How to communicate via UART from nrf5340 to an external customer board ?

Hi, I am newbie to the nordic world. I am trying to  developing an application that allows me to send data via UART ("not using the ble")from  nordic nRF5340 board and read that data with in the Customer board .

i tried the echo bot application , here the data is loop back untill here i understand the concept , Now i'm transferring the echo data that i was sending from the  nordic nRF5340 to Customer board.

Could someone provide me with an example code (apart from the templates that come in nRF Connect for VS Code) with this configuration? I mean that I can receive data from nordic nrf5340 and read them with the customer board. 

Thanks in advance.
Best regards.

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