This code is a library that enables the use of the W55RP20 on Arduino. It is based on earlephilhower's arduino-pico. earlephilhower's arduino-pico : https://github.com/earlephilhower/arduino-pico
For a detailed guide, please refer to the link below. https://maker.wiznet.io/mason/projects/how%2Dto%2Dbuild%2Dw55rp20%2Devb%2Dpico%2Don%2Darduino/