Freifunk Hochstift APT
Debian Buster
deb http://apt.ffho.net buster contrib non-free main
deb-src http://apt.ffho.net buster contrib non-free main
ffho-buster-signing-key.asc
Debian Stretch
deb http://apt.ffho.net stretch contrib non-free main
deb-src http://apt.ffho.net stretch contrib non-free main
ffho-stretch-signing-key.asc
Debian Jessie
deb http://apt.ffho.net jessie contrib non-free main
deb-src http://apt.ffho.net jessie contrib non-free main
ffho-jessie-signing-key.asc
Dig through the pool here