How to get client connection status?

[ZootHii]

Is there a way to know the connection status like opcUaClient.isConnected().

Thank you.

[kevinherron]

Use OpcUaClient::addSessionActivityListener to be notified when the session goes active/inactive.

There is no direct isConnected method because the client is, in theory, transport agnostic, and transports like HTTP or a future UDP-based tranpsort wouldn't ever be "connected" like a TCP connection would be. So instead the library reports whether you have an active session or not.

Once you call OpcUaClient::connect the library will always be working to stay connected with an active session, you are not required to do anything other than add a SubscriptionListener via UaSubscriptionManager::addSubscriptionListener so that you can re-create subscriptions after the client reconnects if the onSubscriptionTransferFailed callback is invoked.