RE: Connecting to ble device based on mac address

Kotteeswaran — Mon, 26 Aug 2019 18:34:21 GMT

Thanks Jared,

Let me try first approach, I am already trying (based on device name).

Let me get back if facing problems.

RE: Connecting to ble device based on mac address

Jared — Sat, 17 Aug 2019 04:39:51 GMT

You can indeed connect by the MAC address but the peripheral device needs to be ready to accept connections. Advertising is usually the way to do this. This is tricky though if you don't know the MAC beforehand.

The easiest way to do this without knowing the MAC address is to filter your scan results. There are a few ways to filter. One is by device name

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

The other is by using the UUID for the service you're targeting

    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_UUID_FILTER, &target_uuid);
    APP_ERROR_CHECK(err_code);

You can set this on the peripheral device by modifying the m_adv_uuids array

// YOUR_JOB: Use UUIDs for service(s) used in your application.
static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE},{PROTOBUF_UUID_SERVICE, BLE_UUID_TYPE_BLE}};

You'll also have to configure the service as well. I went into detail about how to configure a new service on my blog. There's also tons of examples in the SDK under the examples/ble_peripheral folder.

On the central, you'll have to do a device discovery to see if the device indeed has that service. You can also look in the examples/ble_central folder to see how to implement your own. The ble_app_gatts example is good. Look for the scan_filters_set and scan_start.

Hopefully that makes sense. Let me know if I can help explain further. 🙂

Jared
jaredwolff.com