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I'm very urgent , When PC sends UART data, nRF52810 cannot enter a callback

The production line is waiting , I'm sorry to ask that it's urgent

This debug tools display nRF52810 UART Tx is Successful

If I add the code

case APP_UART_TX_EMPTY:
printf("\r\nTest.\r\n"); 
break;

Then the debug tools will continue to print "Test"

This callback function is entered, but I want to receive data before entering.

Thanks all

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