BLE APP UART central using NRF52840 eval kit and Fanstel BWG840 gateway gets disconnected using a 0x8 error code while trying to receive data from a peripheral

RE: BLE APP UART central using NRF52840 eval kit and Fanstel BWG840 gateway gets disconnected using a 0x8 error code while trying to receive data from a peripheral

ovrebekk — Thu, 17 Jun 2021 14:40:51 GMT

That's great news, I will consider the case closed then 🙂

RE: BLE APP UART central using NRF52840 eval kit and Fanstel BWG840 gateway gets disconnected using a 0x8 error code while trying to receive data from a peripheral

annamol — Mon, 14 Jun 2021 11:31:00 GMT

Thanks for the support.

Found the issue. It was a minor mistake on my central side code.

switch (p_event->evt_type)
{
/**@snippet [Handling data from UART] */
case APP_UART_DATA_READY:
UNUSED_VARIABLE(app_uart_get(&data_array[index]));
index++;

if ((data_array[index - 1] == '\n') ||
(data_array[index - 1] == '\r') ||
(index >= (m_ble_nus_max_data_len)))
{
NRF_LOG_DEBUG("Ready to send data over BLE NUS");
NRF_LOG_HEXDUMP_DEBUG(data_array, index);

do
{
ret_val = ble_nus_c_string_send(&m_ble_nus_c, data_array, (index));
if ( (ret_val != NRF_ERROR_INVALID_STATE) && (ret_val != NRF_ERROR_RESOURCES) )
{
APP_ERROR_CHECK(ret_val);
}
} while (ret_val == NRF_ERROR_RESOURCES);

index = 0;
}
break;

While playing around with code, I was sending data of size( index-1 ) instead of index.

With index-1 disconnection is present and with size set as index there is no problem

RE: BLE APP UART central using NRF52840 eval kit and Fanstel BWG840 gateway gets disconnected using a 0x8 error code while trying to receive data from a peripheral

ovrebekk — Fri, 11 Jun 2021 14:04:55 GMT

Have you tried to debug the application on the peripheral side to see what happens when the command to stream data is received?

Are you able to share the code that you use to stream the data?

Have you tried to sniff the Bluetooth communication when the problem occurs, to see what happens over the air?
As you may know we provide a Bluetooth sniffer that is free of charge as long as you have a Nordic development kit to run it:
https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE

Best regards
Torbjørn