We should check which library versions / codesys compiler is at minimum required. This to realise a maximum backward compatibilty while maintaining stability. I.e. the library should work 100% correct at this minimum version.
summary: Which codesys compiler/libraries are required at minimum --> Which codesys compiler/libraries are required at minimum to achieve maximum backward compatibilty
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Seems to be least as far as v3.5.10.20, just be sure to change the dependancies.