Connect your Brother DCP-L2530DW to your WLAN/Wifi network. Find the printer’s IP (make sure it is static, e. g. by setting it up accordingly in your router). Adjust the IP in the lines below.

Scanning

Install brscan4 and xsane.
As root run: brsaneconfig4 -a name="DCP-L2530DW" model="DCP-L2530DW" ip=192.168.1.123

Printing

Install cups.
As root run: lpadmin -p DCP-L2530DW-IPPeverywhere -E -v "ipp://192.168.1.123/ipp/print" -m everywhere

And you are ready to go, enjoy!

PS: If you change the IP, you might need to edit /etc/opt/brother/scanner/brscan5/brsanenetdevice.cfg and /etc/cups/printers.conf.

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For printing via USB (e.g. because you don’t want to have a 2.4GHz network anymore but this sad printer supports no 5GHz), simply install brother-dcp-l2530dw from AUR, “find new printers” in CUPS and add it.