I think it is, the contents of the W5500 folder. You'd have to do some research though - it may be harder than that.
All the software is on GitHub: https://github.com/Wiznet/ioLibrary_Driver/tree/master/Ethernet
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I think it is, the contents of the W5500 folder. You'd have to do some research though - it may be harder than that.
All the software is on GitHub: https://github.com/Wiznet/ioLibrary_Driver/tree/master/Ethernet