & BLE coexistence
  - Hardware arbiter based coexistence mechanism
  - Application scenarios based scheme coexistence mechanism
- Security
  - Secure boot
  - Flash & PSRAM encryption
  - RSA accelerator
  - AES accelerator
  - SHA accelerator
  - HMAC peripheral
  - Digital Signature
- Peripherals
  - UART
  - Timer group
  - GPIO
  - Dedicated GPIO (custom CPU instructions)
  - SPI Master
  - SPI Slave
  - I2C
  - I2S
  - LEDC
  - PCNT
  - RMT
  - USB Device
  - ADC
  - Camera interface
  - LCD interface
  - MCPWM
  - Touch sensor
- System features
  - SPI Flash
  - OTA
  - Task, interrupt watchdogs
  - CPU instruction extensions for DSP/AI
  - Efuse API and espefuse.py
  - esp_timer
  - DFU flashing
- Build system and tools
  - Building the project using CMake (build, flash, monitor, menuconfig)
  - "idf.py size"
- Sleep modes
  - Light sleep
  - Deep Sleep
  - DFS
  - Automatic light sleep and esp_pm power management
- Debugging
  - OpenOCD
  - Core Dump
  - GDB Stub
- Protocols
  - Provisioning
  - Other protocols on top of TCP/IP
Preview of ESP32-H2
- Add ESP32H2 build target
- IEEE 802.15.4: Add IEEE 802.15.4 component, support IEEE 802.15.4 driver with pre-build library
- IEEE 802.15.4: Add zigbee pending mode and config coordinator API
- IEEE 802.15.4: Set ieee80154 default PTI to 6
- Add clk root select in rtc_clk on ESP32-H2
- Delete RC8M enable in rtc_clk on ESP32-H2
- Add RC32K CLK in rtc_clk on ESP32-H2
- RC32K replaced 8MD256 in rtc_clk_cal on ESP32-H2
- Enable blink example.
- ESP32-H2 PHY refactor
More support for ESP32-C3 SoC
- Support phy calibration data save to nvs for ESP32-S2, ESP32-C3 & ESP32-S3
- secure_boot_v2: Supported SB_V2 for ESP32-C3 ECO3 ⁽¹⁾
- secure_boot: Secure Boot V2 verify app signature on update
- HMAC: Added Downstream JTAG enable mode for ESP32-C3
- Support I2S on ESP32-C3
- GPIO: Fast GPIO (CPU instruction driven) driver support on ESP32-C3
- ADC: Added an ADC single read and calibration example for all chips
- efuse: Added support custom MAC address stored in the eFuse for ESP32-C3, ESP32-S2, and ESP32-S3
- XTWDT: Added basic support for xtal32k watchdog timer for ESP32-S2/ESP32-S3/ESP32-C3
- coredump: Add ESP32-C3 support
- apptrace: ESP32-C3 support
More support for ESP32-S2 SoC
- ESP-BLE-MESH: Add support for external memory policy for ESP32-S2 ⁽¹⁾
- Support phy calibration data save to nvs for ESP32-S2, ESP32-C3 & ESP32-S3
- secure_boot: Secure Boot V2 verify app signature on update
- LCD: Added parallel LCD driver for ESP32 and ESP32-S2
- USB: Add preliminary USB Host Library support for ESP32-S2 and ESP32-S3
- ADC: Added an ADC single read and calibration example for all chips
- efuse: Added support custom MAC address stored in the eFuse for ESP32-C3, ESP32-S2, and ESP32-S3
- XTWDT: Added basic support for xtal32k watchdog timer for ESP32-S2/ESP32-S3/ESP32-C3
- Gcov: Add ESP32-S2 support
More support for ESP32 SoC
- secure_boot: Secure Boot V2 verify app signature on update
- LCD: Added parallel LCD driver for ESP32 and ESP32-S2
- ADC: Added an ADC single read and calibration example for all chips

Breaking Changes

Bootloader: The default app configuration is only compatible with bootloader and partition table generated from ESP-IDF V3.1 or newer. Apps that need to support OTA update on bootloaders and/or partition tables from older ESP-IDF must enable the new configuration option "App compatible with bootloader and partition table before ESP-IDF v3.1". Additionally, in ESP-IDF v3.3, CMake build system failed to append MD5 checksum to the partition table even when the option was enabled. This bug was fixed before v4.0 release. If the bootloader and partition table were initially built with CMake and IDF v3.3.x, then the compatibility option should also be enabled.
FreeRTOS: upgrade to 10.4.3 - rename xTaskRemoveFromUnorderedEventList
Flash Encryption: Abort if flash encryption is not enabled in hardware but app is built with relevant config
Build System: In previous versions of CMake build system, components found in EXTRA_COMPONENT_DIRS were applied after the project's default components directory (meaning if both contained a component with same name, the EXTRA_COMPONENT_DIRS component was built). In this version, the priority is reversed and a component in the project components directory has priority.
http2_request/sh2lib: The "sh2lib_connect" API now now take sh2lib configurations as input instead of connection uri.
tools: Users with Python 3.5 or older will have to install a recent Python version
Always compile with -fno-jump-tables -fno-tree-switch-conversion by default. This could results in performance regression for code that relies heavily on this optimization. See api-guides/memory-types.rst for how to enable it for specific source files if necessary.
partition_table: App partitions can not have empty sybtypes (need to define them).
partition_table: Data partitions with a empty sybtypes will be ESP_PARTITION_SUBTYPE_DATA_UNDEFINED = 0x06 instead of 0.
partition_table: otadata partition can be only with size 0x2000 and be only one in the partition table.
FreeRTOS: xSemaphoreAltTake and xSemaphoreAltGive APIs have been deprecated.
ESP_HID: Now BT HID APIs event will go through BTC->BTU->HCI.
soc: Registers APB_CTRL are renamed to SYSCON

Known Issues in v4.4-rc1

I2S: Wrong return codes for partial data transfers to/from DMA memory.
Useable stack size on ESP32-S3 is smaller than on other chips which may lead to IPC stack overflow on ESP32-S3.
On ESP32-S3, DMA may fail to access to RTC memory because RTC fast memory's speed is slow. Try to set this kind of memory's priority lower when allocating from heap may be a temporary workaround before next bugfix version.
On ESP32-S3, enabling Wi-Fi conflicts with USB functionality (#8241).

Known issues are planned to be fixed in the next bugfix release, v4.4.1.

IEEE 802.15.4

Added IEEE 802.15.4 component, support IEEE 802.15.4 driver with pre-build library
Added Zigbee pending mode and config coordinator API
Set IEEE 802.15.4 default PTI to 6

OpenThread

Added OpenThread submodule
Added OpenThread porting for ESP32
Added OpenThread cli example
Added otPlatRadioSetMacKey and otPlatRadioSetMacFrameCounter implementation.
Support microsecond timer
Added esp_openthread_netif_init() api for initializing the OpenThread lwIP interface.
Added OpenThread lwIP interface to the ot_cli example.
Updated OpenThread submodule to contain TCP message leak fix.
Added esp_cli_custom_command
Added TCP/UDP socket example
Fixed wrong uart read return value handling
Added esp_openthread_init esp_openthread_launch_mainloop and esp_openthread_deinit for simplified OpenThread initialization and launch logic.
Updated the OpenThread cli example with the simplified implementation.
Added the OPENTHREAD_BORDER_ROUTER Kconfig option
Added platform UDP and task queue port for the border agent feature
Added esp_openthread_border_router_* api
Added the esp_otbr example.
Porting and border routing features are now provided by prebuilt libraries
esp_openthread_netif_glue_init now requires platform config as its parameter
Enable ot_cli on ESP32H2-Beta chip
Enable multicast ping in OpenThread examples by default
Introduced a config option to enable/disable extended features in ot_cli example
Support ICMPv6 auto config
Support SRP service delegation
Publish _meshcop._mdns service
Added ftd.cmake for build FTD and radio.cmake for build RCP
Remove openthread-core-esp32x-config.h, added openthread-core-esp32x-cli-config.h and openthread-core-esp32x-rcp-config.h
Openthread enable ping sender module
Support discovery delegate in border router
Added iperf example
iperf: Support IPV6 address
iperf: Added new field len_send_buf, now iperf can set the length of sending buffer
iperf: Merge socket send/recv logic
OpenThread: Added menuconfig option to enable srp client
Enable dynamic logging
Reduce default log verbosity
Added esp_openthread_cli APIs
Added history support for OpenThread CLI

Bluetooth Controller

Fixed bluetooth controller task watchdog in Wi-Fi test
Delete the option: BLE ADV priority high
Added high level interrupt for Bluetooth
Fixed live lock issue in Bluetooth interrupt immediately, to make sure interrupt response speed
Fixed the assert in checking hardware sleep state during wake-up
Fixed rx interrupt flooding during BLE scan event in coexistence scenario, in the case that no Rx buffer is available.
Use correct addresses of Bluetooth Low Power Clock registers on Chip 7.2.8 ESP32-S3
Disabling asserts for the entire project (or setting silent) now applies to BT assert configurations
Fix for C2H flow control parameter check in Bluetooth controller. Required for Nimble Host flow control to work
Support ESP32-S3-Beta3 BLE
Created repository for BLE library files of ESP32-C3 and ESP32-S3, as a new submodule of ESP-IDF. Modify directory layout to better support multiple chips.
Fixed interrupt watchdog timeout during controller disable procedure for ESP32-S3/ESP32-C3
Fixed the Rx performance issue for coded PHY, especially in coexistence scenario for ESP32-C3/ESP32-S3
Fixed: Power down bluetooth module when deinit
Fixed the issue caused by the power off the BT/Wi-Fi power domain
Added change to free resources in deinit that were allocated during controller init procedure

Bluetooth Low Energy

Fixed the bug of modem sleep which may lead to the crash issue "assert(-218959118,0)"
Fixed controller do not report disconnect event to host
Fixed BLE disconnect due to connection parameters update
Fixed the start scan crash issue
Removed duplicate events in r_lld_evt_end
Fixed update exception list assert
Fixed no adv report in scan when using HW reconnect
Supported HW CCA
Fixed data length update rejected when controller is updating data length
Fixed BLE ACL Tx Flush issue during Reset/Reboot
Fixed the scan timeout report
Fixed that when EXT CRYS is configured but not detected, light sleep is still allowed to be used.
Fixed controller default LE Event Mask, the origin value is {0xFF,0xFF,0x0F,0x00,0x00,0x00,0x00,0x00}, the current value is {0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00}.
Fixed disconnection due to MIC failure (error code:0x3D) during pairing is fixed
Fixed BLE controller init failed due to version number mismatch for ESP32-S3
Fixed missing the sleep time
Fixed crash when shutdown bluetooth
Fixed modem sleep HW error
Fixed the BLE controller task watchdog timeout issue for ESP32-C3 and ESP32-S3

Classic Bluetooth

Fixed IRAM_ATTR missing in coex mode
Fixed crash in Bluetooth when esp_restart
Fixed some issues during light sleep and DFS
Fixed issue that function called in ISR is not labeled with "IRAM_ATTR" in Bluetooth Controller in ESP32-S3
Fixed wrong Tx Power level mapping and implemented Tx power set/get APIs
Modify E8192 ELx200 ELx40 log level to LOGD.
Fixed handling of invalid feature page response.
Fixed crash when lmp flooding
Fixed unable to initiate SCO connection when peer device not accept sniff mode
Fixed Link error of Bluetooth Kconfig
Decouple Wi-Fi and bluetooth with coexist to reduce binary file size
Fixed the scan failed issue
Fixed connection failed with LG 5.0 phone
Fixed crash after inquiry has finished
Fixed crash caused by bluetooth high level interrupt
Fixed the issue create Connection request is not properly terminated which blocks BlueZ from reconnecting
Fixed the issue bt_spp_acceptor example fails when SPP is initiated on a windows machine using Realtek Bluetooth adapter
Fixed the issue HCI_Read_Clock failed read local Bluetooth Clock

Bluedroid

Fixed the the code analysis report error reported by customer

Classic Bluetooth

SPP: Fixed a crash caused by pairing cancel
SPP：Added API esp_spp_stop_srv_scn to stop a specific server
SPP：Added parameter service_name with event ESP_SPP_DISCOVERY_COMP_EVT
SPP：Added parameter scn with event ESP_SPP_START_EVT
SPP：Added parameter scn with event ESP_SPP_SRV_STOP_EVT
HFP: Fixed crash in btc_hf_arg_deep_copy when name or number is NULL.
Fixed L2CAP Repeat CID
Shortened some log messages in bluedroid
HFP: Fixed build error for HFP-HF when bluedroid dynamic memory allocation is enabled.
HF-AG: Fix ag use dynamic memory error.
Fixed C3/S3 multi-connection failed when device acts as master and slave at the same time
A2DP: Fixed A2DP sink blocked issues.
SPP: Fixed SPP acceptor deadlock
A2DP: Fixed A2DP deint crash
SPP: Fixed SPP memory leak
SPP: Added some common FAQs in SPP Demo README.
Fixed the timer collision in function bta_sys_start_timer() used by role switch.
HFP: Fixed issue that acl can't disconnect when hfp_client disconnect.
Fixed the crash when using legacy paring with wrong pin code
A2DP： Fixed wrong clock_id in function time_now_us
HID: Added configuration of HID task stack size (#6385)
HID: Added BTC layer and API for HID host
HID: Support HID Device role over BR/EDR
HFP：Fixed single-tone sample sequence generation error in HFP examples
SPP: Fixed SPP cannot malloc slot bugs
SPP: Fixed SPP acceptor open with wrong remote address

Bluetooth Low Energy

Fixed bluedroid host report connection address error when remote device used RPA address
Added option to enable/disable ESP32 controller RPA
Fixed multi-connection pair failed
Added an option in menuconfig to configure maximum GATT services
Optimize multi-connection for ESP32-C3 and ESP32-S3
Fixed iPhone repaired failed for ESP32-C3 and ESP32-S3
Added reconnection function to try reconnect after the connection fails to be established
Added option to enable multi-connection
Updated connection state when getting connection cancel complete
Fixed BLE 5.0 pairing failed when using random address
Fixed reconnect failed when using rpa public address
Fixed BLE ANON_ADV address error
Fixed crash due to enable GATTC NVS cache
Fixed issue of option not being set due to incorrect macro name
Supported HID examples for ESP32-C3 and ESP32-S3
Fixed BLE can't resolve the peer address when whitelist is enabled for ESP32.
Fixed BLE connection will crash during erase flash
Fixed data length update failed
Fixed spelling mistakes
Modify ambiguous descriptions for BT_CTRL_BLE_MAX_ACT
Modify parameter description for esp_ble_gattc_open()
Added UHCI example to ESP32-C3, used for Bluetooth Controller only mode through HCI UART transport
Fixed Bluedroid Host auto update PPCP after exchange connection parameters
Added check if the BLE extend connection parameter is valid
Fixed the issue of the length of device name limitation
Added hci command to set coexistence status
Fixed assert failed when interrupt level disable
Fixed the address error in 5.0 extend advertising report event
Support low duty cycle directed advertising for ESP32-C3 and ESP32-S3
Fixed high duty cycle directed advertising will not be stopped when timeout
Fixed blufi encryption interrupted unexpectedly lead to unable encryption again
Fixed encryption procedure bug which causes insufficient security error in BLE host for ESP32-C3 and ESP32-S3.

NimBLE

Fixed WDT crash observed during security exchanges.
Fixed max connection configuration issue in ESP32-C3.
Updated custom logging support for NimBLE host.
Fixed ‘Impersonation in the Passkey Entry Protocol’ Vulnerability.
Fixed issue of crash during timer deletion
Check stack initialization status before executing stack commands
Added separate option to enable bonding which fixed forget device iOS issue
Removed critical log level value from menuconfig.
Blufi on Nimble: Added fix for crash issue on ESP32-C3 during application init.
Fixed wifi_prov_mgr crash after provisioning. Added fix to not check for stack status while registering listener
Added fix to handle 0 length ATT write request
Clear timer handle during de-initialization
Added BLE SPP service
Added BLE throughput demonstration example
Fixed Memory leak due to timer not destroyed during Nimble host start/stop

ESP-BLE-Mesh

Fixed using wrong endianness of input/output authentication number for Provisioner
Fixed provisioning input/output authentication number should be at least 1
Added check of Provisioning Random & Confirmation sent/received by Provisioner (CVE-2020-26556 & CVE-2020-26560).
Recommend to use OOB mechanism to exchange Public Key (CVE-2020-26559)
Recommend to use randomly generated AuthValue for Static OOB (CVE-2020-26557)
Make Unprovisioned Device Beacon interval configurable
Update the SIG recommendations for BLE Mesh CVE issues
Fixed filtering error when Provisioner receives heartbeat messages
Apply the errata E16350 of BLE Mesh from Bluetooth SIG

Wi-Fi & BT Coexistence

Coexistence: Fixed performance issue for extended active scan in coexistence scenario: use the same priority for Rx of AUX_ADV_IND and AUX_SCAN_RSP
Support external coexistence when WiFi starts, customers can use it for extending the other communication protocols to the mechanism of time diversion.
Fixed BLE scannable extended adv performance issue in case of Wi-Fi coexistence

Wi-Fi Mesh

Added support for chain topology ⁽¹⁾
mesh/ps: Added esp_mesh_ps_duty_signaling to accelerate the broadcast of new network duty. ⁽¹⁾
mesh/recv: Added option MESH_OPT_RECV_RATE (esp32-only). ⁽¹⁾
mesh/rssi: Average the router_rssi. ⁽¹⁾
mesh/ps: Close NWK-DUTY-MASTER process.⁽¹⁾
mesh/root: Change the condition of s_extra_scan_attempts ⁽¹⁾
mesh/ps: Remove ps duty info from the ADD announcement packets.⁽¹⁾
mesh/ps: Modify beacon interval to 300ms when ps is enabled. ⁽¹⁾
mesh/ps: Remove the support of MESH_PS_NETWORK_DUTY_APPLIED_UPLINK. ⁽¹⁾
mesh/c3: Fixed mesh deinit blocking issue ⁽¹⁾
mesh/c3: Fixed root has no eb for deauth frames during the networking ⁽¹⁾
mesh: Added esp_mesh_send_block_time to set blocking time of esp_mesh_send ⁽¹⁾
esp_mesh_send is blocked in nodes(layer>=3), when a FIXED-ROOT root is duty master ⁽¹⁾
Added non mesh connections access ⁽¹⁾
Fixed the issue that layer2 node connect to lower-layer node when FIXED-ROOT root disappeared
Fixed the device can not receive IP_EVENT_STA_GOT_IP when the router restarted

Wi-Fi

Fixed the issue that connect scan may cause crash ⁽¹⁾
Fixed potential crash or watchdog during FTM ⁽¹⁾
Fixed return type of esp_wifi_deinit when Wi-Fi is not stopped ⁽¹⁾
Fixed an issue that Wi-Fi stack may crash when receive AMSDU length bigger then 3200 ⁽¹⁾
Support disabling 11b rate ⁽¹⁾
Support configuring ESP-NOW rate ⁽¹⁾
Fixed miss-overwrite of some PHY registers when Wi-Fi modem sleep is enabled. ⁽¹⁾
Added encrypt option for ESPTouch v1 ⁽¹⁾
Fixed issue of reason code change from 15 to 200 when provided with wrong password ⁽¹⁾
Fixed the issue that the parameters obtained from RAM cannot be saved to NVS ⁽¹⁾
Modify not to store the default value in NVS⁽¹⁾
Fixed issue with hidden AP scans after connecting to an AP ⁽¹⁾
Fixed watchdog issue when receiving action frame ⁽¹⁾
Fixed issue of reason code change from 15 to 204 when provided with wrong password ⁽¹⁾
Fixed set_config return value error ⁽¹⁾
Fixed ampdu age timer memory leak ⁽¹⁾
Fixed the second distribution network failure of ESPTouch v2 ⁽¹⁾
Fixed ESPTouch v2 issues ⁽¹⁾
Support to sleep for station in disconnected status.⁽¹⁾
Support to adjust wake-up ratio for ESP-NOW at disconnected status. ⁽¹⁾
Keep wakeup state during csa ⁽¹⁾
Added beacon timeout event. ⁽¹⁾
Update TBTT when rx probe response after beacon timeout ⁽¹⁾
Current stays low at light sleep when using gpio to wake up. ⁽¹⁾
Updated libphy.a to V1800 20210413_e7ef680 for ESP32-S2 ⁽¹⁾
Prevent reinstallation of an already in-use group key ⁽¹⁾
Disable FTM by default for non-FTM examples to save space ⁽¹⁾
Update ESP32-C3 phy init data ⁽¹⁾
Cleaned GTK after disconnect ⁽¹⁾
Fixed error in setting channel after WiFi stop ⁽¹⁾
Updated ESP32-C3 Wi-Fi iperf default config. ⁽¹⁾
Fixed Block Ack setup issue in PMF scenario ⁽¹⁾
Validate FTM Initiator config parameters and propagate status ⁽¹⁾
Support phy calibration data save to nvs for ESP32-S2, ESP32-C3 & ESP32-S3 ⁽¹⁾
Fixed crash when csi is enabled⁽¹⁾
Fixed pm state error when csi cb function called ⁽¹⁾
Fixed amsdu and fragment vulnerabilities. ⁽¹⁾
Refactor WiFi ioctl function ⁽¹⁾
Compile WiFi library with -Os instead of -Og ⁽¹⁾
Added WPS strict config option ⁽¹⁾
Fixed aes_unwrap functionality ⁽¹⁾
Added ASAP mode support in FTM operations. In FTM Responder mode, added support for up to 3 FTM initiators simultaneously ⁽¹⁾
Move unused wifi log to noload section to save binary size ⁽¹⁾
Fixed RM capability missing for open mode AP⁽¹⁾
Fixed memory leak under 11KV macro ⁽¹⁾
Added support of regdomain database.⁽¹⁾
Fixed connection failure caused by sleep ⁽¹⁾
Fixed nvs init status issue. ⁽¹⁾
Fixed memory leak in esp_issue_scan error path ⁽¹⁾
Clear WLAN_FC_STYPE_ACTION bit in esp_register_action_frame ⁽¹⁾
esp_supplicant: Make esp_rrm_send_neighbor_rep_request return proper error ⁽¹⁾
wpa_supplicant: Trivial typo fix for setting spp_sup.require ⁽¹⁾
Fixed PMF issue with broadcast deauths with certain reason codes ⁽¹⁾
Fixed FTM not working in connected state issue ⁽¹⁾
Fixed airkiss and esptouch find channel crash issue⁽¹⁾
Fixed enterprise connection issue with windows radius server ⁽¹⁾
Fixed interoperability issue with Windows 2008 radius server. ⁽¹⁾
Added SHA384/SHA512 support for internal client. ⁽¹⁾
Support embedding multiple phy init data bin into app bin. ⁽¹⁾
Optimize Wi-Fi DTIM sleep current
Modified connect example to add scan mode config
PHY: Init phy data to default if invalid in flash partition to avoid bootloops
Fixed WiFi data rate status bug after disconnection.
Fixed WiFi tx bug in low data rate.
Support ESP32-S3 Beta3 Wi-Fi.
Added sniffer example FCSFAIL filter
Restructured wpa_supplicant's crypto code.
Added a new API to destroy default WiFi network interface created with esp_netif_create_default_wifi_...() API.
Added station based check for auth frame formation
WPA_Supplicant: Fixed supplicant debug logs errors.
PHY: Added esp_phy component and esp-phy-lib submodule
Fixed WAPI Key mgmt compatible issue
Fixed 9Mbps data rate Tx issue
Fixed 80211 tx crash issue
Support configuring 802.11 tx rate
Added support of wifi power save for ESP32-S3
Fix ESP32-S3 malloc rom funcs ptr in psram when psram enable.
Added missing cflag CONFIG_SHA256 for Makefile
Added support for MBO certification
wpa_supplicant: Fix wps_free_pins to remove all pins
Added GCMP, GCMP256, GMAC, GMAC256 support for ESP32C3/ESP32S3.
Added WPA3 192bit certification support.
Updated WiFi Enterprise example.
Fixed wifi and bt power domain leakage current in light sleep
Fixed Test PHY/RTC functions called when cache is disabled of ESP32
Fixed ESP32-C3/ESP32-S3 RSSI change with bandwidth issue
Removed scan done event for internal scans
Reset event bits in ftm example to avoid repeated failures
Updated Mexico operating channel as per FCC requirements
Fixed sniffer fcs error crash issue
Fixed static analysis warnings
Fixed fragment plt loss when 2td pn compare with 1th pn
PMF: allow keyindex in big endian format to workaround faulty APs
Updated miswritten and abbreviated words and syntax errors for initialize WiFi section in esp_wifi.h header file
Allow for minimal scope of wifi_init_config_t.
Fixed verbosity of supplicant logs
Fixed memory leak in WPA3 connection
Refactor key install code
Fixed miscellaneous FTM issues
Fixed not getting IP after DPP

Ethernet

Added support for KSZ8081 Ethernet PHY (#6578) ⁽¹⁾
Fixed wrong register bit order in KSZ8041 phy driver ⁽¹⁾
Fixed bug in w5500-mac which could corrupt memory or cause infinite looping while reading registers (#6579, #6233) ⁽¹⁾
Speed up Ethernet start up process ⁽¹⁾
Configure EMAC data interface before resetting PHY chip (#7227) ⁽¹⁾
Fixed eth2ap example crash issue ⁽¹⁾
Fixed esp_eth to only warn about negotiation timeout when link is up ⁽¹⁾
DM9051: Fixed potential missing Rx interrupts causing the Ethernet interface not responding (#6414) ⁽¹⁾
Added support for user-customized PHY IO functions
Updated link status logic to use esp_timer to check link status
Added support for KSZ8851SNL SPI Ethernet driver
Extended simple_sniffer example with option to sniff traffic on the Ethernet interface.
Changed RMII clock mode setting so it can be configured during run-time (#6564, #7107)
Added support for Microchip PHY LAN87xx family (LAN8710A, LAN8720A, LAN8740A, LAN8741A and LAN8742A).
Added support to use multiple Ethernet modules at a time
Updated ethernet/basic example to demonstrate usage of multiple Ethernet interfaces at a time
emac: Optimised iperf performance and reduced the rx task heap size
Added PHY loopback control via esp_eth_ioctl.
Fixed esp_eth_ioctl command's data argument non-standard handling
Fixed KSZ8851SNL to enable RX multicast in MAC filter
Increased LAN8720 ETH-PHY reset assertion time
Fixed missing loopback function assignment for KSZ8081
Fixed ESP32 EMAC driver insufficient TX buffer size issue after Ethernet stop/start sequence

Security

Digital Signature: Fixed invalidating Digital Signature key in HMAC peripheral if assertions are disabled ⁽¹⁾
secure_boot: Secure Boot V2 verify app signature on update ⁽¹⁾
secure_boot_v2: Supported SB_V2 for ESP32-C3 ECO3 ⁽¹⁾
Default supported ESP32-C3 Revision ECO3 ⁽¹⁾
Updated Memory protection component (memprot) API and tests for ESP32-C3 and ESP32-S2 ⁽¹⁾
Fixed potential physical access TOCTOU attack to remove encrypted partition flag in partition table (CVE-2021-27926) ⁽¹⁾
Secure Boot V2: Fixed compiler warning and possible ignoring of DRBG internal failure when verifying Secure Boot signature during OTA. This bug had no security impact. ⁽¹⁾
ESP32-C3/memprot: Fixed get_split_addr calculation and incorrect access to DRAM split address register ⁽¹⁾
Secure Boot V2: Confirm if the running app is signed by a valid non-revoked key before revocation ⁽¹⁾
Added support for encrypting binary with xts-aes 512-bit key⁽¹⁾
esp_hw_support/esp_ds: Fixed memory leak identified by cppcheck ⁽¹⁾
memprot: Fixed IRAM section alignment to avoid CPU prefetch overflowing to DRAM (causes PMS violation interrupt) ⁽¹⁾
Secure boot/ESP32 (ESP-S2, ESP32-C3): Disabled the ability to read protect efuses containing public key digest ⁽¹⁾
AES: Removed potential unaligned access to buffers in AES HAL/LL which could be a problem for certain cache mappings to external PSRAM on S2 and later chips. ⁽¹⁾
local_ctrl: Added support for protocom security1 and custom security ⁽¹⁾
AES/SHA: Fixed driver resetting the wrong DMA channel ⁽¹⁾
HMAC: Added Downstream JTAG enable mode for ESP32-C3 and ESP32-S3 ⁽¹⁾
Memprot: Fixed voltage glitching detection logic ⁽¹⁾
bootloader: Added a check of FE eFuse bit is on when an app is run
flash encryption in app: Added a check that app is run under correct FE configuration
Refactored code for secure boot (v1/v2) and flash encryption for better multi-target support
efuse: Added flash virtual mode to keep efuses after reboots. SB and FE can be run without permanent burns of efuses.
flash_encrypt: Added API to switch flash encryption "Development" to "Release"
esp_hw_support: added HMAC upstream functionality for ESP32-S3
Bootloader/ESP32-S3: Enabled secure boot V2 for ESP32-S3
ESP32-S2: Updated Memprot feature API - no logging and no aborts in case of failure, esp_err_t returned wherever reasonable instead. Error handling and possible logging done on caller's side
esp_hw_support: Added Digital Signature functionality for ESP32-S3
Fixed the Memprot feature check in esp_restart()
NVS: Added NVS partitions "encrypted" flag related v4.3 backward compatibility config
AES: Removed potential unaligned access to buffers in AES-GCM which could be a problem for certain cache mappings to external PSRAM on ESP32-S2
bootloader: Added fault injection protection for check_anti_rollback
AES/SHA: Fixed issue with descriptors and buffer potentially being placed in RTC ram
AES/SHA: Fixed cache writeback/invalidate not being applied for CONFIG_SPIRAM_USE_MEMMAP
secure_boot: Fixed warning when UART ROM DL mode is disabled.
bootloader: Added rng entropy activation and deactivation API
esp_hw_support: appropriate waiting time in esp_random() for ESP32-S3

Peripheral Drivers

freemodbus: Fixed incorrect reading of register outside of defined area descriptor (#6571)
freemodbus: Fixed rs485 rts de-assert fail when tx delayed (#6728)
freemodbus: Increase the maximum modbus tasks priority
I2S: Fixed driver uninstall can't disable the module
Touch_sensor: Fixed the touch measurement interval becomes longer after wake-up from sleep on ESP32-S2
I2C: Delete i2c cmd_mux semaphore more cleanly (#6848)
USB_SERIAL_JTAG: Fixed the bug that cannot write with usb_jtag
UART: Fixed a race condition and wrong interrupt flag setting
Timer Group: Reenable alarm interrupt only when auto reload is selected (#7001)
SPI Slave: Restrict MOSI/MISO enable on transaction preparation only for ESP32
SPI Slave: Fixed TX/RX maximum bit length HW register configuration for ESP32
SPI Slave: Remove Slave TX/RX set bitlen not effective for ESP32-S2/ESP32-C3
SPI Slave: Ensure DMA In-Link EOF is generated by trans_done on SPI Slave
SPI Flash: Added support for 32Mbit GD flash
TWAI: Fixed incorrect timing configuration initializers for the 1K, 5K and 10K bit rates.
SPI: Added support for keeping CS (chip select) active after a transaction.
UART: Fixed the garbage output when resetting the peripheral on ESP32-C3.
freemodbus: Added the FMB_PORT_TASK_AFFINITY kconfig option for modbus tasks (#6700)
freemodbus: Changed the default value of FMB_TIMER_PORT_ENABLED to disabled
SPI: Updated essl_spi driver to support synchronized data read/writes with a ESP SPI Slave working in append mode.
SPI: Added spi_slave_hd append mode example
SPI Flash: Added unlock function patch in bootloader to make GD flash more stable
MCPWM: Fixed wrong deadtime preset modes (#7321)
I2S: Fixed the wrong value of I2S_COMM_FORMAT_STAND_MSB.
UART: Ensure the driver object is in SRAM even PSRAM is malloc-able (#7044)
freemodbus: Fixed error handling in mbc_master_get(set)_parameter() for duplicate parameter key in parameter descriptor list (#7362)
freemodbus: Fixed compilation error when FMB_COMM_MODE_TCP_EN is disabled;
esp_timer: Added fix to reset timer group peripheral in timer_init() function (#6466)
freemodbus/examples: Fixed TCP master,slave examples reinitialization sequence
freemodbus: Fixed modbus TCP master,slave stack start - destroy issue
SPI Master: Fixed the crash when using interrupt mode when cache is disabled (#6529, #6781, #7368)
freemodbus: Fixed slave destroy bug when master and slave init simultaneously
Freemodbus: Fixed master and slave use the same timer group index (#4699)
GPIO: Fixed issue that gpio cannot hold during deep-sleep on ESP32-C3 (#7455)
Fixed all direct 8/16 bit-width access to peripherals on ESP32-S2, ESP32-S3, ESP32-H2, ESP32-C3
GPIO: Enable GPIO20 for ESP32-PICO-V3 chip package (#6918)
I2S: Fixed mono mode support, slave full-duplex mode and event queue bug, finish the refactor for I2S driver layer.
Use common check macro in drivers, that can be disabled to reduce binary size.
HAL: Add port layer for the log in the HAL.
ADC: Fixed adc2 single reading bug when working with WiFi
ADC: Added an ADC single read and calibration example for all chips
ADC: Fixed incorrect comments of ADC1_CHANNEL_8 and ADC1_CHANNEL_9 for ESP32-S2 (#6577)
async_memcpy: support copy memory from/to PSRAM by GDMA
freemodbus: Added MB_PORT_PARITY_GET() to propagate UART parity options from mb controller to serial port layer (#6377)
freemodbus: Fixed server task to exit gracefully to enable multiple restarts of a modbus client
freemodbus: fix PVS-Studio issues in modbus controller and mb stack
GDMA: Separate interrupt for TX and RX channel
GDMA: added gdma_set_transfer_ability to set channel transfer ability (e.g. alignment)
I2C: Added i2c_cmd_link_create_static() function to allow static allocation for I2C commands list
I2C: Added wrappers for simplifying writes, reads and write-reads
I2C: Added a way to select source clock in slave mode
I2C: Fixed i2c randomly timeout and triggers watchdog timeout on ESP32-C3
I2S: Fixed WS signal polarity in TDM mode
I2C, I2S: Remove invalid definitions in headers
LCD: Added esp_lcd component, support SPI/I2C/8080/RGB LCD panels
LCD: RGB LCD supports putting frame buffer in PSRAM
LCD: Support 8-line SPI LCD driver
LEDC: Support invert channel output
LEDC: Added ledc fade end callback feature
MCPWM: API changed: deprecated mcpwm_isr_register, added mcpwm_capture_enable_channel
MCPWM: ISR can be configured to place into IRAM with menuconfig now
MCPWM: Support MCPWM timer sync
MCPWM: Added check for the num_of_pulse argument of mcpwm_capture_enable function. (#5032)
MCPWM: Support configuring clock resolution for MCPWM group and timer
MCPWM: Added new function to get duty in microseconds: mcpwm_get_duty_in_us()
RMT: Support invert RMT signal by GPIO matrix
RMT: Support hardware implementation of automatically stopping output at end of loop: rmt_set_tx_loop_autostop()
SDMMC: sdmmc_host_pullup_en is deprecated in favor of SDMMC_SLOT_FLAG_INTERNAL_PULLUP flag in sdmmc_slot_config_t::flags.
SDMMC: Added provision for configuring SDMMC pins on ESP32-S3 via sdmmc_slot_config_t structure.
SDIO Slave: Fix ignored callback return value in sdio_ringbuf_send (#6768)
SDIO Slave: Allow getting end of frame information
SDIO Slave: Fixed the issue that interrupt may be cleared with finished trans unhandled
MSPI: Supported auto detect Octal Flash Vendor
SPI Flash: Support octal flash in esp_flash driver (currently only MXIC is supported).
SPI: Support 8-line (octal) spi master driver
SPI: Fixed SPI Master Fullduplex DMA mode single-direction-transaction bug
SPI: Fixed wrong target register for interrupt disable on ESP32-C3
SPI Flash: Fix esp_flash_erase_region function over-erasing when requested size is 0 (#7314, #7272).
SPI Flash: Added new feature to read the unique id for flash chips (#4255)
SPI Flash: Support override default chip driver list
SPI Flash: Increase the CS line setup used by the driver to make it more stable
Temperature Sensor: Now driver APIs will check to make sure the calling sequence is correct.
Timer Group, PCNT: Updated register and LL headers to latest version for ESP32-S2 and C3
Touch sensor: Fixed the issue measure times is set to wrong value during deep sleep on ESP32. (#6895)
TWAI: Added TWAI_ALERT_RX_DATA that alerts on successful reception of a message
UART: Fixed UART as a wakeup source bug on ESP32
UART: IOMUX is now used whenever possible when configuring pins, so that UART on IOMUX pins can be used for wakeup
UART: Added missing critical section wrappers around rx_buffered_len (#6396)
UART: Fixed a typo in the error message of invalid rx_thresh_xoff
USB: Fixed incorrect setting of D- pull down resistor
USB: Removed some non-existing registers from register structure
USB_SERIAL_JTAG: Added blocking driver for supporting VFS.
hal/ESP32-C3: Fixed SBA access from debugger in WIFI mode
ADC: Supported ADC DMA mode
GPIO: Fixed a typo on register struct that results in interrupt cannot be triggered on ESP32 core 1
GDMA: Support IRAM-Safe interrupt handler
MCPWM: Fixed implicit conversion in LL function (#8066)
Timer Group: Fixed the issue that timer group can't re-alarm if auto-reload is disabled (#8095)
USB: Added support for Communication Device Class (CDC) for USB host
USB: Added support for Mass Storage Class (MSC) for USB Host
USB_SERIAL_JTAG: Can print through USB_SER_JTAG port without changing the config option from UART
UART: Fix issue to free a registered custom ISR (#8150)
UART: Fix uart_enable_tx_intr can't disable the interrupt (fixes #8150)

Core System

Disable ESP32-S2 option "Allow .bss segment placed in external memory", this option is currently only supported on ESP32 ⁽¹⁾
Fixed delay between interrupt request and interrupt trigger ⁽¹⁾
VDD_SDIO power domain can now be configured to remain on during light sleep. ⁽¹⁾
SOC: Added dummy bytes to end of flash.text to prevent errors with CPU prefetching instructions past the end ⁽¹⁾
ULP: Fixed build system bug where linker script wasn't updated if memory reserved for ULP changed. ⁽¹⁾
Improve chip boot time for ESP32-S2 ⁽¹⁾
ULP: Fixed build system bug where linker script wasn't updated if memory reserved for ULP changed. ⁽¹⁾
Added option to enable Undefined Behavior Sanitizer (UBSAN)
Make longjump context switch-save ⁽¹⁾
Place xtensa_intr_asm into IRAM ⁽¹⁾
Remove core1 disable cache in cache_utils.c ⁽¹⁾
Reset Core0 after disable cache in esp_restart_noos() ⁽¹⁾
Fixed possible deadlock when using pthread_join() and log level set to Debug or higher ⁽¹⁾
Fixed potential failure to start in ESP32-S2 RISC-V ULP ⁽¹⁾
digital & rtc dbias of different chip may set to a different value according to pvt scan by ate; ⁽¹⁾
digital & rtc voltage mostly higher than before when cpu run 40M. ⁽¹⁾
Fixed the internal devices/registers access corruption due to concurrent read/write by a spinlock. ⁽¹⁾
Pthread thread-local destructor functions are now called with the ordering required by the specification (#6643) ⁽¹⁾
esp-timer: Helper function to identify the status of timer ⁽¹⁾
CXX: Fixed I2C master timeout
esp_event: Fixed and improved docs
Enable cache access error interrupt on ESP32-S3
Fixed regression of cache access error not getting detected for APP CPU core on ESP32
esp_system: Added sync of FRC & RTC counters in esp_restart ⁽¹⁾
efuse: Fixed len of SOFT_DIS_JTAG eFuse from 2 to 3 for ESP32-C3 and ESP32-H2 ⁽¹⁾
Fixed the sizes of .text and .rodata segments on ESP32-S2 ⁽¹⁾
partition_table: Fixed case when a few similar to otadata partitions are in the table ⁽¹⁾
Support .bss segment placed in spiram for ESP32-S2
Support NOINIT segment on SPIRAM (#4728)
Fixed auto adjust voltage bug on ESP32-C3 ⁽¹⁾
Move ETS_T1_WDT_INUM, ETS_CACHEERR_INUM and ETS_DPORT_INUM to l5 interrupt ⁽¹⁾
CXX: Added virtual destructor in I2C class ⁽¹⁾
rtc clock calibration: Fixed multi-calibration process protection logic ⁽¹⁾
ULP: Updated CONFIG_ULP_COPROC_RESERVE_MEM max value to reflect the max available memory ⁽¹⁾
Bootloader: Fixed bootloader considering a load end address invalid if it was at the end of a memory area ⁽¹⁾
Fixed possible issues with duplicate definitions of likely/unlikely macros (#6445)
Added Kconfig option to disable boot ROM log
esp_timer: Added a Kconfig option to set the interrupt level for esp_timer ISR
esp_timer: Added ESP_TIMER_ISR dispatch method
Fixed large number of "unused variable" warnings when asserts are disabled
Possible to build the firmware with no embedded file paths in the binary (#6306)
Added config item to select core affinity for main task under SMP (#6627)
esp_common: Added generic check macros
Fixed rtc watchdog reset when running multicore app on single core variant of target; abort instead
hHAL: re-structured duplicated HAL layer functions
ULP: updated the ld file for riscv ulp for ESP32-S2
Fixed a bug preventing user from putting panic handlers outside of the IRAM.
CXX: Fixed C++ exception stubs. No linkage of large unwinding code parts when building with -fno-exception anymore.
Added option to set maximum compile time log level higher than default (#5542)
Calling esp_log_level_set("*", level) now also changes the log output of ESP_DRAM_LOG and ESP_EARLY_LOG macros (#2285)
Added new startup_time example
spi_flash/encrypt: Fixed esp_flash_encrypted write (#6254) (#6322)
Pthread condition variable static initializer PTHREAD_COND_INITIALIZER is now supported
Fixed compilation of esp32/spiram.h from C++ code (#6658)
Added missing 64-bit stdatomic operations (#3163)
Added support for specify the maximum descriptor length when setting up the DMA descriptor link
log: Added Linux implementation of normal log functions
Added support describe structures of efuses in efuse_table
Added esp_log_level_get() function (#6573)
log: excluding log_linux.c correctly now
efuse: Burn operation does not block reading
esp_timer: esp_timer_get_next_alarm() will not return time for timers with skip_unhandled_events
Fixed bug where pthread_cond_timedwait() could return a timeout before abstime timestamp (#6901)
esp_system: Fixed wrong exception emergency pool allocation
heap: fix ESP32-C3 build issue with heap tracing enabled
Added new CMake function to help mocking whole components
RISCV-ULP: Added delay utility functions
RISCV-ULP: Added DS18B20 1wire example
esp_system: support backtrace on panic for RISC-V boards.
Memory layout is now part of heap component
Fixed redundant target include directories for ESP32 and ESP32-S2
CXX: Added VA_OPT(,) support for C++20
Updated esp_efuse_table.csv, added extended 2 bytes mac address and BOOT_DISABLE_FAST_WAKE for ESP32-H2.
Update the esp_efuse_table.csv, remove AUTO CONFIG DIG&RTC DBIAS
Added new choice of target ESP32-H2 in efuse_table_gen.py
Fixed the clock gating signal invalid of App cpu core in esp32s3 single-core mode
efuse: Added support custom MAC address stored in the eFuse for ESP32-C3, ESP32-S2, and ESP32-S3
esp_rom: added implementation for linux
esp_ipc: Added API for IPC to run small pieces of code on the other CPU
Console: Typo fix in cmd_nvs.c
Added support of auto light sleep for ESP32-S3
Fixed pm lock bug in dual core mode
esp_timer: added mocking of esp_timer
ROM: Added common API for tjpgd library in the esp_rom
Cache: Support 16KB DCache size for ESP32-S3
Cache: Register flash2spiram info to ROM for ESP32-S3
XTWDT: Added basic support for xtal32k watchdog timer for ESP32-S2/ESP32-S3/ESP32-C3
Fixed compiler warning with silent panic option
Watchdog Timers: Fixed literal overflow issue when calculating Task WDT timeout (#6648)
CXX: Fixes build error when including gpio_ll.h from cpp file
Xtensa: Changed the way assembly files jumps to functions located in another compilation unit
Pthread: reader-writer locks implementation
SOC: Moved peripheral linker scripts to soc component
SoC: Added reset reason header into soc component
usb_serial_jtag: Support using usb-serial-jtag as default console
heap: Fixed multi_heap_get_info_impl getting the wrong largest_free_block value (#7808)
RISC-V: Fixed usage of mcause within the interrupt handler
rtc clock calibration: Fixed bootup time increase when using usb-serial-jtag
efuse: Fixed a bug related to the non-sequential way of describing eFuses in efuse_table when such fields go together sequentially
heap: Fix a bug in the TLSF allocator returning a chunk of memory smaller than requested

FreeRTOS

Fixed race condition where it was possible for vTaskDelete() to delete a blocked task without the task being cleaned up ⁽¹⁾
Fixed uninitialized uxTaskNumber at task initialization ⁽¹⁾
Apply upstream patches for stack area alignment (#7274)
Upgraded to 10.4.3
Disabling asserts for the entire project (or setting silent) now applies to the FreeRTOS assert configuration
Changed default FREERTOS_IDLE_TASK_STACKSIZE value
Added Kconfig for task snapshot functions
Get snapshot related functions out of FreeRTOS implementation
Added mocking of task and queue
Fixed invalid taskEXIT_CRITICAL
Introduced configNUM_CORES to be used instead of portNUM_OF_PROCESSORS to align with upstream SMP implementation
Fixed prvTaskIsTaskSuspended() where a task pending ready can be mistaken as suspended
Added the hook functions vApplicationGetIdleTaskMemory() and vApplicationGetTimerTaskMemory() to provide memory for IDLE and Timer tasks when static allocation is enabled
Added Best Effort Round Scheduling. Replaces old behavior where tasks can be skipped indefinitely when time slicing. (#7256)
Added portTRY_ENTER_CRITICAL() to allow for timeouts when entering a critical section
Fixed thread safety issue with configASSERT
Fixed crash at startup when apptrace is enabled
Fixed xStreamBufferReset function always crashing
esp_ringbuf: Fixed a bug where comparision between a signed and unsigned operand resulted in incorrect free size for no-split/allow-split buffers (#7344)
esp_ringbuf: Fixed a bug where the Rx and Tx semaphore release sequence was incorrect in xRingbufferSend and xRingbufferSendFromISR functions.
Changed minimal stack size to regard watchpoint usage
Enabled xTaskAbortDelay() and xTaskGetHandle()

Build System

Modifying the linker script file triggers now a relink ⁽¹⁾
Prioritize project components over EXTRA_COMPONENT_DIRS⁽¹⁾
Fixed .flash.text alignment causing cache issue. ⁽¹⁾
Fixed overriding Python path with -DPYTHON when building IDF as CMake library (#6285) ⁽¹⁾
Improved error message if the Python dependency check completely fails to run due to an issue with the Python interpreter ⁽¹⁾
Any alignment is now permitted for .flash.rodata section as (custom) application version information is now in a separate section. ⁽¹⁾
Fixed CMake warning when compiling mbedtls component ⁽¹⁾
Fixed CMake build system to correctly pass the -Wwrite-string compiler flag if configured ⁽¹⁾
By default when using CMake, the FILE macro now replaces any IDF_PATH or project path with a placeholder relative path. This can be disabled in project config.
CMake: Added processing of dependencies for components passed in COMPONENT_DIRS or EXTRA_COMPONENT_DIRS when the component manager is enabled
Fixed CMake missing function error when limiting the component list to not include esptool_py (#6670)
Legacy Make Build System: Produce error if BUILD_DIR_BASE is a Windows-style path (#2736)
Legacy Make Build System: Fix menuconfig if BUILD_DIR_BASE is a relative path
Fixed redundant target include directories for ESP32 and ESP32-S2
Always compile with -fno-jump-tables -fno-tree-switch-conversion to avoid that code that needs to be placed in IRAM is optimized into jump tables which could get placed in flash.
Fixed common component requirements for Linux target
Added support for -msave-restore compiler option for RISC-V

Bootloader

Added config options to bypass app validation for minimum boot-time overhead ⁽¹⁾
Fixed bootloader_common_get_sha256_of_partition when RSA CHECK_SIGNATURE is on ⁽¹⁾
Improved XMC flash stabilities as main flash ⁽¹⁾
Enabled clock glitch detection ⁽¹⁾
bootloader: Silent assert option now applies when building bootloader
Second stage bootloader can now be overriden from a user application
Fixed psram cache issue work-arounds also being applied to the bootloader
User defined bootloader components which contain a Kconfig[.projbuild] file can now be configured through menuconfig, under Components config.
Fixed the issue that SPI Flash ROM functions are not correctly linked when CONFIG_SPI_FLASH_ROM_DRIVER_PATCH not enabled (#7508)
Fixed support for QIO & QOUT modes on ESP32-U4WDH chip and default configuration (#6191)
Fixed and re-enable bootloader_debug_buffer function for logging relevant Bootloader buffers

newlib libc

Implemented __sync atomic APIs and __atomic_exchange_n for architectures that don't have atomic instructions ⁽¹⁾
Added missing C++ header guards to <sys/dirent.h> ⁽¹⁾
Fixed flushing console output when CONFIG_VFS_SUPPORT_IO is disabled ⁽¹⁾
Added definition of MAXNAMLEN
Fixed missing atomic load/store operations when building with Clang (#7591).
Fixed missing atomic libcalls SYNC_LOCK_TEST_AND_SET & SYNC_LOCK_RELEASE for supported integer types. (#7592)
Fixed several missing includes and declarations, added extern "C" guards in uio.h
PSRAM: Changed the place where libc workaround can be stored. It can now be in flash or in IRAM.
newlib: Additional atomic builtins were implemented: __atomic_OP_fetch_n, __sync_OP_and_fetch_n, all nand related builtins (espressif/arduino-esp32#5948)
newlib: implemented sysconf, posix_memalign, realpath (#6119, #7798)

Tools

Deprecated unsupported old Pythons (<=3.5).
Prefer python3 during install and export (#6471)
Upgraded toolchains to esp-2021r2 version
Upgraded OpenOCD version to v0.11.0-esp32-20211220
Matching better annotated tags when determining ESP-IDF version
Added mypy pre-commit hook for type annotation checking
ESP-IDF Windows Offline installer - installation of ESP-IDF without need to access internet (https://github.com/espressif/idf-installer)
ESP-IDF Windows Online installer - installation of ESP-IDF using very small installer which downloads all required resources from internet (https://github.com/espressif/idf-installer)
Automatically determine ESP-IDF directory in install.fish (#6718)
ttfw: Fixed auto-detecting port hang forever issue
Remove dependency on idf-python and idf-python-wheels from tools.json. The dependency is handled by idf-installer for Windows. (#6881)
coredump: Added ESP32-C3 support
Support external Esptool wrappers by defining ESPTOOL_WRAPPER environment variable (#6879)
extend GDBStub component for handling GDB by serial port at runtime.
Console: Fixed a bug preventing REPL from being launched on another UART than default one (#6897)
Added timestamp printing for IDF Monitor (#7021)
Extracted coredump functionality from idf_monitor.py into the CoreDump class
Use Linux i386/AMD64 binaries on FreeBSD (#7226)
idf.py: Added subcommand "docs" for opening documentation in browser
Console: Improve linenoise implementation (#7254)
Console: Simplify console example
Update CMake version (3.16.4 -> 3.20.3)
Update CCache version (3.7 -> 4.3)
Docker: Use Ubuntu version 20.04
esptool/espefuse: Fixed execute_scripts, it should call BURN once at the end
"_" in idf.py commands are renamed to "-". Old subcommands are still supported with deprecation warnings.
Added xtensa-esp32-elf-clang to tools.json dependencies
export.sh return value fix
idf.py: Added Linux target support for idf.py flash and idf.py monitor
idf_size: Fixed bug with --archive_details that always runs like with --diff label
idf_size: Changed --archive_details output
Create the ".espressif" directory on the first run on clean system (#7848)
PowerShell export script: Initialize $envvars_array to an empty list (#7819)
PowerShell export script: Define $IsWindows if not defined (#7858 fixes #7820)
Avoid shell autocomplete initialization for bash version lower than 4
Check if the PIP_USER environment variable exists and if exists, set to value "no"
Fixed ldgen not allowing '+' sign in archive names (#8073)

Debugging

coredump: Fixed coredump header inclusion in C++ (#6585) ⁽¹⁾
coredump: Added support for RISC-V based boards. ⁽¹⁾
coredump: Fixed multiple bugs related to fake stacks and stacks in RTC DRAM (#6750, #6751) ⁽¹⁾
coredump: core dump check can now be parametrized in menuconfig ⁽¹⁾
coredump: Fixes EPC and EPS register values printed by espcoredump.py ⁽¹⁾
coredump: esp_core_dump_image_get() is now available again when core dump is not activated in menuconfig ⁽¹⁾
coredump: Added esp_core_dump_image_erase function (#6631)
coredump: Get core dump summary API. Added on device core dump parsing support for ELF file.
coredump: Fixed a bug in esp_core_dump_image_erase when flash encryption is enabled. (#6949)
coredump: Added support for the ESP32-S3
apptrace: ESP32-C3 support
apptrace: Refactored apptrace for better support of various tracing HW
Gcov: Fixed ESP32 gcov dump issue
Gcov: Added ESP32-S2 support

Power Management

Disable brownout detector before entering deep sleep on ESP32-S2 (#6179) ⁽¹⁾
Provide an interface to get pm_configuration ⁽¹⁾
Fixed deep sleep issue caused by the mixed use of deep sleep and light sleep ⁽¹⁾
Fixed ESP32-S2 will not be awoken when deep-sleep time is set to 0 ⁽¹⁾
Fixed the xtensa series soc SysTick frequency error when dfs is enabled ⁽¹⁾
Added support of RTC8M (Internal 8MHz OSC) power domain ⁽¹⁾
Added support of XTAL (External 40MHz XTAL) power domain ⁽¹⁾
Fixed SPIRAM leakage current when its CS pin has no hardware pullup ⁽¹⁾
Fixed Flash leakage current when its CS pin has no hardware pullup ⁽¹⁾
Light sleep: Fixed timer offset issue with ESP32-S2 light sleep first wakeup
Support ESP32-S3 GPIO sleep isolate function
Support RTC module for ESP32-S3
Support ESP32-S3 normal light sleep
Fixed rtc register read error (RTC_XTAL_FREQ_REG invalid value)
Added support of cpu retention for ESP32-S3
Added support of i/d-cache tagmem retention for ESP32-S3
Support ESP32-S3 deep sleep mode
Fixed WiFi/BT MAC BB power down in light sleep
Fixed the issue of deep sleep wakeup failure caused by using light sleep and deep sleep at the same time
Fixed driver using wrong print function in a critical section (#7942)

LWIP

esp_netif: Added config option CONFIG_LWIP_SLIP_SUPPORT to disable SLIP interface. ⁽¹⁾
Fixed LWIP_DEBUG define to include debug logs only if enabled. ⁽¹⁾
Fixed a thread safe issue which leads to assert in LWIP ⁽¹⁾
Fixed DNS server index to overflow to DNS_MAX_SERVERS causing LWIP_ASSERT (to enable local queries when no DNS server is set, #6878) ⁽¹⁾
esp_netif: Fixed failing ppp_set_auth() due to wrong argument check (#7047) ⁽¹⁾
Added CONFIG_LWIP_ICMP to option ICMP. ⁽¹⁾
Added CONFIG_LWIP_DHCPS to enable/disable DHCP server. ⁽¹⁾
esp_netif: Fixed state transition of DHCP server if it's stopped before setting the interface up ⁽¹⁾
Fixed esp_ping_new_session may return ESP_OK when the error occurred ⁽¹⁾
Fixed ICMP ping on a specific network interface (#7397) ⁽¹⁾
dhcpserver: Added extern "C" directive in dhcpserver head file. ⁽¹⁾
Added support for IPv4 only configuration (LWIP_IPV6 macro to strip IPv6 functionality)
Added support for silent assert option.
Added NETIF_API config option to enable standard posix netif API, such as if_indextoname()
Added PPP config option to set LCP echo options (#5119)
Added config option LWIP_IPV6_NUM_ADDRESSES for number of IPv6 addresses on each interface.
Added config option LWIP_IPV6_FORWARD for IPv6 packet forwarding.
Added config option LWIP_NETIF_STATUS_CALLBACK for network interface status callback.
Added config option LWIP_HOOK_ND6_GET_GW for hooking the IPv6 gateway decistion logic.
Added default declaration and weak implementation for the new IPv6 gateway hook.
Added IP_EVENT_ETH_LOST_IP event.
Added configuration to disable DHCP client identification
PPP: Fixed disable IPv6 will make esp_netif_lwip_ppp build fail.
Added ND6 RDNSS DNS server Kconfig option.
Fixed DHCP Server to remove clients record if request not acked (#6410)
Added new options to set maximum number of SNTP servers and optionally receiving them via DHCP (#7336)
esp_netif: Fixed incorrect setting of SLIP interface default routing priorities (#7246)
Added support for LWIP_TCPIP_CORE_LOCKING config option.
Added minimal vfs implementation of fstat() which sets the st_mode to socket type (#7198)
Added support for DHCPv6 stateless address configuration
esp_netif: Extended PPP netif API to control connection failure
Added support for DHCP option length configuration
Added functionality to deinit lwip timers
Added configuration for DHCP vendor class identifier option
Updated LWIP_DHCP_OPTIONS_LEN default value when LWIP_DHCP_DISABLE_VENDOR_CLASS_ID disabled

mDNS

Added MDNS_STRICT_MODE config option to work with strict resolvers ⁽¹⁾
Fixed non-strict mdns query resolution if instance/hostname wasn't set ⁽¹⁾
Fixed IP header TTL to meet the mdns spec ⁽¹⁾
Fixed crash when wifi interface get deleted and mdns continues to receives the packets ⁽¹⁾
Fixed reported error found during static analysis
Updated APIs description and added a warning when hostname contains '.local' at the end of query (#6590)
Added mdns_delegate_hostname_add mdns_delegate_hostname_remove and mdns_hostname_exists for managing the delegated hosts.
Added a mdns_service_*_for_host variant for all service publish and management apis.
Added mdns_service_exists for querying whether a service has been published.
Added support for explicitly specifying txt value data length for the published services
Added support for extracting the txt value data length from mdns answers
Added support for simple mDNS responders (#7124)
Added asynchronous query API
Added more attributes to mdns_result_t: service_type, proto and ttl.
Added optional networking layer on BSD socket.
Added option MDNS_MULTIPLE_INSTANCE which allows mdns_service_add to add multiple instances with same service type.
Added mdns_service_exists_with_instance to check service existence with certain instance name.
Fixed parsing queries containing non-standard domains.

protocomm

Fixed Out-of-bounds read in protocomm_console.c

OTA

otatool: Fixed read_ota_partition cmd, required output arg (#6559) ⁽¹⁾
otatool: Fixed a crash when imported as external python lib ⁽¹⁾
otatool: Fixed incorrect using otadata.seq&crc in switch_ota_partition cmd ⁽¹⁾
esp_https_ota: Added support for partial image download over HTTP/1.1
esp_https_ota: Added support to send post request if body is set
esp_https_ota: Enabled option of using global_ca_store and x509_crt_bundle
advanced_https_ota: Added NimBLE and bluedroid GATT Server support and related CI changes for testing.
Added esp_https_ota_get_image_size() to retrieve total size of OTA update
app_update: Added API to get partition count in esp_ota_ops.h
Fixed app crash when running OTA and OTA related task's stack is in rtc fast memory at the same time

HTTP Client

Fixed header truncated when responded header length over buffer_size (#6370) ⁽¹⁾
Fixed esp_http_client_read with OpenSSL server for file size aligned to 289 bytes ⁽¹⁾
Fixed memory leak identified by cppcheck ⁽¹⁾
Added support of client_key_password for HTTPS connection ⁽¹⁾
Fixed wrong handling of an EAGAIN case.⁽¹⁾
Added cert and key length options in esp_http_client_config_t (#6556)
Added config option for HTTP digest authentication
HTTP method must be explicitly set in case of chunked encoding, earlier it was set to POST by default (#6234)
Added support to enable crt_bundle for an https connection.
Fixed https_async demo by adding appropriate server verification option.
Fixed case sensitivity in comparison of auth string
Added API to set http client timeout value.
Fix when receive FIN, close the connection in internal.
Support HTTP_EVENT_ERROR event under multiple failure scenarios
Fixed disable CONFIG_ESP_HTTP_CLIENT_ENABLE_HTTPS will build error
Fixed HEAD request will affect the all next HTTP requests unless we close the HTTP request
Add an interface that can get session errno so that it can be processed according to requirements in the user layer

HTTP Server

Fixed ws server handle length over 1440(MTU) messages incorrectly. ⁽¹⁾
Support dynamic payload len for ws server (#6433)
HTTPD: Updated httpd_get_client_list function and its documentation.
HTTPD: Added support for calling uri handler when websocket connection is established.
Redesigned httpd_sess_* function to speed up the server (#6313)
Support user_ctx in websocket handler callback request.
Fixed infinite loop on closed socket
Added helper APIs to get cookie value in request. (#7273)
Added convenient websocket send functions

Provisioning

Fixed wifi warning in wifi_prov_mgr application ⁽¹⁾
wifi_provisioning: Added API to erase credentials and reset provisioning state ⁽¹⁾
Provisioning BLE: Added API support to set manufacturer data in advertisement packets.⁽¹⁾
Added an API for resetting provisioning status
Updated README.md to explain QR code format (#6629)
WiFi credentials were not saved to NVS if esp_wifi_set_config() was called by some other module after wifi_prov_mgr_start_provisioning()
BLE Provisioning: Added secure connection pairing support to unified provisioning framework.
Change default PoP argument of esp_prov.get_security from None to string (#7130)

mbedTLS

Added CONFIG_MBEDTLS_ROM_MD to enable ROM MD acceleration. ⁽¹⁾
Fixed mbedtls_ssl_send_alert_message crash due to ssl->out_iv is NULL. ⁽¹⁾
Added support for external memory policy for ESP32-S2 ⁽¹⁾
Added config option for key elements and key element extension for SSL connection
Provision for GM/T SSL 1.1 support under config option.
Fixed build fail with client only mbedtls
esp_crt_bundle: Updated the cacrt_all.pem file
Fixed issue where hardware MPI was not being used in some cases for ESP32-C3
Decrease SSL peak heap cost by around 30% in dynamic buffer configuration feature
Upgrade to latest bugfix release v2.16.12
Disable MBEDTLS_DYNAMIC_BUFFER feature when MBEDTLS_SSL_PROTO_DTLS is selected

ESP-TLS

Prevent freeing of global ca_store when mbedtls dynamic cert free is enabled. ⁽¹⁾
secure_element: Updated esp-cryptoauthlib submodule to cryptoauthlib-v3.3.1. ⁽¹⁾
Fixed esp_mbedtls_write API when 0 bytes are written. ⁽¹⁾
Fixed potential issue in wolfSSL wrapper that esp_tls_read/write() returning positive code on error
Improved error messages when using debug mode
esp-tls: Enable DS peripheral support on ESP32S3 target
Added session ticket support for server/client using mbedtls
esp_tls_crypto: Fixed esp_crypto_base64_encode for wolfSSL stack

Websocket

Added Support to bind socket to specified interface function

ESP-MQTT

Added config option to configure custom retransmission interval ⁽¹⁾
Fixed build issue if certificate bundle or websocket transport disabled ⁽¹⁾
Fixed to support zero length username if password is set without username (espressif/esp-mqtt#183)
Added support for ESP x509 Certificate Bundle.
Added NULL pointer checks for public APIs.
Added experimental C++ client implementation.

TCP Transport

Move code under relevant config option to save some flash footprint. ⁽¹⁾
Added configuration option CONFI_WS_TRANSPORT to disable Websocket transport if not used. ⁽¹⁾
Added TCP transport common connection errors (espressif/esp-mqtt#182)
Used common TCP transport from esp-tls to reduce code duplication.
Added Support to bind socket to specified interface function.
Added API to enable crt_bundle for SSL connection.

Storage

vfs: Fix build errors in esp_vfs.h when included in C++ files with target ESP32-C3 ⁽¹⁾
vfs/uart: Fixed memory leak identified by cppcheck⁽¹⁾
vfs: Added esp_vfs_unregister_with_id and esp_vfs_register_fd_with_local_fd for better control over registered vfs and fds.
vfs: Added eventfd in vfs component.
vfs: Added an example to pass events from tasks and interrupt handlers with eventfd.
vfs: Fixed possible wrong select return value when file descriptor is closed
vfs: timeout of select function is now POSIX compliant.
Partition Table: The partition table MD5 checksum is now checked when the partition table is loaded by the app, in addition to the existing check in the bootloader. ⁽¹⁾
Partition tables: Added ESP_PARTITION_TYPE_ANY for iterating over all partition types (#6586)
Partition tables: Build system produces a warning if a data partition is not aligned to 4 kB (#7295, #7350). This will become an error in the future release.
SPIFFS: add spiffsgen.py options for ESP8266 compatibility: --aligned-obj-ix-tables, --no-magic-len, --no-magic
SPIFFS: reduce spiffsgen.py execution time for large filesystems.
NVS: Fix public API parameter checks, init checks, fix documentation
NVS: fixed crashes from entries with state 1
FatFS: Updated FatFS API - added implementation of disk_status() callback

External Libraries

expat: Update library from 2.2.9 to 2.4.1. ⁽¹⁾
cJSON: Updated cJSON submodule to v1.7.15 ⁽¹⁾
coap: Fixed few missing NULL checks in coap_mbedtls.c
coap: Update libcoap version to v4.3.0
coap: Added multicast support for coap_server/coap_client
coap: Update libcoap logging to use esp-idf logging
libsodium: Updated third party libsodium library to 1.0.18
tinycbor: update to latest upstream master (as of April 19th 2021)

Examples

Fixed enable CONFIG_EXAMPLE_RESET_PROVISIONED will cause device crash ⁽¹⁾
Added QR code support for provisioning examples ⁽¹⁾
Added sdkconfig.deafults.esp32c3 for BLE Mesh Aligenie example ⁽¹⁾
pppos_client: Fixed SMS sending before switching to data mode ⁽¹⁾
Fixed compilation of protocols examples with CONFIG_EXAMPLE_USE_OPENETH=y ⁽¹⁾
Updated certificates of https examples ⁽¹⁾
Added sdkconfig.defaults.esp32s3 for ESP-BLE-Mesh examples ⁽¹⁾
SPI: Added an example for spi slave hd segment mode⁽¹⁾
Added basic authenticated example to HTTP server (#5646)
MQTT: Updated MQTT public test broker service url
SPI Flash Fatfs: Fixed ext flash fatfs cannot connect to external flash issue
PPPoS client: Fixed power_down command for SIM7600
Added Touch Element library examples
Identify the callback whether is hanshake or frame-receive by req->method
README files updated on wifi, peripherals and system
pppos_client: Added options to support LCP ECHO and UART_ISR_RAM in the example
Added static IP example with ability to setup DNS info
Added OpenSSL example tests (server/client)
Added non blocking sockets examples(tcp client/server)
coap_client_example: Updated the target domain URL
Fixed stability of ENC28J60 Ethernet driver Example.
Added ENC28J60 to iPerf Example.
simple_sniffer was moved from /wifi folder to /network folder
network_tests was moved from /system to /network folder
Bluetooth: Fixed the use of deprecated sdkconfig options in the example and rename the example
HTTP Server: Added Captive Portal Example
Added support of ESP32-S3 chip in controller_hci_uart example
Updated ASIO chat server/client test to use loopback
HTTP Server: Added Captive Portal Example
ESP32S3 support for ESP-MQTT SSL Mutual Authentication with Digital Signature
Added esp_modem example demonstrating simple CMUX PPPoS client
Fixed overflow condition in iPerf's average bandwidth computation formula
Added support of ESP32-S3 chip in Ethernet related examples
README files updated for http examples
Fixed linux host example
pppos_client: Fixed potential data race condition using only UART data event for pattern detection (#7176)
Replaced hyphens with underscore in get-started directory
HTTPS Server: Added user callback utility
pppos_client: Fixed modem netif deinit to clear IP events (#6787)
freemodbus: Added examples of API usage
GPIO: Fixed the issue that config struct is not properly initialized
I2C: Added simplified example showing reading/writing to I2C sensor.
I2S: Added ES8311 example and unit-test for I2S
I2S: Added missing mck pin configuration in the example
I2S: Added I2S digital MEMS PDM microphone example.
MCPWM: new example: HC-SR04 sonar sensor
MCPWM: Cleaned up BLDC Hall sensor example
MCPWM: Added an mcpwm example of PID motor control
MCPWM: Removed basic config example
PCNT: Install PCNT interrupt for only once in the rotary encoder example. (#6889)
RMT: New example: A4988 based step motor controller
SDSPI: Uses SDSPI with Auto DMA channel in sd_card example
SPI: Use Auto DMA channel for all SPI examples.
Timer Group: Using interrupt callback in timer group's example
LEDC: Added support for addressable LED in the blink example
LEDC: Added LEDC basic PWM example.
LCD/LVGL: Added LVGL porting example
wave_gen: Remove the ESP_INTR_FLAG_IRAM flag when register the ISR
Readme file updated on the examples/get-started/blink
README files added for the Bluetooth Bluedroid BLE50 examples
Walkthrough tutorial files added for the Bluetooth Bluedroid BLE50 examples
Simple sniffer example bug fixes
ADC: Added an ADC DMA example
SPI SLAVE HD: Fixed stack variable bug in seg_slave example (#7163)

Documentation

Updated NVS documentation (#6123)
Added ESP32-C3-DevKitC-02 User Guide
Corrected UART default pin names and provided more information about ESP-Prog board
Provided a new example demonstrating building an application with multiple configurations
Added Linux host test documentation
Expanded documentation for POSIX Threads (pthread) support
Removed ROM console
Updated adc_types.h
Updated the command used in app_trace.
Added RF calibration docs for ESP32-S2 and ESP32-C3
Added ESP32-DevKitC, ESP32-S2-Saola-1 and ESP32-C3-DevKitM-1 boards pin layout images
Added the USB pins description on ESP32-C3-DevKitM-1 header block table.
Provided new rules for formatting documents.
Removed contents under 'Modules and Boards' as well as 'Previous Versions of Modules and Boards'
Added Performance Guide
Added a Flowchart about Debugging OTA Failure
Updated the hyperlink in readme. (#7170)
Renamed ESP-MESH to ESP-WIFI-MESH
Restored flash encryption section about manually encrypting files on the host (with a copy of the same key stored in eFuse)
Fixed all wrong AP event names
Provided requirement to keep the line number for EN and CN document consistent.
Added ESP32-S2-DevKitC-1 user guide
Added pin reference list for chip ESP32, ESP32-S2, ESP32-C3 and ESP32-S3
Added new libraries and frameworks
Added chip support matrix to the main README
Build docs related files have been moved to esp-docs repository
Updated the TOC of ESP-IDF API Reference to make it consistent with the real section title
Replaced ESP32-WROVER-B with ESP32-WROVER-E in ESP-WROVER-Kit user guide
Added a new module variant: ESP32-WROOM-DA for ESP32-DevKitC V4.1 board
Added pin layout diagram and header block description to ESP32-S2-Saola-1 User Guide
Added pin layout diagram and updated external antenna connector name in ESP32-S2-DevKitM-1 User Guide
Updated flash encryption docs with 512 bit key related information
Fixed OpenOCD configuration files names for ESP32-S3
Provided missing information about OT joiner configuration
Added documentation for 802.11k and 802.11v APIs
Corrected Linux host test requirements
Fixed esp_ota_revoke_secure_boot_public_key API documentation not appearing in the appropriate docs
Made Classic BT Documents only visible for ESP32
Updated mocking documentation
Updated Chinese translation of numerous files of the Programming Guide, updated corresponding English version of the files to get them in sync
Documented KEEP, ALIGN, SORT flags and surrounding symbol for linker script rules
Storage: Updated SD card example (split in 2 new examples for both SDMMC and SDSPI)
ADC: Updated ADC calibration programming guide on ESP32-C3
freemodbus: Update modbus documentation + description of types
MSPI: Added a programming guide about configuring Flash and PSRAM on ESP32-S3
SPI: Fixed the default maximum transaction length.
SDMMC host: Updated the description of eMMC speed and line modes.
Timer: fix uninterpreted variables in timer.rst
Timer: Updated the number of general purpose timers for ESP32-C3.
Timer: Provided APB clock frequency information in api-reference/timers.rst and in timers.h
Timer: Clarified that the for esp32 timer, only one clock source (APB_CLK) is available.
UART: Fix adopted typo in overview section of UART documentation (#6327)
LEDC: Adjusted ESP32-C3 documentation
Module on ESP32-DevkitC has been updated from ESP32-WROVER to ESP32-WROOM
pthread: Updated documentation about reader-writer-lock implementation
Updated misc docs with ESP32-S3 specific information. Any docs which are not yet updated for ESP32-S3 contain a warning.

espressif/esp-idf v4.4-rc1 ESP-IDF Pre-release v4.4-rc1 on GitHub

Obtaining v4.4-rc1

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Download an archive with submodules included

Changelog

Major New Features

Breaking Changes

Known Issues in v4.4-rc1

IEEE 802.15.4

OpenThread

Bluetooth Controller

Bluetooth Low Energy

Classic Bluetooth

Bluedroid

Classic Bluetooth

Bluetooth Low Energy

NimBLE

ESP-BLE-Mesh

Wi-Fi & BT Coexistence

Wi-Fi Mesh

Wi-Fi

Ethernet

Security

Peripheral Drivers

Core System

FreeRTOS

Build System

Bootloader

newlib libc

Tools

Debugging

Power Management

LWIP

mDNS

protocomm

OTA

HTTP Client

HTTP Server

Provisioning

mbedTLS

ESP-TLS

Websocket

ESP-MQTT

TCP Transport

Storage

External Libraries

Examples

Documentation

espressif/esp-idf v4.4-rc1
ESP-IDF Pre-release v4.4-rc1

on GitHub