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This question already has answers here: Simplest Way to Connect an Arduino to Android (Wirelessly)? (3 answers) Closed 5 years ago .

I need to send information from arduino to an android phone, having some app actively listening for radio communication from arduino. Using nrf24l01 is that possible?

The best scenario would be direct communication, even without any type of handshake. Arduino sends a number sequence that android expects to receive, and the app alerts me when it ears that sequence.