Data isn't receiving to the app

Hi I’ve created an app to receive arduino data transmitted via bluetooth. But it wasn’t success . Plz check this and tell me that what should I do???
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You left off a few things needed to receive messages and get them whole …

In the Arduino code, send a New Line (println())
at the end of every message.

In the AI2 code, initialize the BlueTooth client with Delimiter = 10
to recognize the incoming New Line byte

Run the AI2 clock faster than the Arduino delay so you don’t
fall behind trying to drink from the fire hose.

can you plz show me how to do that????


thanks for your help