I have a Brother BCP-L2530DW printer/scanner @home

Discover the scanner

$ pkg install sane-backends sane-airscan
$ airscan-discover
[devices]
  Brother DCP-L2530DW series = http://X.X.X.X:80/WebServices/ScannerService, WSD

Copy the results to /usr/local/etc/sane.d/airscan.conf

[devices]
  Brother DCP-L2530DW series = http://X.X.X.X:80/WebServices/ScannerService, WSD

Actually scan

You can now scan

scanimage --format png > myscan.png

or use any graphical application like simple-scan

$ pkg install simple-scan