The ioLibrary means “Internet Offload Library” for WIZnet chip. It includes drivers and application protocols. The driver (ioLibrary) can be used for the application design of WIZnet TCP/IP chips as W5500, W5300, W5200, W5100 W5100S.

This driver provides the Berkeley Socket type APIs.

• Directory Structure

• Ethernet : SOCKET APIs like BSD & WIZCHIP(W5500 / W5300 / W5200 / W5100 / W5100S) Driver
• Internet :
  • DHCP client
  • DNS client
  • FTP client
  • FTP server
  • SNMP agent/trap
  • SNTP client
  • TFTP client
  • HTTP server
  • MQTT Client
  • Others will be added.

• Example, refer to https://www.youtube.com/watch?v=mt815RBGdsA
• ioLibrary Doxygen doument : Refer to TODO in this document
  • Define what chip is used in wizchip_conf.h
  • Define what Host I/F mode is used in wizchip_conf.h

• ioLibrary V4.0.0 Released : 29, MAR, 2018

  • New features added: Library for W5100S added.

• ioLibrary V3.1.1 Released : 14, Dec, 2016

  • Bug fixed : In Socket.c Fixed MACraw & IPraw sendto function.

• ioLibrary V3.1.0 Released : 05, Dec, 2016

  • Internet application protocol add to MQTT Client (using paho MQTT 3.11)

• ioLibrary V3.0.3 Released : 03, May, 2016

  • In W5300, Fixed some compile errors in close(). Refer to M20160503
  • In close(), replace socket() with some command sequences.

• ioLibrary V3.0.2 Released : 26, April, 2016

  • Applied the erratum #1 in close() of socket.c (Refer to A20160426)

• ioLibrary V3.0.1 Released : 15, July, 2015

  • Bug fixed : In W5100, Fixed CS control problem in read/write buffer with SPI. Refer to M20150715.

• ioLibrary V3.0 Released : 01, June, 2015

  • Add to W5300
  • Typing Error in comments
  • Refer to 20150601 in sources.

• Type casting error Fixed : 09, April. 2015 In socket.c, send() : Refer to M20150409

• ioLibrary V2.0 released : April. 2015

  • Added to W5100, W5200
  • Correct to some typing error
  • Fixed the warning of type casting.

• Last release : Nov. 2014