BLE_NUS change UART baudrate at runtime

[gnrboy]

Can you please help i use ble _ nus and after few message i need to change uart baudrate. I cloes uart then init uart with new baudrate parameter but everytime MCU goes to in error handler function. Where will be best to put  new uart initialization. I know that after i send via bluetooth to nrf52840 0x06 0x39 0x36 0x30 0x30 and nrf52840 forward this message on tx  in next 200 ms device connected to nrf52840s uart will respond on new baudrate which i have send that it changes.

[gnrboy]

This is digram of what i need. I have manage that i need to check if  string ( command for change baudrate) occurs and that this command is sent over TX (FIFO is empty) .

 

[gnrboy]

https://devzone.nordicsemi.com/f/nordic-q-a/50498/app_uart_put-check-that-is-transmmited-all-bytes-from-fifo solved here

just in case: APP_UART_TX_EMPTY: add  NRF_UART0->BAUDRATE = (UART_BAUDRATE_BAUDRATE_Baud9600 << UART_BAUDRATE_BAUDRATE_Pos); or some different baudrate