ESP-IDF V4.0 has been released

[ESP_Angus]

Documentation for release v4.0 is available at https://docs.espressif.com/projects/esp-idf/en/v4.0/

ESP-IDF v4.0 is a major update for ESP-IDF v3.x. Release v4.0 is mostly compatible with apps written for ESP-IDF v3.x, but there are some breaking changes (please consult the release page on GitHub) and removal of deprecated functionality which will require code changes when updating projects

ESP-IDF v4.0.x will be supported for 18 months until October 2021, according to the ESP-IDF Support Policy. The current Long Term Support release is v3.3.1, v3.3.x will be supported until March 2022.

For full details, new features, release notes, installation instructions, etc then please see the release page on GitHub:
https://github.com/espressif/esp-idf/releases/v4.0

Note: No changes were made between the v4.0-rc release candidate and v4.0.