Retrieve and send historian time series through OPC Publisher telemetry event path (after downtime or programmatically)

[marcschier]

Is it possible to use OPC's historical access feature to gain access to historical data on the OPC Server side? We have two interesting use cases for this:

When connecting with OPC Publisher for the first time to the OPC Server, we would like to fetch the last two months of historical data. The server does provide this kind of historical access according to the OPC UA specification.
When losing connection to the OPC Server, we would like to fetch all data that has not been consumed during the connection loss when OPC Publisher has successfully reconnected.

We imagine a very simple, straight-forward approach: Adding a command line parameter to pass a timestamp to OPC Publisher from when the data shall be pulled from the OPC server.

Regarding downtime/connection loss: OPC Publisher shall automatically keep track of when the last data was received. In case of a successful reconnect after a downtime: OPC Publisher shall pull off the data from the server for the time it was disconnected.

Hope this helps. Please LMK whether you are planning on an implementation of that feature.