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Fixes: https://github.com/espressif/arduino-esp32/issues/5488

CLASSIC_BT_ENABLED never worked as was incorrectly named, e.g. see
https://github.com/nkolban/esp32-snippets/issues/890#issuecomment-521520934
Now corrected to the update-to-date name CONFIG_BT_CLASSIC_ENABLED.

Fixes: #5375
Fixes: #5050

esp-dsp: master f4d7d6e
esp-face: master 420fc7e
esp-rainmaker: f1b82c7
esp32-camera: master 6a9497b
esp_littlefs: master b58f00c

Adding first version of PULL_REQUEST_TEMPLATE.md.

The purpose of this template is to improve and simplify writing more accurate Release Notes.

Newly compiled esp32-camera driver from https://github.com/espressif/esp32-camera

lwip lib bundled with esp32 Arduino supports only one ntp server. Any additional servers set are just silently ignored.
This default is different from esp8266 Arduino core and very confusing. Most of the examples provided uses 3 different ntp servers for redundancy while only the first one is used actually.
Addressing issue #4964

Fixes: #5429

Closes #5398

Using the same non-blocking socket connect pattern for respecting connection timeout, copied from WiFiClient::connect.

WiFiClient::connect uses lwip_connect_r, whereas start_ssl_client uses lwip_connect. I haven't found what is the difference between them. I tested both, both work ok, so I kept lwip_connect.

- Device will not reset if previous baudrate was not 9600
- CDC Device is not recognized if WebUSB is enabled

* Fix compile archive arguments for the new toolchain

* Add menu to S2 for picking through which port to upload

Internal USB CDC requires to reset and wait for the new port (because persistence is not yet stable)

* USB CDC should also be started in main

* Fix URL and USB version for WebUSB

* Update vendor callback API

* Update CDC::write to use TX_DONE semaphore

* Update USB_Serial example

Links to the new docs updated and new docs build badge added

- add callback function to HTTPUpdate
- update example to print httpupdate progress
- fix ArduinoIDE syntax coloring
Signed-off-by: Jayantajit Gogoi <jayanta.gogoi525@gmail.com>

A typographical error is corrected in the 2nd line of the comment. 
From = " This is un example howto use Touch Intrrerupts "
To = " This is an example of how to use Touch Intrrerupts "

This PR is the initial documentation structure including the basic information about the project and Sphinx configuration.

####CONTENTS:
- Getting Started
- Installing
- Boards
- Libraries
- Library Builder
- Tutorials
- ESP-IDF as Component
- OTA Web Update
- makeEspArduino
- Troubleshooting
- Contributing

This PR also changes the README.md.

Fixes: https://github.com/espressif/arduino-esp32/issues/5376

* Update toolchain

* Update package_esp32_index.template.json

* add optional component dependencies after Kconfig options are known (#5404)

Until this commit, Kconfig options (e.g. CONFIG_TINYUSB_ENABLED) were
used in conditions preceding idf_component_register to determine which
components need to be added to `arduino` component requirements.
However the Kconfig options aren't known at the early expansion stage,
when the component CMakeLists.txt files are expanded the first time
and requirements are evaluated. So all the conditions evaluated as if
the options were not set.
This commit changes the logic to only add these components as
dependencies when the Kconfig options are known. Dependencies become
"weak", which means that if one of the components isn't included into
the build for some reason, it is not added as a dependency.
This may happen, for example, if the component is not present in the
`components` directory or is excluded by setting `COMPONENTS` variable
in the project CMakeLists.txt file.
This also ensures that if the component is not present, it will not be
added as a dependency, and this will allow the build to proceed.

Follow-up to https://github.com/espressif/arduino-esp32/pull/5391.
Closes https://github.com/espressif/arduino-esp32/issues/5319.

* IDF master d93887f9f

* PlatformIO updates for CI (#5387)

* Update PlatformIO CI build script

- Switch to the latest toolchains 8.4.0 for ESP32, ESP32S2, ESP32C3
- Use PlatformIO from master branch for better robustness

* Update package.json for PlatformIO
Co-authored-by: Ivan Grokhotkov <ivan@espressif.com>
Co-authored-by: Valerii Koval <valeros@users.noreply.github.com>

Commit d15e1b0e [1] in the 2.0.0 pull request #4996 introduced a filter
to connect only to WiFi networks with a RSSI of -75 or better. This
results in strage behaviour, as a scan still shows networks, that can't
be connected to, even though with older versions, connecting to those
networks was possible and the connection (albeit slow) was stable.

Remove the RSSI filter for now by setting the threshold to -127, i.e.
the lowest possible value. Maybe in the future the filter threshold
could be exposed to users, to allow filtering out nearly unreachable
networks.

[1] github.com/espressif/arduino-esp32/pull/4996/commits/d15e1b0

Closes https://github.com/espressif/arduino-esp32/issues/5378

Fixes: #5041

Fixes: https://github.com/espressif/arduino-esp32/issues/5128
Fixes: https://github.com/espressif/arduino-esp32/issues/5324

Fixes: https://github.com/espressif/arduino-esp32/issues/5103

* Add back ARDUINO_EVENT_WIFI_READY

Fixes: https://github.com/espressif/arduino-esp32/issues/5315

* use strncpy and strncmp for WiFi SSID and Password in AP and STA

Fixes: https://github.com/espressif/arduino-esp32/issues/5367

* Implement timeout for waitForConnectResult

Fixes: https://github.com/espressif/arduino-esp32/issues/5330

* Remove old definition of "reverse" from stdlib_noniso

Fixes: https://github.com/espressif/arduino-esp32/issues/5045

* Make "reverse" noniso conditional on ESP_DSP

arduino-esp32 has to depend on main in autostart mode, for setup() and loop(),
but this can be done with undefined symbol entries to avoid a large dependency
cycle and other linker errors.

Closes https://github.com/espressif/esp-idf/issues/6968

Fixes #5362

Fixes #5112
Call to pinMatrixInDetach() was changed from version 1.0.6 in version 2.0.0 injecting a bug as seen in cores/esp32/esp32-hal-uart.c
https://github.com/espressif/arduino-esp32/commit/80418fadcfb91c75d5100a8fddeb9318a8ef7d42Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>

reference: https://github.com/espressif/arduino-esp32/issues/102

In current master, after get.exe, there's tools/mkfatfs.exe that must be ignored.
Also cleaning up a simple duplicate line in .gitignore.
This is for Windows only, any hints on what can be done for Linux, Mac, is appreciated.

Fixes: https://github.com/espressif/arduino-esp32/issues/5337
Fixes: https://github.com/espressif/arduino-esp32/issues/4743

Thanks to @maxgerhardt

* Make String::concat() faster for some types.

This patch removes the unneeded call to `strlen()` when concatenating some types to a `String`. Additionally it fixes some whitespace for consistency.

* Update WString.cpp

Stale bot labels fix.