av3…av0 = application version (same format as dv3…dv0)
nmSize: number of bytes that follow for the name (nmN…nm0)
nmN…nm0 = node-name (string which can have a variable length)
snSize: number of bytes that follow for the serial-nr (snN…sn0)
snN…sn0 = serial number (string which can have a variable length)
the serial number may be omitted