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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 you didn't have GND common between the ESP8266 and RAK then that'd 100% cause the issues you were seeing.
So with it connected it'd be worth re-trying some stuff you did previously in order to see if you have any success.
When booting the ESP8266 will print garbage since the bootloader works at 78400(iirc?) baud - but once booted it should print
readyand work just fine at 155200.