• Revert "UIPClient - fix NULL data field checks"
• UIPClient - process incoming data even when remote closed
• restart UDP connection also when logging is off (by Karl Õmblus)

Fixes:

• UIPUdp.cpp beginPacket fix IPAddress check for esp8266 core 3.x.x
• platformio library.json fixes by Ivan Kravets
• UIPClient._allocateData - fix data clear
• UIPClient - fix NULL data field checks

• make hardwareStatus() and linkStatus() work without Erhernet.begin(mac)
• UIPServer.end() - stop() all clients
• fixed library.json for platformio

• major bug fix - wrong calculation of packet position wrapped on RXSTOP
• Enc28J60Network: reserve space for TSV. coded by N.Truchsess in ntruchsess/arduino_uip#103
• solved problem with STM32F3 define in ARDUINO_ARCH_STM32
• sendPacket: fixed Errata 13 workaround and send result returned
• UIPClient - fix of the 'overlay' struct uip_userdata_closed_t
• Enc28J60 object removed. all functions in Enc28J60Network were static
• uip_timer, uip_clock, clock-arch and uip_debug were not used. removed
• Ethernet.tick() - polling for active connection was too frequent. in UIP_CLIENT_TIMER mode (it is default) an active connection was polled every tick()
• UIPClient - added getters remoteIP() and remotePort()
• UIPClient - implementation of availableForWrite()
• UIPClient - sending next packet right after ACK boost the performance
• UIPClient - aborted was not handled
• UIPClient - _write() looped forever if connection timed out
• UIPClient - UIP_WRITE_TIMEOUT instead of UIP_ATTEMPTS_ON_WRITE
• UIPServer - added operator bool() and function end()
• UIPEthernet - added hardwareStatus() (Ethernet 2.00 compatibility)
• Ethernet.h file for super libraries including Ethernet.h

• Fix local UDP broadcast address evaluation with ~ operator on 32bit systems (pknoe3lh)
• Re-fix Errata 14 (Bigpet)
• ENC28J60_USE_SPILIB for ARDUINO_ARCH_AVR and ARDUINO_ARCH_MEGAAVR (jandrassy)
• Add support for Teensy4 boards (IMXRT1062) (rjongeneelen)
• EthernetServer.accept() implementation (jandrassy)
• compilation with logging enabled fixes for megaavr core (jandrassy)
• stm32 blue pill wiring picture corrected (jandrassy)

• bug fixes
• Ethernet lib compatibility: init(cs_pin) and linkStatus
• ARP Table improvement
• UIPServer esp32 core 1.0.1 compilation compatibility
• uipethernet-conf.h options can be specified as -D

Added support SAMD.
Added support ESP32.
Modified librarry information files, and readme.md

Corrected more issues.
Added support for adafruit wiced feather.
Added support for Arduino_Core_STM32.

Corrected more issues.
Added MCU-s, and IDE.