I want to send pushbutton status from the nrf24l01 module to the app named nrfConnect. I could only find libraries that allow me to send float values. How could I send String values to the app? Thank You!

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nRF Connect is for Bluetooth LE devices, the nRF24L01+ is really not a Bluetooth Low Energy transceiver.

The best the nRF24L01+ can do is make a few Bluetooth LE advertisements but that's very finicky. Here's a long description how: https://dmitry.gr/index.php?r=05.Projects&proj=15&proj=11.%20Bluetooth%20LE%20fakery

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