nRF52-DK as CENTRAL not connecting to the device when using filters in ble_app_uart_c

[Juan Gomez]

Hello Nordic team! 

I had a post where I verified the answer by misclick: https://devzone.nordicsemi.com/f/nordic-q-a/83749/nrf52-dk-as-central-to-discover-services-on-peripheral

In resume: I'm working on a discovery service for a custom 128 UUID using the ble_app_uart_c example.

I'm adding the 128 UUID using sd_ble_uuid_vs_add() but the application is not finding this service, and I'm pretty sure I added the custom 128 UUID correctly.

Since the scan_init() is using SCAN_UUID_FILTER and NRF_BLE_SCAN_UUID_FILTER for the filters, I tried the following that worked for me in the past:

static char const m_target_periph_name[] = "M6"; 


//inside scan_init()

// Setting filters for scanning. This way we can find the M6.
err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_NAME_FILTER, false);
APP_ERROR_CHECK(err_code);

err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_NAME_FILTER, m_target_periph_name);
APP_ERROR_CHECK(err_code);

Unfortunately, nrf_ble_scan_filter_set(), is generating an <error> app: Fatal error :( 

So:

1. if I add my custom 128 UUID which I'm pretty sure I did it correctly, it doesn't connect to any device, so discovery never happens

2. if I change the filters_enable and filter_set functions to look for the device name, it generates an error

How should I proceed from here? or what should I be looking at?

Thanks a lot in advance

[Olaf]

Regarding 2.:

What is the error code returned? See https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Fgroup__nrf__ble__scan.html for return values.

What value is set for NRF_BLE_SCAN_NAME_MAX_LEN?

BR

Olaf

[Hung Bui]

Hi Juan, I unblock the other case and we will continue on that. 

[Juan Gomez]

Hello Olaf, thanks a lot for your reply!

The error was that the ble_app_uart_c example doesn't have NRF_BLE_SCAN_NAME_CNT and NRF_BLE_SCAN_ADDRESS_CNT as 1 on the sdk_config.h, so, when nrf_ble_scan_filter_set() was called, it never found those definitions. 

I changed the definitions to 1, and the application is able to find my service and my characteristics, thanks a lot :)

Will continue on the other post, have a great day