title: Netty - how to get all client channel?
body: <p>I was using netty example codes - telnet packet, Now the code can establish server and client to chat using telnet, but client can only talk to server. I am rewriting it to make the clients can talk to all the clients, so I need to keep a channel list, so when a client is contact the server, the server can send the message to all of the clients.
  Can anyone tell me how could I get all clients channel?
  (The example code is <a href="https://github.com/netty/netty/tree/master/example/src/main/java/io/netty/example/telnet" rel="noreferrer">enter link description here</a>)</p>