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# 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.
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