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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.
@RandallSY
This is what dmesg reports, seems OK.
[ 1865.522240] usb 3-9.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1865.522242] usb 3-9.2: Product: STM32 Virtual ComPort
[ 1865.522243] usb 3-9.2: Manufacturer: STMicroelectronics
[ 1865.522244] usb 3-9.2: SerialNumber: 00000000001A
[ 1865.551474] cdc_acm 3-9.2:1.0: ttyACM0: USB ACM device
[ 1865.559307] usbcore: registered new interface driver cdc_acm
[ 1865.559309] cdc_acm: USB Abstract Control Model driver for USB modems and