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<== Date ==> <== Thread ==>
Subject: Re: Using autosave to restore device settings after a reset without rebooting IOC
From: Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Date: Mon, 21 Jun 2021 11:03:10 +0200
I would also agree that autoSaveRestore looks like a reasonable way to handle this.

More general, I would argue that for any remote device, PINI does not make sense in many cases, as the device may not be accessible when the IOC boots.
Instead, the device support needs to implement some adequate configurable behavior in the case of (re)connection.
StreamDevice has the @init exception handler to do that.
For OPC UA, I created a menu-type config parameter with the options "read", "ignore" and "write" - the obvious and easy ones.
Some devices can signal if they did a warm or a cold reboot, connection drops may need to be handled differently from reboots... once you look closely, it gets messy.

Cheers,
~Ralph
References:
Using autosave to restore device settings after a reset without rebooting IOC Mark Rivers via Tech-talk
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