once I get the docs working I'll post this there, but for now you need the following in matrix.conf at $HOME/.config/raspigaragealert:
{
"server": "https://url",
"username": "username:url",
"password": "password",
"room": !room:url"
}
Obviously the part on the right of the colon needs to be changed to the values you want. The user must already be registered on that server. The user-friendly name of the room cannot be used. (ie you can't use roomname:url) It has to be on that starts with ! then some random letters/numbers. Then colon and the server's URL. You can get that room name by going to share the room (in riot) and look at the room name in the URL.