I think there may have been a confluence of issues here - it looks like dns wasnt working correctly. I had to switch where it got the time from anyway, so i did that. Also, the wiz550io seems to behave badly when the espruino is reset (losing sockets) and requires power to be removed for an awkward length of time to reset.
If theres a way to reset the wiznet controller from software, i think espruino needs to do that when initializing it. If not, im going to wire up the nRST pin of the wiz550io and reset it that way before i start talking to it
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