How to produce messages with packet type id like 420 430

[Al3x4n]

How to produce messages with packet type id like 420 430? I do send cmd from server to socket.io client like this but nothing response socket.send("start", start_cmd.toString(), new SocketIoSocket.ReceivedByRemoteAcknowledgementCallback() { @Override public void onReceivedByRemote(Object... os) { System.out.println("Start cmd response: " + os); } });

But when I use this cmd, client does received (without callback) socket.send("start", start_cmd.toString())