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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.
@fanoush
github has quite nice search, you can go to https://github.com/espruino/Espruino and it topleft corner enter e.g. ublox or casic or nmea and click 'in this repository'
As for using Serial2 - instead of finding random pins for Serial1 it could also work to configure just rx or tx, so do Serial1.setup with just
tx:and then setup Serial2 with justrx:and hook into Serial2 'data' event to get replies and still write to Serial1