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The goal is to allow custom configuration for `variants_dir` to define our own board variant directly in the project.

With this functionnality, we are now allowed to define in our projects a custom board **AND** a custom variant.
https://docs.platformio.org/en/latest/platforms/creating_board.html#custom-embedded-boards

Here is an example of how to define a custom board with custom variant:
```
my_project
├── boards
│   └── custom_esp32dev.json
└── variants
    └── custom-esp32dev
        └── pins_arduino.h
```

custom_esp32dev.json
```json
{
  "build": {
    "arduino":{
      "ldscript": "esp32_out.ld"
    },
    "core": "esp32",
    "extra_flags": "-DARDUINO_ESP32_DEV",
    "f_cpu": "240000000L",
    "f_flash": "40000000L",
    "flash_mode": "dio",
    "mcu": "esp32",
    "variants_dir": "variants",
    "variant": "custom-esp32dev"
  },
  "connectivity": [
    "wifi",
    "bluetooth",
    "ethernet",
    "can"
  ],
  "debug": {
    "openocd_board": "esp-wroom-32.cfg"
  },
  "frameworks": [
    "arduino",
    "espidf"
  ],
  "name": "My Custom Espressif ESP32 Dev Module",
  "upload": {
    "flash_size": "4MB",
    "maximum_ram_size": 327680,
    "maximum_size": 4194304,
    "require_upload_port": true,
    "speed": 460800
  },
  "url": "https://en.wikipedia.org/wiki/ESP32",
  "vendor": "Espressif"
}
```

https://github.com/espressif/arduino-esp32/issues/3652

Do not pollute the global namespace with generic names like 'config' by declaring global variables 'static'.

Fixes https://github.com/espressif/arduino-esp32/issues/4466

pgmspace.h missing 'pgm_get_far_address'

See #3960 for more details of the problem and the solution. I only implemented what was proposed in this ticket, as it solves my problem, which was the same as in this ticket. Credits for the code going to @etrinh ;-)

This also is a more consistence behaviour compared to esp8266, where it also is possible to restart the wifiserver immediately on the same port.

changed to log_d()

..because a firstLine = false; is missing ;)

ESP-IDF release/v3.3: 66d3783c8
esp-face: 420fc7e
esp32-camera: 0107093

Checks to see if a string is a key in the namespace. 

Fixes #4440

* fix typo in WiFiMulti

* clean up trailing spaces

* clean up script file used in cleaning
Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>

This patch fixes update timeouts (error #6) on slow HTTP/HTTPS links.

* Add more options to the AI thinker cam.

The reason is power saving and compatibility of cheap chines clones with crappy flash chips.

* improve & fix BLEScan when too many BLE devices
- when wantDuplicates, no need to check duplicate and no more insert into vector
- delete advertisedDevice when not insert into vector, fix memory leak
- add showParse when you just want raw advertised data

Closes #4111.
gcc: I was not able to find an arm64 build on espressif's website so I choosed to put the armhf version, even if this should works this is only ok as temporary, arm64 runs better on arm64 than armhf :)
esptool: being interpreted python its ok
mkspiff: need igrr/mkspiffs#74 to be merged and artifacts added in /package/package_esp32_index.template.json.

https://github.com/arduino/ArduinoCore-sam/pull/6/files

It is used here:
https://github.com/arduino-libraries/ArduinoMDNS/blob/master/MDNS.cpp#L150

Add sdkconfig option CONFIG_ARDUINO_UDP_TASK_PRIORITY, which sets the task priority for the UDP vtask." (#4131)

Remove device from Peer list if connection fails.

Only call onConnect callback if connection was successful.

Only call onDisconnect callback if the connection was previously connected (ESP_GATTC_DISCONNECT_EVT is fired on a unsuccessful connection attempt also).

Resolves a number of issues with phantom events and callbacks being fired.

::addPeerDevice and ::removePeerDevice are called with m_appId, so should ::updatePeerDevice as all use the same parameter for the underlying map's key.

fixes #4454

closes #4455

* Fix for issue #4158: Crash with stack trace originating in Bluedroid
Improved configuration of scan response data in 'BLEAdvertising' avoids the crash:
- Added member variable 'm_scanRespData' to configure scan response differently from advertising data
- Initialization of 'm_scanRespData' in BLEAdvertising constructor
- Use of 'm_scanRespData' within BLEAdvertising::start() to configure the scan response
- 'Flags' and 'Appearance' are cleared in the scan response data
- With this fix, device names of up to 29 characters can be used without causing a crash.

The web server currently lacks the ability to send a buffer. Only strings are supported.

This PR adds an overload to sendContent.

Make options list into a table

Fixes: #3460

This code has been run in production for 1 month and it looks stable, no data dropped and it definitely fixes the issue described. I think that this can be merged to avoid using custom package referencing in PlatformIO that has been used in quite a few projects for now.
Co-authored-by: Ivan Golubic <ivan@mvt-solutions.com>

Add flash helper constructor to Uri

Add partition label argument to Update and ArduinoOTA classThe UpdateClass in the Updater component has the ability to update data toa SPIFFS partition. It selects the first available partition using theESP-IDF esp_partition_find_first() function.That behaviour is problematic if one has multiple SPIFFS partitions.This change allows a user to pass the label argument (defaults to NULL)to UpdateClass::begin() so a specific SPIFFS partition can be updated.Additionally, ArduinoOTA can set this partition label using thenew method ArduinoOTAClass::setPartitionLabel which is optional.This change does not break compatibility. (#4442)

The UpdateClass in the Updater component has the ability to update data to
a SPIFFS partition. It selects the first available partition using the
ESP-IDF esp_partition_find_first() function.
That behaviour is problematic if one has multiple SPIFFS partitions.

This change allows a user to pass the label argument (defaults to NULL)
to UpdateClass::begin() so a specific SPIFFS partition can be updated.

Additionally, ArduinoOTA can set this partition label using the
new method ArduinoOTAClass::setPartitionLabel which is optional.

This change does not break compatibility.

* Add partition label argument to SPIFFSSPIFFS currently assumes there is only ever one partition.This change allows a user to pass the label argument (defaults to NULL)to SPIFFS::begin() so a specific SPIFFS partition can be referenced.This change does not break compatibility.