Select list item: Attempt to get item number 2 of a list of length 1: ["0"]

MIT App Inventor Help
1

Select list item: Attempt to get item number 2 of a list of length 1: ["0"]
What should I do?
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2

after receiveText, show the text on a label.
you will see that the data is '0', do not contains ','

3

um,, I can not understand. "Are you saying that using commas to separate data is causing issues?"

4

You don't receive all the data before processing it...then your list jrst is too short because it only has one item.

5

With the ReceiveText block, use "-1" for the byte number. In bluetooth properties set DelimiterByte to "10". If you send data from arduino then all data should be sent via "Serial.print(data)", and the last value should be sent via "Serial.println(data)".