I did an update today to your Marlin version. Unfortunately OctoPrint wired via USB cant connect to the Kossel anymore. There is a serial port available (/dev/ttyUSB0) but connection will get a timeout:
2021-01-09 22:58:10,943 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Opening serial connection"
2021-01-09 22:58:10,953 - octoprint.util.comm - INFO - Connecting to port /dev/ttyUSB0, baudrate 115200
2021-01-09 22:58:10,982 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial connection" to "Connecting"
2021-01-09 22:58:46,132 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Offline"
I did an update today to your Marlin version. Unfortunately OctoPrint wired via USB cant connect to the Kossel anymore. There is a serial port available (/dev/ttyUSB0) but connection will get a timeout: