DA14531 - Logging / Printing during Debugging with µKeil5


I am facing some issues while coding the FW for my application and would like to print comments, values, states etc during debugging. Unfortunaltey I can't use printf function neither arch_printf function as the run of the code is stopped in the debugging session when including the functions named above. Is there a way to perform some kind of print to console during debugging with µKeil5? What parameters need to be set and where can I find these? What kind of function do I neet to use to print data to console? 

My development is based on the DA14531 USB Dev Kit and the Code is based on the ble_app_peripheral example project in the SDK 

Thanks in advance,