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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
Ahh... Try changing to
uart.write("\x10digitalPulse(LED,1,10);\n");I guess you have the original firmware on the MDBT42Q? There was an issue where if Espruino tried to print data over BLE but nothing was reading it (as could be the case here?) it'd get stuck. It got fixed some time ago but was just after the 2v04 release, so only 2v05 and later (which haven't been released yet) will have it