Nordic BLE SoftDevice, or an open OS and BLE stack like Mynewt/Nimble (https://mynewt.apache.org) or Zephyr
It is possible to set up a board that can be configured to emulate an arbitrary NFC-A tag, readable or writable.
Other combinations of hardware/software are possible - any MCU that has an integrated NFC-A tag peripheral will do.
A mobile app can be used to configure this tag via BLE commands, including loading test data:
Project: NFC-A tag test platform
This project is for interns with interest in hardware, and some experience with hardware development / toolkits.
Adapt an MCU devkit for use as an NFC-A tag test platform for testing Seed Tool NFC read/write functionality.
For example, using:
It is possible to set up a board that can be configured to emulate an arbitrary NFC-A tag, readable or writable. Other combinations of hardware/software are possible - any MCU that has an integrated NFC-A tag peripheral will do.
A mobile app can be used to configure this tag via BLE commands, including loading test data:
May also be possible with some Adafruit hardware and their existing libraries, although there are some gotchas: https://forums.adafruit.com/viewtopic.php?f=58&t=180116&p=876623&hilit=nrf52+nfc#p876514