scan with UUID filter

RE: scan with UUID filter

AHaug — Wed, 22 May 2024 09:51:16 GMT

Hi Mark,

Apologies for the long response time. There has been 5 days of holidays/weekend here in Norway since my last reply.

[quote user="mark.zhang"]

All samples in that course only implement BLE peripheral on Nordic board, but, I need to use the Nordic board as BLE central, it scans for BLE device with UUID filter, when the mobile device with that service UUID is found, it will connect to it, then, exchange data.

could you provide an sample to implement a BLE central on nRF52840 with Zephry.

[/quote]

As for samples that showcases how to scan for a certain UUID from a centrals perspective, you can have a look at the Central_UART sample where it starts to scan for the UUID of the Nordic UART Service: https://github.com/nrfconnect/sdk-nrf/blob/831e3627aa67890791794ef82588a2d68ce17c0b/samples/bluetooth/central_uart/src/main.c#L488

[quote user="mark.zhang"]The issue was solved, the UUID data order should be reversed.[/quote]

Noted, could you also clarify if this means that your entire inquery has been resolved? If not please let me know if you have any remaining questions not answered!

Kind regards,
Andreas

RE: scan with UUID filter

mark.zhang — Fri, 17 May 2024 22:15:53 GMT

The issue was solved, the UUID data order should be reversed.

RE: scan with UUID filter

mark.zhang — Fri, 17 May 2024 22:02:37 GMT

I may scan my mobile device by filter with name in initialization:

static int scan_init(void)

{

int err;

struct bt_scan_init_param scan_init = {

.connect_if_match = 1,

};

bt_scan_init(&scan_init);

bt_scan_cb_register(&scan_cb);

err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_NAME,"MobileID");

if (err) {

return err;

}

err = bt_scan_filter_enable(BT_SCAN_NAME_FILTER, false);

if (err) {

return err;

}

return err;

}

But, if I change the filter to UUID, no match was found.

I could scan the mobile device with nRF Connect App, the UUID is shown:

00005300-5a07-4768-b762-7394cc35863a.

I used UUID generated as:

#define MOBILEID_SERVICE_UUID BT_UUID_DECLARE_128(0x00, 0x00, 0x53, 0x00, \

0x5a, 0x07, 0x47, 0x68, 0xb7, 0x62, \

0x73, 0x94, 0xcc, 0x35, 0x86, 0x3a)

err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_UUID, MOBILEID_SERVICE_UUID);

please help.

mark,

RE: scan with UUID filter

mark.zhang — Thu, 16 May 2024 22:45:55 GMT

could you provide an sample to implement a BLE central on nRF52840 with Zephry.

Thanks,

Mark,

RE: scan with UUID filter

AHaug — Thu, 16 May 2024 11:36:30 GMT

Hi,

I recommend that you go through the Bluetooth Low Energy Fundamentals course at our academy pages to learn more about the scanning procedure as well as general BLE theory and development: https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/. This course should show you how to scan with UUID filter.

Kind regards,
Andreas