Logfile Zwave Zstick

Setup, Configuration and Use Beginners
1

I use OpenHAB on Raspberry. The Zwave USB stick works fine.
If i look in the logging from OpenHAB, i see the following:

2017-08-21 13:34:02.279 [ItemStateChangedEvent ] - zwave_serial_zstick_4f8172e2_serial_ack changed from 458 to 459
2017-08-21 13:34:02.291 [ItemStateChangedEvent ] - zwave_serial_zstick_4f8172e2_serial_sof changed from 1554 to 1555
2017-08-21 13:34:06.421 [ItemStateChangedEvent ] - zwave_serial_zstick_4f8172e2_serial_sof changed from 1555 to 1556

what does the numbers mean, for example the 458 ?

2

These are frame counters - the number of frames received/acked in the binding.