Arduino Pre-Release v3.1.0-RC2 based on ESP-IDF v5.3.0+

The Arduino ESP32 version 3.1.0-RC2 is second release candidate of new major release based on the ESP-IDF v5.3.0 (release notes).

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For version migration, please check Migration Guide from v2.X to 3.X

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System PR

• IDF release/v5.3 by @me-no-dev in #10258
• IDF release/v5.1 by @me-no-dev in #10257
• IDF release/v5.3 by @me-no-dev in #10465

Peripherals

UART

• fix(uart): Add missing HP UARTs for ESP32-P4 by @lucasssvaz in #10447
• feat(uart): uart break example improvement by @SuGlider in #10525
• ESP32-P4 UART Pin Definitions by @SuGlider by #10521

PSRAM

• fix(psram): Init PSRAM before app_main to fix mmu_map by @me-no-dev in #10390
• fix(psram): Do not abort if PSRAM is not found by @me-no-dev in #10395
• test(psram): Add PSRAM test by @lucasssvaz in #10409
• fix(spiram): Fix OPI PSRAM init by @me-no-dev in #10406

SDMMC

• feat(sdmmc): Add SDMMC support for P4 + remove BUILTIN LED by @P-R-O-C-H-Y in #10460

Ethernet

• fix(eth): Set default clock in pin value to zero by @me-no-dev in #10513
• Add RMII Ethernet support for ESP32-P4 by @me-no-dev in #10479

I2S

• fix(i2s): Use separate variables when reading and writing by @me-no-dev in #10509

Touch

• feat(touch): Support NG touch driver for P4 by @P-R-O-C-H-Y in #10448

BLE

• fix(ble): Fixed typos (or copy/paste issues) in comments for AD types in BLEAdvertising by @thomasw-mitutoyo-ctl in #10512

Libraries

LittleFS

• fix(littlefs): Use VFSImpl::exists() to avoid false error log by @BlueAndi in #10217
• fix(littlefs): Add missing dependency by @clashman in #10496

Network Events

• fix(NetworkEvents): Don't skip event callbacks in NetworkEvents::remo… by @LeeLeahy2 in #10337
• fix (NetworkEvents lib): remove checks for duplicated event handlers by @vortigont in #10376

HTTP

• fix(http): Replace flush() with clear() in HTTPClient by @me-no-dev in #10269

ESPNow

• change(esp_now_serial): No teardown on retry limit by @ClockeNessMnstr in #10293

Arduino Stream

• fix(api): Update Arduino Stream class by @me-no-dev in #10328
• Fix missing virtual declarations in Stream.h by @TD-er in #10348

Zigbee

• feat(zigbee): Add Zigbee library by @P-R-O-C-H-Y in #10265
• fix(zigbee): Enable the internal pull-up resistor for BUTTON_PIN by @lboue in #10491

Tone

• Adds setToneChannel() implementation by @SuGlider in #10305

OpenThread

• OpenThread Example Improvement by @SuGlider in #10299

Matter

• feat(matter): initial commit with arduino matter lib by @SuGlider in #10467
• Update Matter Light README.md by @lboue in #10357

RTOS

• feature(rtos): Add Tasks status print function by @me-no-dev in #10515

Wire

• Wire library: Add conditional compilation for second I2C interface based on SOC_I2C_NUM by @sivar2311 in #10408

Boards Additions & Updates

• Added Unexpected Maker OMGS3 by @UnexpectedMaker in #10298
• Added Sparkfun ESP32-S3 Thing Plus board by @Vigeant in #10382
• Add Waveshare ESP32 Touch AMOLED 2.41 by @wurongmin in #10342
• Add IOXESP32-C6 and ATD3.5-S3 board by @maxpromer in #10471
• Add our new board "cezerio dev ESP32C6" by @DogushC in #10462
• Add Waveshare ESP32-S3-Touch-LCD-1.46 board by @Sail-211010 in #10482
• Added variant for Waveshare ESP32-S3-Touch-AMOLED-1.8 by @Y1hsiaochunnn in #10433
• Add the Waveshare ESP32-S3-Touch-LCD-1.85 board by @Sail-211010 in #10477
• fix(build): Fix sdkconfig copy for board manager by @lucasssvaz in #10484

CI & Testing

• ci(push): Use FQBN from ci.json by @lucasssvaz in #10267
• ci(release): Make workflows dependent on release completion by @lucasssvaz in #10260
• ci(tests): Add linpack FPU tests by @lucasssvaz in #10389
• fix(ci): Boards test - get correct file for the diff by @P-R-O-C-H-Y in #10507

Documentation

• docs(contrib): Add instructions on how to test changes by @lucasssvaz in #10221

Tooling

• feat(pre-commit): Add JSON formatter to pre-commit hooks by @lucasssvaz in #10324
• feat(esptool): Update esptool to v4.8.1 by @lucasssvaz in #10524

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Full Changelog: 3.1.0-RC1...3.1.0-RC2

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New Contributors

• @wurongmin made their first contribution in #10342
• @LeeLeahy2 made their first contribution in #10337
• @ClockeNessMnstr made their first contribution in #10293
• @Bharat-Pi made their first contribution in #10402
• @HamzaHajeir made their first contribution in #10415
• @H-sw123 made their first contribution in #10434
• @Sail-211010 made their first contribution in #10477
• @clashman made their first contribution in #10496
• @thomasw-mitutoyo-ctl made their first contribution in #10512
• @zinkett made their first contribution in #10510

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Thank you for your contribution! 🎉