Provide a JSON REST API to `ESC/POS` printers. Most of the time these printers will be thermal printers. 

# Usage

GET `/api/printer/name` to get the UUID of the printer.

GET `/api/printer/status` to get information about the current state of the printer.

To actually print something use POST `/api/printer/print`. The body is an JSON array of print instructions. Following instructions are available.

## Feed

`lines` and `dots` can be used at the same time.

```json
{
    "type":"feed",
    "lines":4,
    "dots":50
}
```

## Text

Only `text` is required.

`alignment`: Can be `Right`,`Left`,`Center`. Default is `Left`.

`underline`,`bold`,`doubleHeight`,`doubleWidth` are obvious and default to `false`.

`fontB`: Use different font. Based on printer model. Default is `false`.

`lineSpacing`: Line spacings in dots. Default is unset. 

`newLine`: Insert a new line after printing the text. Default is `true`.

```json
{
    "type":"text",
    "text":"Hello world",
    "alignment":"Center",
    "underline": false,
    "bold": false,
    "doubleHeight":false,
    "doubleWidth":false,
    "fontB":false,
    "lineSpacing":23,
    "newLine":true
}
```

## Barcode

`barcode`: Value of the barcode. Depending on the `barcodeType` it may only contain numeric characters. Require.

`barcodeType`: What type of barcode. Possible values are: `CODE128`, `UPC_A`,`UPC_E`,`JAN13_EAN13`,`JAN8_EAN8`,`CODE39`,`ITF`,`CODABAR_NW_7`,`CODE93`,`GS1_128`,`GS1_DATABAR_OMNIDIRECTIONAL`, `GS1_DATABAR_TRUNCATED`,`GS1_DATABAR_LIMITED`,`GS1_DATABAR_EXPANDED`. Default is `CODE128`. Depending on the printer modell not all types are supported.

`barcodeCode`: I honestly have no idea what exactly this changes. But it changes something. Default is `CODE_B`.

`alignment`: Just like `alignment` in the "Text" instruction. 

`labelPos`: Position of the value of the barcode in text form. Possible values are : `None`, `Above`, `Below`, `Both`. Default is `Below`.

`height`: Height of the barcode in dots. Default is unset.

```json
{
    "type":"barcode",
    "barcode":"348234445AA",
    "barcodeType":"CODE128",
    "barcodeCode":"CODE_B",
    "alignment":"Center",
    "labelPos":"None",
    "height":45,
}
```