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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.
@Gordon
I've just committed some changes (b63a4f2970faaf853b43746515b6cbe46cb8cbb1) that should sort out the server stability (at least they do for me).
If you do requests very quickly, the W5500 will start rejecting them (as it is only handling one request at a time at the moment) - however you can now completely thrash it, and once you slow back down it'll stay working.
Note: the WIZnet build isn't there yet - the build system broke recently. It should be up in an hour or two though.