I think we might need another term for working both remote and with a flexible schedule. I'm working remote, have been at a few jobs, but while my location isn't an office, my schedule is fixed, the same as if I were going in.
My read of the proxmark code (https://github.com/RfidResearchGroup/proxmark3/blob/master/c...) is that the `ndefformat` formatted the tag MAD (https://www.nxp.com/docs/en/application-note/AN10787.pdf), which you'd do for NDEF, then had a single TLV TERMINATOR at the block where the NDEF message starts. Then he used NFC Tools to write on an NDEF text record (which iOS background reading would ignore) and maybe something else? After that he then used `ndefwrite` to write on a URL record. I wonder if he could have skipped the NFC Tools and written the URL record and gotten the same result. Proxmark dumps before and after using NFC Tools would be insightful.
Basically the reader writes data back to the fob and expects to see it the next time it reads it. This results in either the original or the copy getting de-synced.
One interesting capability that this unlocks is that battery powered, offline readers (think apartment door that uses the same fob as the lobby) can write out things like battery state so that apartment maintenance knows when it's time to swap out batteries.
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