Created question in FIWARE Q/A platform on 07-04-2023 at 10:04
Please, ANSWER this question AT https://stackoverflow.com/questions/75957585/fiware-prevent-data-loss-due-to-network-issues-between-sensors-and-orion

Question:
Fiware - prevent data loss due to network issues between sensors and Orion

Description:
I'm wondering about how to prevent data loss due to network issues between sensors and Fiware Orion.
Example:
A smart industry is using some sensors and actuators connected to PLC.
This PLC is an OPC UA server.
The OPC UA IoT agent is used to fetch and subscribe to this server's values and forward them to the context broker (Orion NGSIv2).
During one hour, a network problem / maintenance disconnect the IoT Agent from the OCP UA server (PLC). The production line is still producing data during this time.
Questions:

What is expected in this case ?
Do IoT agents can store data that are not successfully send to the context broker ?
Do OPC UA IoT agent is able to use OPC UA Historical Access (HA) to recover previous values ?

I set up a sandbox environment to test if it was possible to ask Orion for the history of data stored on the OPC UA server.
The IoT Agent documentation doesn't seem to address this topic.
This documentation is speaking about sensors making measurements every hour and sending data once everyday. It may be related ?
Thank you
Best regards,