nerves_io_nfc

Nerves support for libnfc-compatible USB NFC readers.

Limitations

Furthermore, this library currently only reads the tag UID of Mifare tags. The LibNFC supports reading and writing MIFARE tag data, but this library does not yet support it. Pull requests welcome!

Installation

1. Add nerves_io_nfc to your list of dependencies in mix.exs:

```elixir
def deps do
  [{:nerves_io_nfc, "~> 0.1.0"}]
end
```

1. Ensure nerves_io_nfc is started before your application:

```elixir
def application do
  [applications: [:nerves_io_nfc]]
end
```

Usage

Add the Nerves.IO.NFC GenServer to your supervision tree:

worker(Nerves.IO.NFC, [{RfidReader.Handler, :tag_scanned}])

When a tag is scanned the function RfidReader.Handler.tag_scanned() function will now be called with the hex-encoded serial number (UID) of the scanned tag as its single argument.

Note: the USB needs to be plugged in before the application starts. USB hot-plugging is currently not supported.