How do I append first 20 characters of a string to a string?

MIT App Inventor Help
1

Looks like this is crashing the app if lblMessages is empty to start with. How do I make this work?

I want to limit the text in lblMessages to the last two sets of characters received (I understand the BLE can only transfer 20 characters at a time)

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2

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That lets you send longer messages.

3

You can use something like this:

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4

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