USB serial converter CP2102 /dev/ttyU0 permissions

[holala]

Hello,

I'm struggling to find what group should I add my user in order to access /dev/ttyU0.
With the root user it works. My user is added to the wheel and dialer groups (on Linux it is the dialout group). May you suggest how to fix this permission problem?

Thanks!

 

[tingo]

the groups dialer or cups are common, but you also need to check what owner, group and permission /dev/ttyU0 has. Simply ls -l /dev/ttyU0 and you will find out.

 

[holala]

Sure, it is permission related issue. My /dev/ttyU0 was readable only by the owner, crw-------.
In /usr/local/etc/devd/ I created a file usbserial.conf with the following content:

notify 100 {
    match "system"        "DEVFS";
    match "subsystem"    "CDEV";
    match "type"        "CREATE";
    match "cdev"        "ttyU[0-9]+";
    action "chmod g+rw /dev/$cdev";
};

Then service devd restart and now I have non-root access to the usb serial.