How we Read 31 bytes Data in Serial Communication

[StefanL38]

Does the 31th byte have always the same value?

If yes you could check for this byte as endmarker.
Robin2 has a great tutorial serial input basics updated about this

Serial Input Basics - updated

Updated Version Please note that this is a revised version of the advice in this earlier Thread which has become very long. As far as possible I have kept the code examples identical or simplifed them slightly. It should not be necessary to refer to the older Thread, but feel free to do so. Contents The following sections are in this Tutorial Introduction Serial data is slow by Arduino standards Example 1 - Receiving single characters Why code is organized into functions Exampl…

best regards Stefan