pongKeepAliveTimeout property
Controls how long to wait for a reponse to a heartbeat ping before concluding that the connection has dropped.
Shorter values will make connection state change notifications more
responsive as it will only change to disconnected after this much time has
elapsed, but overly short values may result in spurious disconnection
notifications when the server is simply taking a long time to respond.
Defaults to 2 minutes.
Implementation
final Duration pongKeepAliveTimeout;