Core
- Add option to keep FS classes in namespace (#2030)
- Add SPIFFS::end (#1657)
- Add ArduinoOTA::getHostname() interface
- Add __throw_out_of_range
- Add support for RTC user memory in ESP-specific APIs. (#1836)
- Expose RTC_USER_MEM in esp8266_peri.h
- Remove DISABLED macro (#2072)
- Execute global constructors in correct order (#2074)
- Real board name available in Sketch/MDNS/OTA (#2054)
- Add DOUT/QOUT flash modes
- Add ESP8285 entry in boards menu
- Move timer detachInterrupt functions into IRAM (#2083)
- Make Updater be able to run inside async callbacks (#2096)
- Add new boards Phoenix 1.0 & Phoenix 2.0 (#2088)
- Store git version of the core in the compiled binary (#2099)
- Rebuild libstdc++ with mlongcalls and link against it (#1983)
- Add mechanism for posting functions to the main loop (#2082)
- MD5Builder::addStream: fixed falsy calculated hash for len > filelength (#2126)
- Fix SPIFFS.openDir("") (#2143)
- Bring back old semantics to random and randomSeed, add secureRandom (#1710) (#2142)
Libraries
- Wire: I2C bus reset with info to user
- ESP8266HTTPClient: allow HTTP header value without LWS
- ESP8266mDNS: Fix mDNS doesn't accept queryService responses from avahi-daemon (#2015)
- Add MFRC522 to supported libraries (#2044)
- Update axTLS to ab516f7 (1.5.3+)
- Mention ESP8266Ping library
- ESP8266HTTPClient: fix duplicate Content-Length headers (#1902)
- ESP8266HTTPUpdateServer: make HTTP Update Server more secure (#2104)
- ESP8266WiFi: add virtual destructor to WiFiServer class (#2116)
- ESP8266WiFi: fix error when calling
WiFiServer::closemore than once - ESP8266WiFi: WiFi event handling refactoring (#2119)
- ESP8266mDNS: restart listening when WiFi STA is connected/disconnected (#1828)
- ESP8266WiFi: allow DHCP client to be re-enabled using WiFi.config(0U, 0U, 0U) (#1896)
- ESP8266WiFi: enable SO_REUSE in LwIP and WiFiServer (#1431)
- ESP8266WebServer: make ESP8266WebServer::urlDecode public (#1419)
- LwIP: sntp_localtime: return -1 in tm_isdst field (#2010)
- ESP8266WiFi: fix for crash in WiFiClientSecure when WiFi is disconnected (#2139)
- SD: Prevent WDT resets in SD library (#1815)
- ESP8266WiFi: Fix issue when WiFi.begin(ssid, pass) is called right after WiFi.mode(WIFI_OFF)