Heartbeat

This packet is sent by the client to the server in order to let it know that their connection is still alive and functioning.

If the server doesn't receive a heartbeat within a certain amount of time, the in-active client will be disconnected.

Note: Regardless of the heartbeat packet being sent or not, clients are still disconnected if they have done nothing within 15 minutes due to client-side code within most loaders (it's something the flash clients automatically do).

Examples

Client-side	%xt%s%u#h%1%
Server-side	%xt%h%1%