app inventor: add arduino sensor data into list and split it using [,]

Hello guys,

i am able to read the data from Teensy 3.2 using app inventor.

what i wanted to do now is convert the sensor data from string to "list" (is this a good way or is there any better ways?)
so that i can split the sensor data using (,)
(i want to push those data to firebase)

i have tried couple ways but it still doesnt work.

can anyone of you help me out ? :cry: :cry: :cry:
(screenshots are attached here)

thanks a lot.

1.PNG

1.PNG

You better ask on an App Inventor forum, as it has nothing to do with the Arduino part as such.