I am able to send data from my Android phone to my Arduino Uno using the HC-05 module. I also want to send data from the Arduino to my Android phone and I'm unable to do that.
Question: I will send a number from 0-9 using my android app to my Arduino Uno, the Arduino will send back the same number to my app, in words. For now, I am able to send numbers/letters to my Arduino from my app. I want help with the second part of the problem.
This is, in fact, a perfect duplicate of this question Android - receive bluetooth data from Arduino, but, unfortunately, this remains unanswered.