> tstbackend -d mustek_usb -l1 (recursion = 1)
>           TEST: options consistency
>         warnings: 0  error: 0  checks: 1379
>
> tstbackend -d mustek_usb -l1 (recursion = 2)
>           TEST: options consistency
>         ERROR   : cannot get boolean option 12 value (Invalid argument)
>         ERROR   : cannot set boolean option 12 value (Invalid argument)
>         ERROR   : cannot set boolean option 12 value (Invalid argument)
>         ERROR   : cannot get boolean option 12 value (Invalid argument)
>         ERROR   : cannot set boolean option 12 value (Invalid argument)
>         ERROR   : cannot set boolean option 12 value (Invalid argument)
>         ERROR   : cannot get boolean option 12 value (Invalid argument)
>         ERROR   : cannot set boolean option 12 value (Invalid argument)
>         ERROR   : cannot set boolean option 12 value (Invalid argument)
>         warnings: 0  error: 9  checks: 2270

That is probably a design flaw in tstbackend related to the recursion.
I'll think about it.

Frank.

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