I did investigate the ethernet shild library. I understand that there MUST be a server. If a server send a message to one cleint, then ALL the client receive that message. that in my case will create a lot of traffic for nothing.
Is there a way that : A server send a message ONLY to one specified client (using his IP or MAc adress) ? in this case, I can send all messsage to a server and adress one by one the clients
Is there a way that a shield send a message only to one of the other 80 shield connected, assuming i need also all message of 80 clients somewhere.