nRF52840 BLE UART re-connect fail

[miki_h]

Hi, I'm working on the nRF52840 DK and running the ble_app_uart example. I'm connecting to the BLE using the nRF UART V2.0 app and open a terminal. In the terminal I'm sending a large amount of non-stop data which the nRF52840 forwards in BLE to the app. Sometimes when I disconnect and trying to reconnect again is success and sometimes fails, it seems the program which is running on the nRF52840 doesn't reapond: the LED doesn't blinks and you can't see the advertising name. When it happens the only way to be able to reconnect is by disconnecting and connecting the USB cable from the PC. Any ideas what to do?

Thanks, Miki

[Hung Bui]

Most likely the UART buffer was overflowed. Have you really debug ? Put a break point in the app error handler ?

There could be a chance that it was the issue with the segger chip (USB-> UART) crashed. I would suggest to test using better UART-UART solution or reduce the baudrate or use HWFC in your case.