Serial port9/26/2023 ![]() readlines() tries to read all lines which is not well defined for a serial port that is still open. If the n is missing in the return value, it returned on timeout. If it doesn't work, alias names can also be assigned to serial devices by adding them to /etc/udev/rules.d/les. Do specify a timeout when opening the serial port otherwise it could block forever if no newline character is received. To prevent this problem, you can use a symlink created by some kernels, such as the ones found under /dev/serial/by-id/. When using more than one USB-Serial converters, it may happen that the /dev/ttyUSB0 device is named /dev/ttyUSB1 after a reboot. ![]() However on distributions based on CentOS, Fedora, RedHat or Synology DSM only root can write to /var/lock so the permissions need to be updated. If you run openHAB on a Debian or Ubuntu based distribution this should already work. execute sudo -u openhab touch /var/lock/test. Make sure that the user running openHAB can create lock files in /var/lock.If the user added to this group still cannot get permission, rebooting the box to ensure the new group permission is attached to the user is suggested. The user will need to logout from all login instances and log back in to see their new group added. Depending on Linux distribution, you might need to add the user running openHAB to dialout user group.With Debian openHAB installation: sudo usermod -a -G dialout openhab.Depending on openHAB installation method, you should modify start.sh, start_debug.sh, start.bat, or start_debug.bat (standalone/manual installation) or EXTRA_JAVA_OPTS in /etc/default/openhab (Debian installation) If you have multiple serial ports to configure, separate them with colon ( :). Adapt Java command line arguments to include -Dgnu.io.rxtx.SerialPorts=/dev/ttyAMA0 (where /dev/ttyAMA0 is the serial port).dev/ttyAMA0) you might have to configure openHAB to detect and access the port correctly: If you can see issues related to opening the serial port with Linux, and you are using non standard serial ports (e.g. So all the rest here is only relevant for non-openHABian users. OpenHABian comes with a menu option to configure the serial ports automatically. Advanced Functionality and Administrative Tasks.
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