xSIID and NDEF. Not reading the data?

there is an ios version of taginfo for iphone :slight_smile: … check the linked page and scroll down for the link to the iOS version.

if that really is the accurate output, then the NDEF container is basically broken. does it even read on your iPhone?

as for the RFID unit (WS1850S) and why the data is not the same, it feels like this is data corruption. I see in the spec there are two I2C data rates: Fast mode: up to 400 Kbit/s; High-speed mode: up to 3400 Kbit/s … are you pushing data too fast into your ESP32? it’s a major strap-grab but it’s all i have at the moment.