Bluetooth profile (Atsamb11)

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Hi I am using a an SAMB11-xplained PRO board for learning bluetooth programmation which is needed for my project. I have started to look the examples in atmel studio and I understand a good part of it. However, one thing that I don't get is which bluetooth profile should I use for my application and how I configure it. My application is very simple the Atsamb11 will measure temperature from a GPIO connected device and send it to an android app via bluetooth.
For the beginning I would like to create a simple program that sends "Hello World" to the android application. I looked into the examples and it seems that the function "at_ble_characteristic_write()" from "ble_manager.h" is the one to use. Before using this function, I need to understand which profile I should use and how I configure it.