# GNU Taler hardware integrations

* snack machine (taler-mdb)
* coin acceptor (taler-coin-acceptor)
* cash acceptor (TBD)

#### Prerequisites
  * GNU gcc tool-chain
  * C standard libraries
  * libnfc
  * libusb
  * libcurl/libgnurl
  * libjansson
  * GNU make
  * GNUNet
  * GNU Taler (exchange + merchant)
  * libqrencode (optional)

#### Tested on
  * Ubuntu LTS (18.04)
  * Raspian Lite (4.19)

#### Hardware used for prototype
  * Raspberry Pi 3B+
  * ACR122U NFC USB reader
  * MDB/ICP Converter from Shanghai Wafer Microelectronics
  * Adafruit PiTFT 3.5" display

#### Description

taler-mdb is a app to run a snack machine as Taler merchant with NFC
payment interface.  Optionally there can a QRCode be shown on a
display to get the payment link.

#### Remarks

  * When using an ACR122 device there may be problems with libnfc.
    [see here](https://github.com/nfc-tools/libnfc) for further information
  * At the moment there is no option to cross compile

#### Build
Building should be easily done with the following three commands:

  ```bash
  ./bootstrap
  ./configure
  make
  ```

#### Configuration

To configure the merchants backend and the product numbers of the
snack machine edit taler.conf file.
