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41 lines
1.8 KiB
Markdown
41 lines
1.8 KiB
Markdown
Label printing
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====
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To enable label printing, set `FEATURE_FLAG_LABEL_PRINTER` to `true`in your `config.php`. You also need to provide a webhook target that is responsible for printing.
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Why webhook?
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---
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Label printers come in all shapes and forms, and your particular one is probably not the one used by the author of this feature. Also, grocy may does not have a
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direct connection to a local label printer (e.g. grocy is hosted in a cloud vps). Thus, a lightweight implementation is provided by grocy: whenever something
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should print, a POST request to a configured URL is made. The target then is responsible for label printing.
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Reference implementation
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---
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The webhook was developed and tested against a Brother QL-600 label printer, using Brother DK-2205 endless 62mm label paper. The webhook provider implementation was
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implemented into [a fork of brother_ql_web](https://github.com/mistressofjellyfish/brother_ql_web).
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Webhook request
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---
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Requests can be configured to be sent server-side (that is, from the machine hosting grocy through GuzzleHttp) or by an AJAX request directly from the browser.
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The latter is neccesary for situations where the grocy hosting machine cannot reach your label printer, however server-side requests are a bit faster and
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tend to be more stable.
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Both methods fire this request upon printing:
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```
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POST /your/printing/api/endpoint HTTP/1.1
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product=<productname>&grocycode=grocy:x:xxx&due_date=DD:%2021-06-09&...
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```
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If specified, the request body may also be JSON encoded, however the fields stay the same.
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Additional POST parameters (like the font to use) may be supplied in `config.php`. Keep in mind that these config values will be distributed to all clients on all requests
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if the webhook is configured to run client-side.
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The webhook receiver is required to layout and print the resulting label.
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