nRF Connect Linux

[Jim Peschke]

Cannot connect to nRF52840DK board using nRF Connect Bluetooth Low Energy app on Linux (Ubuntu 18.04 LTS).  When I choose "Select Device" and choose my board, I get:

"Validating connectivity Firmware..."  followed by "Error while setting up device xxxxx.  Permission denied, cannot open /dev/ttyACM0"

Port ttyACM0 does exist, and most strangely, if I run the Programmer app under nRF Connect, it works fine.  It can connect to the board and perform all operations.  The same board run under nRF Connect / Bluetooth Low Energy on a Windows 10 PC works fine.

I did recently update both nRF Connect and BLE on the Linux laptop to v3.2.0 and 2.3.1 respectively.  The Windows PC is running nRF Connect v3.0.0 and BLE v2.3.0.  I am afraid to upgrade either until I understand what is happening with the Linux installation, as it used to work.

[Vidar Berg]

Linux systems usually don't give users permission to access the serial port by default. You may run nrf-udev to change it. Alternatively,  add your user to the dailout group. 

Edit: the programmer app will normally flash the device with Jlink. Access to the serial port is not needed then. 

[Jim Peschke]

Thanks.  That worked perfectly.  I added my user to the dialout group as follows:

whoami - (To get the user name)

sudo adduser <username> dialout

sudo reboot