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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.
binux
That branch I posted earlier should help with the bigger MTU - unfortunately you have to request it when initialising the softdevice, and the SD then needs extra RAM. Realistically that means it's not something you can do at runtime because all variables would need to be relocated.
Even so, I think it would be worth losing a bit of RAM permanently for - maybe not to max out the MTU, but at least to go for something significantly higher than 20.