W. H. Heydt wrote:which makes it a case of creating a new thread on the same topic as a closed thread, and that is a violation of Forum rules.
Where is the forum rule written which says no new thread can be started on the same topic as a closed thread?
Is it possible that rule and others have been replaced by the single rule "be good to each other"
Or the corollary "don't annoy the mods". We know who's sockpuppeting, so please don't stir the pot with speculation.
Regarding OP vs unique serial numbers:
- The SMSC LAN chip has a random MAC. We set it on boot to be the Pi-specific OUI+trailing bits of the SoC serial number.
- The BCM wifi/bt chip has a MAC address embedded in NVRAM. It's set to the same as the Ethernet MAC address (derived from SoC serial number) but with the lower 24 bits inverted compared to the Ethernet MAC address.
- Any USB device is "supposed" to have a unique serial number. Of course, virtually no manufacturer of commodity devices actually implements programming of this number so most often it's zero or a value shared with every other device made in a particular month. The only devices I've seen that reliably have unique serials are FTDI interface devices.
- Any 1-wire device attached to the Pi has a 64-bit random serial number as this method is used to identify devices on the bus.
- SD cards are supposed to have "random" serial numbers. In general these follow the same rigorousness of application as USB devices - but the big manufacturers (that produce flash and controller together) usually implement it properly.
Of course, the SD controller is a MCU in reality - with a command space that's vendor-defined thus pretty much anything can be stored in it. The thing I'd trust the least in any Pi system would be the SD card. You can even hack them if you know how.
Rockets are loud.