The following instructions
assume that your application is based on the nRF Connect SDK versions later than 2.0.0.
Note: By default, nRF Connect SDK's modem library uses the UART1
peripheral for trace output. This means that you cannot use UART1 for other purposes
in your application. If this does not work for your application, you must update the
configuration and code of the modem library to use a different UART peripheral for
trace output.