Hi Josef
Sorry if this comes across a little mean - but looking at your flows and what you are doing, I suspect you are either a bit new to Node-RED and/or a bit new to binary data manipulation?
So rather than tell you where you went wrong I have made 3 demos for you to help you grasp the concepts.
Demo 1 - fixing your original flow...
Demo 2 - A little bit more realistic situation..
Demo 3 - A more usual requirement (parsing Serial or TCP/UDP data strings)...
Full demo flow:
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Hope that helps.
