BlueNRG-1: In the BLE_Beacon example, where is the '・' output from UART written in the source code?

[MHara.2]

I write the BLE_Beacon example to BlueNRG-1 and run it, then '・'(dot?) was output every 1sec.from UART. I couldn't find where this output is written in the source code, so if anyone knows, please let me know.