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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
Afraid not. I2C (as with SPI) tends to require an almost instant response to any data that's sent, and it's not really suitable for Espruino where executing the JS code to get a response might take something like 0.5ms.
If you want to connect Espruinos together I'd recommend using the USART. You can put the transmit line into open drain mode and use a resistor to pull it up, then you can connect a whole bunch of them together. You can even send commands as normal JS if you want to.