Notification that the connection is stalled (i.e. nothing has been received on the connection for more than the "probeWarningMillis" timeout configured on the ConnectionInfo) or that the connection is working again after being notified as stalled.  

If the connection is notified as stalled and nothing is received for more than the "probeTimeoutMillis" timeout configured on the ConnectionInfo, then the connection is forcibly closed with an onFailure notification. 

void OnActivityWarning(bool warningOn);

void OnActivityWarning(bool warningOn);

Function OnActivityWarning(warningOn As bool) As void