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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
If possible the best way is to use flow control.
You can either you can use XON/OFF software flow control when setting up the Serial device, or you can do hardware flow control too - you then just need to set the modem up to use it