Serial port '/dev/ttyACM0' could not be opened.

Issue information:

On a brand new openhabian install, v 1.8 I could not get the ACM0 serial port working on the primary UART on Raspberry pi.

I ran the openhabian serial configuration tool for razperry/knx and it set the available ports and enabled bluetooth mini uart overlay, however it did not work anyway.

Debug information:

KNX binding gave the following error

KNX exception (KNXException, Serial port '/dev/ttyACM0' could not be opened. Available ports are:

System information:

PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

aarch64

Solution

The openhabian config tool did not change the /boot/cmdline.txt file, so it still had the following info: console=serial0,115200, console=tty1

Removing that information from cmdline.txt freed up the serial port and KNX is now working.

openhab / openhabian