Port /dev/ttyACM0 does not exist in Raspbian GNU/Linux 10 (buster)

[MDAR (Stuart Hanlon, UK importer of Velbus hardware)]

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USB Problems on linux

I am trying to figure out how USB works on openhabian on rpi3B+. On windows USB sticks shows up as com5, com17 and so on.. And the numbers changes on reboot. On my RPI I seem to experience the same: So i have a usb rs485 dongle using the modbus binding, this now throws me tons of errors, and this is enough to make the whole Openhab to freeze, GUI, works fine, but no other events are occuring!! 2018-10-30 07:40:17.639 [ERROR] [et.wimpi.modbus.net.SerialConnection] - open port failed: Unknown L…