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These functions were changed from private to protected in https://github.com/arduino/Arduino/commit/99f2a2755349784835130147e46cb61659b85893 but the comments were not updated at that time.

In conjunction with equivalent pull requests to Arduino SAM Boards and Arduino SAMD Boards, solves https://github.com/arduino/Arduino/issues/6146.

see https://github.com/arduino/Arduino/pull/5789#discussion_r118007759

This method originally flushed pending input bytes, which makes sense in
Stream. At some point it was changed to flush output bytes instead, but
it was never moved to Print to reflect this.

Since Stream inherits from Print, this should not really affect any
users of the Stream or Print classes. However to prevent problems with
existing implementations of the Print class that do not provide a
flush() implementation, a default implementation is provided. We should
probably remove this at some point in the future, though.

If available() is in the base Stream class, then availableForWrite() should be in the base Print class

use IAD Descriptor for device descriptor per the definition in "USB 2.0 ECN Interface Association Descriptor" and "USB Interface Association Descriptor Device Class Code and Use Model"

See #5732 #4864 #4138 #3946

This reverts commit 817d700a7503b269f986075cad637ce56c657e37.

compatibility of uno wifi dev. ed. with wifi link library

Fix #4784
Close #4791

Forgot to fix ethernet board in previous commit

Avrdude has changed the way it handle unused bits in the extended fuse for atmega 328 and atmega 168, they are now at 1 instead of 0.
See http://svn.savannah.nongnu.org/viewvc?view=rev&root=avrdude&revision=1335 for more info.
This causes avrdude to fail when one try to write the fuse with the unused bits at 0, because the value it read back is not the same than the one it tried to write. This commit fixes the fuse value for all boards that use atmega328 or 168.

Change double quotes to single quotes

Signed-off-by: Patrick Roncagliolo <ronca.pat@gmail.com>

- "." is a string literal, and so is treated as the char '.' plus the null char '\0'.
- Single quotes reduces the necessary memory for this literal to only one char instead.
  A string literal as the one actually present may require the use of the
  method "write(const char *str)", so there could be also a performance overhead.
- Another reason to change quotes style is for consistency with line 235.
Signed-off-by: Patrick Roncagliolo <ronca.pat@gmail.com>

Both serial and OTA upload methods

OTA upload uses the ESP8266 method with a custom upload tool (https://github.com/arduino/arduinoOTA)

While not plainly wrong, since the board is not contained in a 3rd party package, use the "baseline" reference method

Add Arduino.org board definitions

See #2075

remember to correct the core size and checksum when pushing the official core

We'll need to patch avrdude with this new programmer type
https://github.com/platformio/platformio-core/issues/717

Yun derived (Industrial101, YunMini, LininoOne) and Leonardo Ethernet

Fixes #5539

This adds the configuration needed to support JTAGICE3.