Compare and pick up parts of text

MIT App Inventor Help
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1

Hi! In my application, I send strings from my ESP32 to my application via bluetooth. I need to compare the text I receive and only get part of it. For example:

-String sent: "v:2500"

I need to compare if my String contains "v:", then assign the value "2500" to a variable. How can I do this?

2

(Canned reply)
If you want to send your temperature and humidity on separate lines, you could alternatively send tag:value pairs, like
T:98.6\n
H:100\n
which would arrive individually if you use Delimiter 10 (\n).
Your AI2 logic would look like

if BT.bytesAvailable > 0 then
  set local message to BT.ReadText(-1)   (to get only 1 line)
  if contains(message, ":") then
      set local splits to split message at ":"
      If (select item 1 of splits) = "T" then
         set LabelTemperature.Text to (select item 2 of splits)
      else if (select item 1 of splits) = "H" then
         set LabelHumidity.Text to (select item 2 of splits)
     else set LabelWhatHappenned to local message
end if

...

3

Wouldn't there be an image with the blocks explaining this example?

4

I forgot I had this:

blocks
blocks799×895 69.9 KB

BlueTooth_YAML_delimiter_sample.aia (3.5 KB)