I can recommend this USB Ethernet adaptor for norns (non-shield) folks. It can be found via multiple sellers online, often for a lower price than direct. I use this adaptor on my norns and it has been flawless over the last ~2 years.
As others above have indicated avoiding WiFi is likely desirable if sending a bunch of performance oriented controls via OSC. In the case of using Kyma + norns - the fastest, most reliable path would be OSC from norns => Paca[rana] directly over a wired ethernet connection (assuming one has their Paca[rana] connected over ethernet, which I find more convenient than using Firewire 800)