UART Connection between nRF52840 DK and ESP32 CAM

Hi Developer Team,

I am using image sending demo app with a different camera. I can transmit data over uart in ESP32CAM but cannot receive it in nrf52840. It gets random values. Then, I find the error I need to use uart1 to be able to communicate with ESP because uart0 is used to debug. But how can I change it, I could not find. Is there a way that you guys can help? 

I am using Pins 6 and 8.  

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