Just popping in 
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I started looking into the printing part of the Amiga last year , due the lack of support we have today, and as mentioned IPP is the way to go regards the communication. Today most printers support the PWG-raster format. Both ipp and pwg-raster is open source and documented protocols.
Our printers should be autodetected trough mdns/dns-sd protocol. I have made a working sourcecode for detecting printers/scanners trough mdns protocol. ( I use this in Airscan for detecting scanners ).
I have started with the IPP communication and successfully manages to send supported formats to printer, and are able to print to ipp printers.
The remaining part that I struggle with is how amiga os4 sends its binary to print from the print command and trough its device.
I was thinking about copying the rasterport to print and convert it to pwg-raster, but this is as far I have come.
Maybe coders of ipp.device and other printer.devices could offer some help here?
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