I am trying to write code to 'blink' a switchport by connecting an arduino that will start an ethernet session and close it every 1-3 seconds or so, to identify the switch port on the other side. I found ethernet.begin but it appears there is no ethernet.end or ethernet.close. Is there any way to do this? I looked into a software reset with asm volatile (" jmp 0"); but this doesn't seem to lose link either (except once in a rare while).
Anyone have any ideas what I can do? This should be super easy..