PROJECT: NFC-A tag test platform

## 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](https://github.com/BlockchainCommons/GordianSeedTool-iOS) NFC read/write functionality.

For example, using:
* [nRF52832DK](https://www.nordicsemi.com/Products/Development-hardware/nRF52-DK) or [nRF52480DK](https://www.nordicsemi.com/Products/Development-hardware/nRF52840-DK)
* Nordic NFC libraries (https://github.com/nrfconnect/sdk-nrfxlib/tree/main/nfc)
* 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:
* a generic app like [Nordic nRF Connect](https://www.nordicsemi.com/Products/Development-tools/nrf-connect-for-mobile)
* a custom app built for this purpose
* a part of "developer test features" included in [Seed Tool](https://github.com/BlockchainCommons/GordianSeedTool-iOS)

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