*`mediaurlpath`: The public HTTP url for accessing media sent by a Matrix user. The parts in curly brackets will be replaced with the proper values. Check what to set the domain to by right-clicking a media file in Element.
*`matrixdomain`: The part after the @ in your username.
*`matrixuser`: Bot account username for this bridge.
Chat commands can be issued in any room the bot is joined to.
*`!sms 1234567890`: Create a new empty SMS room for the provided phone number, and invite all `invitusers` to the room. Texts will send from the `smsfrom` number.
*`!sms 1234567890 9876543210`: Create a new empty SMS room, and invite all `invitusers` to the room, as above. Texts will send from the second number entered.
*`!fixusers`: Goes through all the SMS rooms, checking membership against `inviteusers`. If anyone's missing from a room, they're invited back.