case about nRF54L15 dtm UART RX TX

Hi,

1. I am testing nRF54L15 PDK PCA10156 0.8.1 Example is: ncs\v2.8.0\nrf\samples\bluetooth\direct_test_mode
2. Which pins can be used as UART TX and which pins can be used as UART RX?
3. How do I switch between TX and RX in the example direct_test_mode code instead of the device tree
4. That is to switch the TX and RX IO ports while the code is running?

Thank you for all your assistance.
Kind regards,
Peter.Min

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