Core
- Leverage realloc() in String::changeBuffer()
- Clean up core files
- Add host side tests
- Fix possible null pointer in umm_malloc
- Remove "Upload Using" option from Tools menu
- Move attachInterrupt and detachInterrupt into IRAM (#1734)
- Implement strstr_P
- Allow indefinite duration for tone()
- Fix crashes when using tone()
- Fix RF_MODE and ADC_MODE
- Move micros, delayMicroseconds, millis to IRAM (#1326)
- Fix pulseIn (#1072, #1149)
- Accept both named constant and ADC channel number in analogRead (#1766)
- Enable heap poisoning only when debug options are enabled (#1800)
- Bootloader: don't touch RTC memory if it doesn't contain a valid command (#619)
- Update SDK to 1.5.2 (#1653)
- Clean up variants, fix digitalPinHasPWM definition (#1831)
- Don't set RF mode on boot unless it was overridden
- Change build.board property for boards which renumber pins like NodeMCU (#1878)
- Fix Exception 2 when using printf or vprintf
Libraries
- Update axTLS to 5b4be7d
- WiFiClientSecure: implement connection timeout, fix connected method behavior
- WiFiClient: fix write behavior when connection is closed by remote side
- ESP8266HTTPServer: add font MIME types, fix #1601
- ESP8266mDNS: add client support
- Update SPIFFS to 82aeac6
- Servo: move some functions into IRAM (#1742)
- Update SoftwareSerial to version 3.1.0
- ESP8266SSDP: change templates to include deviceType
- ESP8266WebServer: handle more file types
- SPI: add CPOL setting
- ESP8266WebServer: Fix buffer overflow in ESP8266WebServer::authenticate (#1790)
- ESP8266WiFi: fix undefined behavior in WiFiServer::setNoDelay (#1695)
- Servo: use peripheral clock frequency when calculating FRC1 tick count (#1789)
- ESP8266WiFi: avoid multiple instances of INADDR_NONE
- Add LwIP binary built with gcc
- ESP8266WiFi: Allow PSK instead of passphrase in WiFiSTA::begin
- SPI: Fix SPI.transfer16() using wrong endianness
- HTTPClient: decouple transport layer handling + save some RAM
- ESP8266httpUpdate: decouple HTTPS overloads + save some RAM
- Update and move lwIP headers, add options to use different lwIP build
- ESP8266WebServer: wait for data to arrive
- ESP8266WebServer: save RAM by moving response strings to flash (#1732)
- SPI: Speed up SPI.writePattern()
Tools
- Add ARM tools (#269)