Core
- Redefine pgm_read_byte, pgm_read_word as macros to fix detection by libraries (#3140)
- Move ASSERT() macro file text to PROGMEM (#3477)
- Manifest for PlatformIO
- Move debug constant strings to PROGMEM (#3478)
- Initial support for attaching std::function to interrupts
- Link airkiss library
- Mask GPIO interrupts while attaching/detaching ISR handler (#3598)
- Expand varargs correctly in printf_P (#2819)
- Zero out memory in strncpy_P (#2633)
- Fix erase size in ESP.eraseConfig
- Add a workaround-delay in Serial.flush() (#3714)
ESP8266WebServer
- Move MIME type table into PROGMEM to save RAM (#3475)
- Parse parameters in the URL of a POST with empty content (#3398)
- Digest Authentication support (#3053)
ESP8266WiFi
- WiFiClient: apply write timeout to single chunk (#3273)
- WiFiClientSecure: don’t send close alert when opening new session
- Replace r_rand with os_random for LWIP_RAND() (#3499)
- WiFiClientSecure: add loadCACert function (#3610)
- WiFiClientSecure: add option to allow self-signed certificates
- WiFiClientSecure: add support for keys and certificates in PROGMEM
- Don't remove persistent WiFi settings when doing scan (#2946)
Upstream dependencies
- axTLS: update to 2.1.4
- Memory optimization: constants moved to PROGMEM, bigint cache cleared for loaded certificates
- Fix certificate chain verification issues
- sdk: update to v2.1.0-10-g509eae8
- esptool: update to 0.4.12
- Support for 8MB, 16MB flash sizes (image generation and uploading)
- Fix for uploading on OS X with Apple FTDI driver
- Fixes for error reporting
- spiffs: update to 0.3.7+ (f5e26c4)
- mkspiffs: update to 0.2.0
- SoftwareSerial: update to 3.2.3
Boards
- Add DigiStump Oak pins & board
- Add Crystal Frequency menu item for generic board
- Enable 8M and 16M flash sizes for generic board
Documentation for 2.4.0-rc2
Documentation for this pre-release is hosted on readthedocs.org:
http://arduino-esp8266.readthedocs.io/en/2.4.0-rc2/
Obtaining 2.4.0-rc2 pre-release
To install this pre-release using boards manager, follow the instructions, with the package URL replaced with the following one:
https://github.com/esp8266/Arduino/releases/download/2.4.0-rc2/package_esp8266com_index.json