I'm going to bump this with an update, I added +exec server.cfg to the end of my startup line and the set master commands now work fine, it definitely needs the -port command, doesn't work at all without that.
I will post a full solution tutorial when I get this fully working.
EDIT: After doing the above, the rate at which people join DURING a game has increased a lot, but when I haven't used mm_dedicated_force the server still remains empty throughout the day.
I will post a full solution tutorial when I get this fully working.
EDIT: After doing the above, the rate at which people join DURING a game has increased a lot, but when I haven't used mm_dedicated_force the server still remains empty throughout the day.