This example creates a writable characteristic and notifies the user of any writes by printing to the serial. The example will advertise as "GattServer" and await connection.
This example can be used together with BLE_GattClient_CharacteristicWrite running on another board or with
a phone running a BLE scanner application. Either one can connect and write a new value to the writable
characteristic with UUID 0xA001.
As the application runs it will update you about its progress over serial and then proceed to print the value of the writable characteristic every time it's updated.
Hardware requirements are in the main readme.
Building instructions for all samples are in the main readme.