Read text from microbit whith mit app

Hello. I'm new here and beginner with mit app. I'm trying to communicate between microbit and mit app. I'm able to send text to microbit in order to make actions like turning on or off light but I can't send text from the microbit to mit app. If someone could help me.
microbit-Bluetooth_Boutons (1).hex (1.3 MB)
BTstarter.aia (304.5 KB)

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Taifun