Hey! So… it appears that Samsung has changed their firmware in the latest release of the SHS-3321 lock so it no longer supports NTAG213 chips. This strikes at the heart of the issue surrounding compatibility - it relies 100% on lock manufacturers.
I think it’s time to start talking about open sourcing a deadbolt lock design.
Let’s focus on mechanical design first, then electronics second. My personal preference is for a lock that kinda looks like a NEST thermostat on the outside… RFID/NFC only… battery box on the inside… no extra holes that need to be drilled into the door, just use the holes drilled for the lock itself.