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Add a command/mode for serial RX pass-through/echo

As discussed in this Free Chat I'd like to see a possibility to pass-throuch/echo data received via RX instead of getting an error response.

That would allow for daisy chaining devices (for some of the ones I use already can behave like this, but Nextion HMI breaks the chain).

If it would also be possible to tie that command/mode to a PIO that would open even more options.

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I am now reviewing all of the Feature Requests, this will take some time, patience please.

Suggestion carried

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