Unable to perform MCUMGR_BT_OTA_DFU with UART on application

Question

Hi,

To prepare our new device, we are using a nrf5340dk board.

For our application, we need to perform DFU over BT.

Si, i following the tutorial https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-bootloaders-and-dfu-fota/topic/exercise-3-fota-over-bluetooth-low-energy/ and everything working well on the board.

So, in my application i add the following line on prj.conf

CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y

And, then, when i want to perform DFU with my android using nrf connect, my device is stuck, and on nrf connect i have the message " Starting DFU" (see pictures below)

and see the last log on console on nrf5340 dk

[00:07:31.898,773] <inf> mcuboot_util: Image index: 0, Swap type: none
[00:07:32.031,677] <inf> mcuboot_util: Image index: 0, Swap type: none
[00:07:32.046,569] <inf> mcuboot_util: Image index: 0, Swap type: none

After some research, i found that if i not enable my uart device, DFU are working well. More precisely if i not enable the rx.

See my code to init uart

int uart1_init(void)
{
    int err;

	if (!device_is_ready(uart1))
    {
		LOG_ERR("UART device not ready\r\n");
		return -1 ;
	}

    err = uart_callback_set(uart1, uart1_cb, NULL);
    if (err)
    {
        return err;
    }

    // DFU working if line below commented
    err = uart_rx_enable(uart1 ,uart1_rx_buf,sizeof(uart1_rx_buf),RX_TIMEOUT_US);
    return err;
}

If i use uart_rx_disable once a connection is detected, then DFU perform working well.

Could you help me on this issue ? I don't want to perform a DFU by UART, but only by BT so disable CONFIG_SERIAL on mcuboot.conf, but still have the same issue.

Thanks in advance,

Best Regards,

Julien F.