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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
Probably Espruino Wifi is a good bet for you then - the STM32F4 chip in it can be put to sleep quite easily, and you can turn Wifi on only when you need it (although it'll still draw quite a bit of power when active!).
I'll make a note to have a search through the docs and change the use of CC3000. I think you'll find that most projects involving the Pico use the ESP8266, and the ones using the original board use CC3000 - as that's what was available at the time.
I'm afraid there's no 6lowpan stuff at the moment, but there is an example of using XBee: http://www.espruino.com/XBee-API1
Actually using a 6lowpan module with Espruino is probably not that hard, and I'll be adding IPv6 over BLE support to Puck.js soon, which could potentially be another option?