RE: BLE App UART

Vidar Berg — Mon, 11 Feb 2019 13:08:32 GMT

Hi,

The disconnect is likely caused by a reset it your application. Please compile your app with the "DEBUG" flag added to your list of pre-processor definitions, then add a breakpoint in app_error.c::app_error_save_and_stop() to read out the err code, line number, and file name to confirm where the error occurred.

I guess it stems from the call to ble_nus_string_send(). It will return BLE_ERROR_NO_TX_PACKETS if the notification buffer becomes full ( can hold 1-7 packets depending on Softdevice bandwidth configuration). In other words, you will probably have to handle this error in your app. Either pause UART reception while the notification buffer is full, or create a RAM buffer to enable queuing of more notifications packets. However, the latter approach will only work if you are receiving a finite amount of data.

Best regards,

Vidar