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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.
indianajones
@Gordon
I'd definitely keep it at or below 921600 - I don't think you'll get anything extra out of it above that and for anything over 100 byte packets (IIRC) you may hit FIFO_FULL errors.
Also I'd start at 9600, get it working, and then raise the speed later - it's entirely possible that at higher baud rates you'll need a lower resistor value, and if you have more than 10cm of wire between devices you may start to hit electrical noise issues as well.