Recently I added a config file to my mod and it works perfectly when in single player mode. However when I start a server and a player tries to join in with different config than the config of server, things don't work as they should. I understand I must use packets to send a packet to client and update it's config values. But... how do I do this. I already have used packets for other things like potion effects, removal of blocks and so on, but I do not know how to do this.