Just opened my events log and a whole number of curious entries in there as well. Some examples:
2020-10-03 09:23:50.472 [vent.ItemStateChangedEvent] - zwave_serial_zstick_c57535c9_serial_nak changed from NULL to 0
2020-10-03 09:23:50.473 [vent.ItemStateChangedEvent] - zwave_serial_zstick_c57535c9_serial_can changed from NULL to 17
2020-10-03 09:23:50.473 [vent.ItemStateChangedEvent] - zwave_serial_zstick_c57535c9_serial_oof changed from NULL to 0
2020-10-03 09:23:50.473 [vent.ItemStateChangedEvent] - zwave_serial_zstick_c57535c9_serial_cse changed from NULL to 0
2020-10-03 09:23:53.663 [hingStatusInfoChangedEvent] - 'zwave:serial_zstick:c57535c9' changed from OFFLINE (COMMUNICATION_ERROR): Serial Error: Port /dev/ttyACM0 does not exist to ONLINE
2020-10-03 09:23:53.664 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node23' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.664 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node24' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.664 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node26' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.664 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node29' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.683 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node20' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.683 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node21' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.684 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node34' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.684 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node22' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.685 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node9' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.685 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node31' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.685 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node32' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.685 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node8' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.686 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node33' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.686 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node2' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.686 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node17' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.686 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node19' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.686 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node10' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.686 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node15' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.687 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node11' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.687 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node14' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.687 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node12' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.688 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node13' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.688 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node25' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.688 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node4' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.688 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node7' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.689 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node3' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.689 [hingStatusInfoChangedEvent] - 'zwave:device:c57535c9:node5' changed from OFFLINE (BRIDGE_OFFLINE): Controller is offline to ONLINE
2020-10-03 09:23:53.689 [me.event.ThingUpdatedEvent] - Thing 'zwave:serial_zstick:c57535c9' has been updated.
2020-10-03 09:23:53.689 [me.event.ThingUpdatedEvent] - Thing 'zwave:device:c57535c9:node7' has been updated.