on [<modes>]pong [<serial#>] [-|^]<match> { <action> }

This hook is triggered whenever the client receives a protocol PONG message. Under normal circumstances, the sender will be a server. However, clients are also allowed to send PONG messages to each other. Since there is never any reason for a client to send a PONG to another client, this hook can be useful for blocking PONG floods.

To filter PONG messages from other clients:

 on ^pong "*" {
    if ( rmatch($0 %.%) ) {
       xecho -b Received protocol PONG from $0: $1-
    }
 }