So many questions... And many of them is hard to answer without testing+playing around.
Coming soon. "gateway-refactoring-branch" will soon be merged into development-branch. Try now if you want.
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Relays usually have bot NO/NC outputs. Not sure I understand what you mean fully.
Yes, see the signing support in library.
Probably works on a nano but you have to test yourself.
Hard to answer. Guess testing in your environment is the only way to know.
Same answer as 7
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