Auto-save M122 on power-down
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Background
The idea for this sparked in this thread.
The Duet is capable of detection a power-down. Often times here it is requested to provide the output of
M122after an unexpected reboot so the error can be better analyzed. More often than not users have already power-cycled their Duet and so this information is lost.Request
To save this information across a restart it could be possible to have RRF write the result of
M122together with a timestamp (whatever is available here) on power-down/power-loss to e.g./sys/diagnosticsunless it was printing at this time since everything configured withM911clearly has to take precedence then.
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There might be enough time to do that. It wouldn't help if the user had restarted using Emergency Stop or M999 or the reset button.
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@dc42 Yes, there still are cases, where this won't work, but at least it will cover some more bases than now.
