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App uart power consumption

Hi,

I am developing on nRF52840 using SDK version 15.0.3  and Softdevice version 6.11

I have observed that the once you initialize the app_uart using 'app_uart_init()' call, the power consumption remains the same even after we call the 'app_uart_close()' to un-initialize. 

Please suggest a solution to turning down the power consumption after closing the app_uart.

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