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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
Yes, I think it's only WIZnet that works at the moment (at least with in-built keys).
I believe
-0x7f00is the out of memory error (the ESP8266 driver takes up too much RAM right now).You could try adding an SD card and loading the keys from that, like in Luke's example.