This is a fork of https://github.com/espressif/arduino-esp32/tree/idf-release/v4.2 that actually builds successfully when added as a component to a boilerplate project targeting https://github.com/espressif/esp-idf/tree/release/v4.2 .
arduino-esp32 can be added as a component to your esp-idf-based project. These two libraries are tightly coupled and will not compile unless both are on the same release. However, upstream has several other issues preventing a success build, even in a blank project. This fork fixes this, at the cost of removing LITTLEFS and NetBIOS libraries.
See Using as ESP-IDF component (also updated).
- Development Status
- Installation Instructions
- Decoding Exceptions
- Issue/Bug report template
- ESP32Dev Board PINMAP
Latest Stable Release 
Latest Development Release 
- Using Arduino IDE Boards Manager (preferred)
- Using Arduino IDE with the development repository
- Using PlatformIO
- Building with make
- Using as ESP-IDF component
- Using OTAWebUpdater
You can use EspExceptionDecoder to get meaningful call trace.
Before reporting an issue, make sure you've searched for similar one that was already created. Also make sure to go through all the issues labelled as for reference.
Finally, if you are sure no one else had the issue, follow the ISSUE_TEMPLATE while reporting any issue.
Sometimes to program ESP32 via serial you must keep GPIO0 LOW during the programming process