I hope someone will be able to help. I have an array with 4 elements coming from Arduino. I see each one without issue via [print] method after [fudiparse] (or after [cyclone/fromsymbol] if I use a different method), but I only see the first 2 when I unpack them!
In despite of spending hours trying different methods, I cannot get this to work in 1:44 min video:

Here resumed as a picture if easier to understand:

The messages come one by one (or two by two) so the unpack never get a 4 items list.

You can accumulate the messages to 4 this way:

@freq63 +1 to @FFW, but your patch as is suggests you are sending the data incorrectly. On the Arduino side, try printing 4 floats on a single line separated by spaces, then terminate the line with /n (i.e. use Serial.println to terminate the line). You can see an example for 2 floats here: https://forum.pdpatchrepo.info/topic/13086/arduino-to-pd-vanilla/8

you could repack them into a 4-pack if you put the first two and then the second two hit the trigger and make the pack go off. then re-unpack them.

@freq63 said:

Here resumed as a picture if easier to understand:

Aargh. Can't edit my post so here my coment; written in green we are supposed to read "but all 4 elements get printed separately without problem" as seen in my video. Without, not with! Sorry for the typo.

Thanks a lot for the precious help. I'll give my best to try to understand the answers and report back if I'm stucked. I didn't know unpack cannot accept 4 values.
What I find confusing is the fact that all 4 values are printed without issue separately before unpack.

@freq63 said:

What I find confusing is the fact that all 4 values are printed without issue separately before unpack.

separately is the word. [unpack] get the values one (two) after each other so only its (two) first inlet(s) is (are) triggered.

two_pack_four.pd

@freq63 If you want to follow my suggestion, the issue is here in your Arduino code:

As @FFW was explaining, you are putting a single value on each line, but your Pd patch is looking for 4 values on one line. Try this instead:

for (int i = 0; i < 4; i++) {
  Serial.print(myArray[i]);
  Serial.print(" ");
}
Serial.println();

Serial.println() comes after the loop where it only outputs a line terminator once for all 4 values.

I misinterpreted a previous comment. I thought I should add a line break but it was the opposite. I also thought "unpack" was limited to 2 elements. My bad. This is why I took a break, cause I spent too much hours focusing on my issue and confusion did arise. I struggled a little bit but now all is working fine.
Stepping back is always for me the solution. And also dare asking.
Thanks a lot for all the help, the patience and the reactivity.
I very much appreciate.