I have a function block that I don't understand what it is for!
Can anyone help me explain?
where did you get this blocks?
I got from a sample project! But they don't explain anything
These are blocks I don't understand what it means and I cut us in a project!
Where can I find descriptions of these function blocks?
...where? There are millions of App Inventor guides out there.
Here.
Thank you! I didn't notice this!
That bytes received event has a questionable if/then test.
What is the true/false value of a list of numbers?
That's how I convert the value from bytes to decimals
I think it's never going to be false.
The if test should be
If length of list byte values > 3 then...
This is meant to avoid selection of items from short lists.
I just don't understand what they are?
To start learning lists, start at the top of
If you need to learn how bytes and numbers work, see
https://web.stanford.edu/class/cs101/bits-bytes.html
Thanks for the guide!
Since App Inventor is Scheme under the hood, a list of numbers is true 
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