BadWaitingForInitialData for ExternalPolled nodes

[martenbyebye]

Hi,

I have some nodes which are configured as NodeHandleType.ExternalPolled. When I subscribe using the UaExpert, the initial value is null and the status code is BadWaitingForInitialData.
I put the sampling interval to 90 seconds (The publishing interval is much faster). Only after waiting 90 s, the node's value is properly there.

What do I have to do to avoid that? How to set initial data for ExternalPolled nodes? The read works immediately.

Best regards