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Can I create a simple ble application without creating a service?

Hi, I have PCA100040 development board. I need to create two simple ble application. One for central and one for peripheral.

  1. How can I do this?
  2. Can anyone suggest simple example code?
  3. Is it really required to create a service for advertising?
  4. In ble_uart_app and ble_uart_app_c examples, what exactly NUS service does? Can I remove it?