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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.
@maman
I found this issue :
https://github.com/espruino/Espruino/issues/830
I inject this instruction : LoopbackA.setConsole(), via mqtt protocol to the device,
then the serial data is coming to the server app.