How to give permission

[HikaruG]

Hello, First thank you for your effort creating this repo. However, I'm having trouble with it. I tried connecting to my UM25C without success, due to some permission issue. I saw that you wrote that one needs to give permission, but I do not know how I should be doing it. I'm sorry for this rather "beginner" question.

[kolinger]

Hello, you need to give your user running rd-usb access to /dev/rfcomm0. You can do this in multiple ways. This is not specific to my application this is basic Linux behaviour.

For example - you can set chmod to be very open with sudo chmod 777 /dev/rfcomm0. This is just workaround - you need to do it every reboot. Or you can add your user to group dialout for example user with name "myname": sudo usermod -a -G dialout myname. But this is specific to your Linux distribution. It can be different.

Please look for guide on the internet for your specific Linux distribution. You will find many.

[HikaruG]

Thanks for your reply. That's intriguing because I already tried adding myself to the dialout group, and it unfortunately did not change the behavior... But understood, you confirmed me that it was not on the application side, so I will look for workarounds on the internet.

[kolinger]

Yes dialout may not work if your Linux is configured in different way.

You can see what group is your Linux using for rfcomm with command ls -l /dev/rfcomm0. You will see something like this:

ls -l /dev/rfcomm0
crw-rw-rw- 1 root somegroup 5, 0 Jul 24 16:59 /dev/rfcomm0

In middle you have root and somegroup. First is user and second is group. Add yourself to this group instead of dialout.