Change Log · ESP8266 Arduino Core

Current version

Allow control of enabling debug and debug level from IDE
Make HardwareSerial::begin() and end() interrupt safe
Put HardwareSerial and cbuf methods called from interrupt context in RAM
Re-enable interrupts before directly enqueuing characters in the UART FIFO
Add espduino board
Rework StreamString::write to use String internal buffer directly (#1289)
Add function to measure stack high water mark
Update SDK to esp_iot_sdk_v1.5.0_15_12_15_p1
Fix RAM corruption caused by our hook of register_chipv6_phy(init_data*).
Optimize PWM interrupt handler for better precision
Add warning levels configurable through Preferences
Protect HardwareSerial's cbuf usage with InterruptLock
SPIFFS: check if path length is valid (#1089)
Set CPU frequency before running setup
Add core_esp8266_features.h to be able to detect the features and libraries included in the ESP core
Added ESPino to supported boards

November 30, 2015

Package link: http://arduino.esp8266.com/versions/2.0.0/package_esp8266com_index.json.

Add file system APIs and documentation
Add ConfigFile example
Allow user to run code in user_rf_pre_init
Add strtoul and strtol, fix strtod
Update documentation for NodeMCU and Olimex boards
Disable interrupts inside ESP.getVcc (#567)
Erase RTC RAM only if RF mode looks invalid (#619)
Get pin levels at time of interrupt, rather than the time of calling the handler.
Move interrupt handlers to ram.
Improve debug output on critical errors
Add ArduinoOTA library and docs
Add WeMos D1 & D1 mini boards
Add documentation about boot messages and mode meaning
Disable sleep mode before doing OTA (#1005)
Add the ability to be called back when the device is about to reset
Add "Reset Method" menu
Add MD5 to core
I2C: generate STOP in case of NACK (fix #698, #254)
Add libc time functions
Fix linker script for 512k(no SPIFFS) variant (#966)
I2S optimizations
Support Sketch > Export compiled binary
Update SPIFFS wrapper for 0.3.3
Fix placement of code into RAM, enable gc-sections
Make soft wdt reset more obvious
Force disable IOSWAP for UART0 in HardwareSerial initialization (#744)
Add IPAddress::toString()

ESP8266WebServer: support for sending of PROGMEM strings
ESP8266WebServer: support for serving files from file system
ESP8266WiFi: fix mode selection (#529)
ESP8266mDNS: allow to work on SoftAP interface
EEPROM: round requested size to 4 bytes (#659)
Add ESP8266AVRISP library
Add ESP8266HTTPUpdate library
Add HTTPClient library
Add WiFiClientSecure
ESP8266WiFi library: add persistent option, fix #1054
Make RequestHandler handle uploads
Add Digest Authentication to OTA and espota.py
Don't close UDP pcbs when WiFi connection drops (#969)
Add espsoftwareserial library
Add HTTP Updater library
Add Ethernet library for W5100
Add SPIFFS WebServer Example
add dnsIP() to ESP8266WiFi class
OTA support encapsulated to ArduinoOTA class
Add gdb stub library
Extracted the WebUpdate example into a library.
Fix to Servo allowing write() to be called before attach()
ESP8266WiFi: add function begin without any parameters and add psk function to return current PSK form sdk config
Fix a crash due to abort() called from TCP error callback (#428)
Adding support for OPTIONS requests to ESP8266WebServer
Add HTTPS request sample (#43)
Fix _useClientMode & _useApMode in SDK auto connect mode (#754)
Add ESP8266WebServer::sendContent_P with 'size_t size' argument for binary content
Fix bug in WiFiClient::write_P when content was binary
Add WiFiClient::write_P to be used with PROGMEM

July 23, 2015

Package link: http://arduino.esp8266.com/versions/1.6.5-947-g39819f0/package_esp8266com_index.json.

I2C library updated to better handle repeated start for certain devices, improved waveforms, higher frequencies for 160MHz core clock, fix case where using different pins would not work with libs calling begin internally.
Add Adafruit HUZZAH board
Add SparkFun Thing board
Add SweetPea ESP-210 board
Add eboot bootloader
Timer0 support
Add PWM range and frequency control
Add ESP.eraseConfig method
Fix pin change interrupt handling (#322)
Add SLC and I2S register definitions
Fix math functions calling themselves recursively (#233, #354)
Print stack on exception and soft WDT reset
Add Updater class
Remove implementations of WDT-related functions
Provide selection between A0 and VCC (#443, #338)

ESP8266WebServer: add gzip streaming, fix sendContent behaviour, add setContentSize method.
ESP8266WiFi: add BSSID, channel, isHidden methods, fix AP/STA mode selection (#28).
Better handling of WiFi disconnect (#231)
Add API to set the beginning of local ports range for WiFiClient.
Add RSSI function
Add function to get the MAC / BSSID as String
Servo library support
Add ESP8266WiFiMesh library
Add ESP8266SSDP library
Add DNS-SD support to ESP8266mDNS library

May 22, 2015

Package link: http://arduino.esp8266.com/versions/1.6.4-673-g8cd3697/package_esp8266com_index.json.

Better connection handling in ESP8266WebServer. The server now sends Content-Length and Connection: close headers, then waits for the client to disconnect. By not closing the connection actively, server avoids TIME_WAIT TCP state, and TCP stack is able to release the memory immediately, without waiting for 2xMSL period. If the client doesn't disconnect in 2000ms, the server closes the connection actively.
Add Hash library, which has a function to calculate SHA1 hash.
SD, Adafruit_ILI9341, and OneWire libraries are now bundled.
Fix incorrect sector calculation in EEPROM library.

May 19, 2015