Exactly the same as you'd do it on any other microcontroller!
You'd need low-level functions to send a character to the UART, and receive a character from a UART. Those are the only parts that are specific to the particular microcontroller.
Above that, you're just handling characters & strings.
The general term is "retargetting" (or "retargeting")
i want to do the similar thing in nordic using termite
char ch[80];
int n;
int array[3] ={peripheral 1 ,peripheral 2,peripheral 3};
printf ("enter the peripheral number whom you want to send the msg");
scanf("%d", n);
printf("enter the message you want to send");
scanf("%s", ch);
