public void serverBroadcast(String msg) {
        Message message = new Message();
        message.setType(Message.Type.groupchat);
        message.setBody(msg);
        message.setFrom(selfOccupantData.getOccupantJID());
        broadcast(message, selfOccupantData);
    }
Broadcast a given message to all members of this chat room. The sender is always set to
be the chatroom.

@param msg The message to broadcast (cannot be {@code null})
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java