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removes deprecated esp_eth_set_default_handlers()

Summary

Modifies WiFi lib to allow dynamic buffer allocation along with SPIRAM MALLOC enabled
This gives more heap space to the users

Related PR in Arduino Lib Builder: espressif/esp32-arduino-lib-builder#47

Impact

WiFi will work the same as it was in version 1.0.6, restoring free heap.

close #5630
close #5474
close #5699
close #5697

* SPI.h add new call to return a SS pin number used.

As code example states, the SS pin needs to be explicitly set for output for SPI to work, but the pin number have to be coded in addition to the SPI logic in the library, which means this duplicates code. It is much better to just be able to get the pin number from library itself.

* Update SPI_Multiple_Buses.ino to use new pinSS method

Simplify the example case, to show usage of pinSS method. This also simplifies the example, removing duplicated code.

esp-dsp: master e05fc36
esp-face: master f108a83
esp-rainmaker: f1b82c7
esp32-camera: master 3022601
esp_littlefs: master 05d55ab

I2C Slave Implementation

esp-dsp: master e05fc36
esp-face: master f108a83
esp-rainmaker: f1b82c7
esp32-camera: master 3022601
esp_littlefs: master f6e7108

[Docs] Added Python is missing on the troubleshooting section

- Support Wire::end() for Slave
- Prevent Master operations when in Slave mode

Summary

New feature: Add the ability to get the peer certificate of an SSL connectio. This is useful for IoT when the root/cert trust chain has a shorter lifecylce than the device itself. Includes example code.

It adds two methods to the WiFiClientSecure client:

bool getFingerprintSHA256( uint8_t fingerprint_remote_sha256[32]) -- return true and the fingerprint (i.e. the SHA256 of the raw x509 as a DER - identical to what you see in for example your webbrowser). Or false on error.
const mbedtls_x509_crt* getPeerCertificate(); -- return the actual X509 struct or NULL on error.
Impact

No impact; backwards compatible (only adds to the API)

In this PR, we add support for M5Stack Unit CAM to CameraWebServer.
https://docs.m5stack.com/en/unit/unit_cam

When compiling with verbose logging, the build would error with a message saying `len` is not defined in `tud_vendor_rx_cb()`. This change fixes the error.

* SD.open() new feature for creating all folders in path

This PR adds to the SD.open() function option to create all folders to the file.

SD.open(const char* path, const char* mode, const bool create)

Default value of create is false.
When true folders are created.

From issue #5019

* Update vfs_api.cpp

memccpy -> memcpy

* SD_MMC deinit fix

Wrong deinit function was called.

Add the ability to get the peer certificate of an SSL connection; useful for IoT when the root/cert trust chain has a shorter lifecylce than the device itself. Includes example

We don't have submodules.

* Fix build compilation due to changes in the HW_TIMER's structs

* Fix compilation warnings and errors with USB

* Update USBCDC.cpp

* Update CMakeLists.txt

* Update HWCDC.cpp

* Implement Thread-Safe I2C based on ESP-IDF API

* Update esp32-hal.h

* use proper types for size and timeout

* Allow disabling of the HAL locks

* Limit frequency settings to prevent Interrupt WDT

* SD.open() new feature for creating all folders in path

This PR adds to the SD.open() function option to create all folders to the file.

SD.open(const char* path, const char* mode, const bool create)

Default value of create is false.
When true folders are created.

From issue #5019

* Update vfs_api.cpp

memccpy -> memcpy

* File f = open() edit

added false for create

* SDMMC frequency selection based on board type

On Olimex ESP32 EVB I/O operations with SD card can cause error when LAN is used in same time.
Problem is disappearing if SD MMC frequency lower down from SDMMC_FREQ_HIGHSPEED to SDMMC_FREQ_DEFAULT.

No problem if WiFi used instead LAN.

* Code rewritten according to https://github.com/espressif/arduino-esp32/pull/5688#pullrequestreview-759359645

Return size_t instead of uint8_t from BLECharacteristic::getLength().  Allows large MTU to be used. (#5687)

Fix compilation in case NO_GLOBAL_INSTANCES || NO_GLOBAL_SERIAL is defined.

* Add an error check for empty path of an URL

* Append '/' to an URL with empty path instead of returning an error

Fixes boards.txt entries for the atmegazero_esp32s2, and also the platform.txt  --flash_size which is not letting the board compile due to its 32MB size. (#5673)

only use ksz8081 for idf versions later than 4.3 (this fixes compile as component for idf 4.3) (#5599)

esp_eth_phy_new_ksz8081 was added in IDF after version 4.3 and generates a compilation error with IDF-4.3. This change will only use esp_eth_phy_new_ksz8081 for IDF versions after 4.3