I have installed Ubuntu Core 16.04 (GNU/Linux 4.4.0-135-generic x86_64) in a industrial PC Dell. I'm running Node-Red and now I need to connect serial ports to be read on the PC.
When run node-red displays this error:
2018-11-02T11:49:19Z node-red.node-red: 2 Nov 11:49:19 - [error] serial port /dev/ttyACM0 error: Error: Error: Permission denied, cannot open /dev/ttyACM0
I'd try to set ttyACM0 in a group (called QR) saved in
/home/admin, typing this:
root@4LVL902:/home/admin# ln -s -T /dev/ttyACM0 QR root@4LVL902:/home/admin# ls QR images node-red_0.19.4_amd64.snap snap
But the problem is the same:
2018-11-02T11:41:32Z node-red.node-red: 2 Nov 11:41:32 - [error] serial port /home/admin/QR error: Error: Error: Permission denied, cannot open /home/admin/QR`
I know it's a permission problem, but I'm new to Ubuntu and don't know how to solve it. What folders or files have node-red permission? Do I have to put the QR group under node-red folder? node-red is installed in
Also one of the devices has to install drivers (RS232) to work, but don't know how to do this on Ubuntu Core.