New configurator backward compatibility

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I believe the best way would be a real online configurator. That is the Dxxx would appear through a web setup and loads it's current information. From there users can configure on the fly with no need for SD cards and this way the true web configurator will be able to tell which firmware version the Dxxx has and accordingly offer only compatible options.

Could this be implemented let's say via an adhoc Ethernet connection ?

This would be a much better approach IMHO since apart from compatibility issues it would also resolve concerns about the current configurator becoming unavailable for some reason in future.

I'd still find the ability to save the configuration in plain ASCII format useful, because it would then provide a mechanism for (external) version control of the configurations - to allow back-tracking if you make a mistake or otherwise prefer a previous configuration.

It should be possible to implement this via the existing Ethernet connection.  Mabye there would be a need to bootstrap the configuration to set IP addresses if not using DHCP.

I suppose there might not be enough non-volatile storage on the Devialet to implement the web server and all the pages needed to support a configurator similar to the one we're used to.