ESP8266_RTOS_SDK Release v3.2

This is the list of changes since release v3.1.

1. Important Notes

Provide 4KB more heap for user since v3.2.
- Test Environment: ESP8266 runs as a station, connects to an AP and gets an IP address from the AP.
- Test Result:
  - After the chip got IP, the system's free heap size of v3.2 is 76716 Bytes;
  - After the chip got IP, the system's free heap size of the latest release/v3.1 is 72812 Bytes.
- Conclusion: 4KB more heap is available for user with the v3.2.
V3.2 reduced the application binary size. For example, when compiling the example "openssl _demo", the generated app bin size is about 30KB less than the V3.1.
V3.2 removed the use limitation when using sniffer/promiscuous mode and operating the flash together.
If you need to call the esp_wifi_set_protocol, it should be called in the SYSTEM_EVENT_STA_START event.
For better compatibility, the ESP8266 is in bg mode by default. And application can set it to be bgn mode for reconnecting when it fails to connect some special APs, refer to the example "simple_wifi".

2. Changes in Functions and Features:

2.1 APP Update

Fix an issue that the base address of OTA copy cache buffer may not be aligned by 4 bytes.
Fix an issue of upgrading from old SDK to the new IDF style SDK, which caused by incorrect flash map.
Add combine binary overwrite checking.
Add a feature to check OTA firmware's entry function link address in case mistakenly download a wrong firmware.
Add a feature to copy old RF parameters to new SDK partition for that users' RF parameters are customized.
Add a feature to generate OTA initial binary.
Add a feature to get the target AP's SSID and password saved by the old SDK. So users can make the system connects to the same AP even if upgrading from an old SDK to the new style SDK.
Add a feature to check the wrong partition table.
Spilt OTA example into sub-examples to adapt to various use scenarios.

2.2 AWS IoT

AWS-IoT using esp-tls instead of mbedTLS, and this change makes it able to use wolfSSL.
Update to latest AWS certificate.

2.3 Bootloader

Add a feature that bootloader will copy app firmware from OTA_1 partition to OTA_0 partition after finishing FOTA. In this case, users can generate only one app firmware (OTA_0), instead of two firmwares (both OTA_0 and OTA_1), when using ESP8285 (or ESP8266 + 1MB Flash).

2.4 Build System

Fix print_flash_cmd print information error.
Optimize compiling script to get partition information from partition table binary.
Porting from esp-idf to support cmake
Update cmake project configuration file of components and examples to support cmake

2.5 CJSON

Add a feature to check if 32-bit type data overflowed when using newlib in nano mode.

2.6 Console

Add console component and example

2.7 Driver

Fix PWM error phase
Fix the blockage issue when UART enables swap
Fix a bug that PWM may be interrupted by Wi-Fi
Fix PWM jitter when connecting AP
Fix PWM channel number type error
Fix SPI example readme wave image error
Modify UART tx done API to add ticks for waitting
Add ADC driver and example
Add I2S driver and example
Add SPI RAM driver
Optimizing HSPI example

2.8 ESPOS

Remove ESPOS component

2.9 ESP-TLS

Update from esp-idf
Fix an issue of receiving fail when working in non-block mode

2.10 Esptool

Add a feature to disable the main part of rom UART0 printing
Add a feature to make software reset after finishing downloading

2.11 Factory-test

Add factory test example and document

2.12 FreeRTOS

Divide ringbuf to be an independent component from freertos
Remove unnecessary stack panic information so that only useful stack data will be print
Remove unused or unsupported platform code from freertos, only left the useful part for the xtensa LX106
Add a configuration to link some functions to IRAM to speed up task switch
Add an option to enable queue sets
Add an option to disable some functions to optimize firmware bin size
Add an option to disable FreeRTOS if user wants to use other OS instead
Add an option to enable facility
Add a function to get CPU usage
Add an option for idle task stack size, changed the default size from 768 to 1024 bytes
Add CPU wait in idle task to save power
Add an option for panic so that users can select whether it outputs panic information or not
Add independent tick/idle hook functionality

2.13 HEAP

Modify heap raw malloc/free link from flash to iram, to remove sniffer/promiscuous mode use limitation

2.14 HTTP Client

Add esp_http_client component from esp-idf
Add wolfssl platform support for http client

2.15 HTTP Parser

Add http parser from esp-idf

2.16 HTTP Server

Add the esp_http_server component from esp-idf

2.17 HTTPS OTA

Add esp_https_ota component from esp-idf

2.18 Log

Fix log time stamp error

2.19 LwIP

Fix compiling error when disable "set socket SO_LINGER default"
Fix a bug that socket multi-thread does not check socket offset when using VFS
Fix UDP sync register message error when using raw socket
Fix a crash issue when multi threads reenter lwip_close
Modify netif hostname according to rfc952
Add "<time.h>" declare to "lwipopts.h"
Add "<sys/select.h>" header file
Add a function to increase TCP sending speed at non-blocking mode
Add standard "fcntl" and "ioctl" APIs for application if VFS is disabled
Add a reserved DNS server to avoid DHCP changing all DNS server addresses
Add Auto-IP triggers callback so that application can know IP changes when running mDNS
Clean up LwIP port source code
Enable LWIP loopback by default in the example http_server series and wifi-provisioning

2.20 MQTT

Add esp-mqtt component and example
Fix compiling error when disable WS or WSS

2.21 NVS Flash

Added nvs_partition_gen_utility.py

2.22 Partition table

Fix partition load redefined error

2.23 Protobuf-c

Add protobuf-C component

2.24 Protocomm

Add protocomm component

2.25 SPIFFS

Add SPIFFS component and example

2.26 SSL

remove AX-TLS
Add license note to README and header file of wolfSSL
Modify network wrapper from mbedtls to esp-tls
Modify network wrapper from wolfSSL to esp-tls

2.27 System

Fix %p format print error of ets_printf
Fix a bug that startup function cannot support multiple segments
Fix a bug that RTC segment is always loaded even if it is woke up from deep sleep
Fix compiling error that "esp_sleep.h" leaks "gpio.h" declaring
Modify macro name of platform from TARGET_PLATFORM_ESP8266 to IDF_TARGET_ESP8266
Add interrupt overhead time test
Add an option to configure CPU frequency to be 160MHz before app_main
Add an API esp_timer_get_time to get microsecond
Add a function to print version of "phy" library
Add error number description
Add a feature that software disables UART swap before restart
Add an option to init OS before starting for "RTT"
Refactor link section to make unused function/data not linked
Refactor GPIO wakeup API in force sleep mode
Remove esp_socket to save RAM and ROM
Update libphy.a to 1055_22
- Optimize time waking from light sleep to reduce power consumption
- Disable calculating No.14 channel when power on

2.28 TCP Transport

Add tcp_transport component

2.29 TCPIP-Adapter

Fix a memory leak issue that received pbuf may not be freed

2.30 Util

Add a function to speed up loading data from instruction bus
Add new SHA(1/256/512) algorithm and unit test
Add new AES(ECB/CBC/CFB128/CFB8/CTR) algorithm and unit test
Add util_assert to check input parameters
Refactor CRC to speed up loading data from lookup table, which is laying out at instruction bus

2.31 Virtual File System

Add VFS component
Disable VFS components by default

2.32 Wi-Fi

Remove WME information by default
Refactor the method that sync data from Wi-Fi driver to 802.11 stack task, to reduce the time of close NMI which may cause Wi-Fi status wrong
Fix a crash issue when receiving a wrong beacon whose DTIM is 0
Fix a crash issue when Wi-Fi tx state error
Fix transmitting error when "RTS", "CTS", "transmiting start" and "transmiting complete" events are triggered in the same time
Fix a bug that Wi-Fi may fail to enter force sleep mode when pm is enabled
Fix PWM error at sniffer mode
Fix a bug that queue sends data in blocking mode when locking the scheduler
Fix a bug that esf_buf did not set critical state
Fix a bug that station does not use random SEQ to associate AP
Fix a memory leak issue when scanning in sta+softap mode with some special AP
Fix description of phy power level
Fix description of some members of wifi_pkt_rx_ctrl_t in esp_wifi_types.h
Modify smartconfig type to sc_callbac
Modify ESP8266 Wi-Fi API to keep consistent with ESP32
Using global functions instead of function table to reduce unused function
Add esp-log to internal library
Add a configuration to set Wi-Fi TX power
Add a feature that Wi-Fi sends deauth to ap before connecting
Add sniffer example
Add new APIs:
- esp_wifi_set_promiscuous_ctrl_filter
- esp_wifi_get_promiscuous_ctrl_filter
- esp_wifi_get_bandwidth
Reduce the time of station connecting to an AP

2.33 Wi-Fi Provisioning

Add wifi-provisioning and example component

2.34 WPA Supplicant

Disable "Use faster div, esptmod, sqr, montgomery multiplication algorithm" when enable wolfSSL

3. Modified Documents

Revise Breathe version to avoid docs build failure on ReadTheDocs server.
Remove sniffer or promiscuous mode use limitation
Update the toolchain download link URL
Revise header files which are not doxygen style
Add general notes to main page of document
Add gif in doc to introduce how FOTA works
Add factory test example and document
Upgraded Sphinx, Breathe and Blockdiag to the latest versions

4. Tools

Update requirements.txt script for python
Update unit-test-app
Fix the windows install prerequisites issue