Issues after nodejs upgrade

It may occur, that after an upgrade of nodejs (like 12.x > 14.x) the instance of the adapter no longer starts reporting a similar error:

cul.0 | 2021-12-08 12:37:15.438 | error | Cannot open port: TypeError: SerialPort is not a constructor
cul.0 | 2021-12-08 12:37:15.402 | info | starting. Version 1.3.5 in /opt/iobroker/node_modules/iobroker.cul, node: v14.18.2, js-controller: 3.3.21

In such a case, please confirm your device uses the correct serial port. You can do it for example by unpluging it and plug it in again, followed by

dmesg | grep tty

It will return something like

[  672.794475] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[  687.127955] usb 1-3: FTDI USB Serial Device converter now attached to ttyUSB0

revealing the serial port of your device. (ttyUSB0 in this example)

After that do

cd /opt/iobroker/node_modules/serialport/
npm i --production

The instance should now work again.

Source: maxcul adapter - Issue 54