install brother printer driver dcp115c mfc210c

I just found it for you my friend, you needed to add a dash to the model numbers like this:
mfc-210c or dcp-115c

https://aur.archlinux.org/packages/?O=0&C=0&SeB=nd&K=dcp-115c&outdated=&SB=n&SO=a&PP=50&do_Search=Go
https://aur.archlinux.org/packages/?O=0&C=0&SeB=nd&K=mfc-210c&outdated=&SB=n&SO=a&PP=50&do_Search=Go

this one list’s both printers and matches the version from their site for the dcp-115c:

yaourt -S brother-mfc-210c

this one is newer but it only lists the MFC-210c, and matches the version from the site for it:

yaourt -S brother-cups-wrapper-extra 1.2.1-1

For the scanner (sane drivers):

yaourt -S brscan2

You can also use octopi to search for and install these as well, just click on in the right panel.