Does the teensy 4.1 need to have the ethernet chip fitted. Amazon (UK) can provide versions with or without the chip fitted. Their lowest price offering doesn't state whether it is with or without but the associated image looks as if the chip is fitted.
https://www.amazon.co.uk/Teensy-4-1-Without-Pins/dp/B088D3FWR7/ref=sr_1_3?keywords=teensy+4.1&qid=1675419340&sr=8-3
Hello, without ethernet is what is needed. the software uses usb to communicate with the teensy. I havnt had a chance to try out one with ethernet yet.