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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.
@JumJum
Problem was missing SetDeviceInitialised for Serial1.
Now LoopbackA.setConsole() and Serial1.setConsole() works fine.
BTW, looks to me, like LOOPbackA and LoopbackB are not initialised, at least flag is not set.
One more success, Bluetooth.setConsole works fine, and next Serial1.setConsole from my Android with nRf UART V2.0 returns control to webIDE.
Life can be so beautiful.
Now I've to figure out, why Windows10 does not like my ESP32, .......