nRF52840 Dongle with Raspberry Pi B+ for Beacon scanning

[Ashiq Mohammed]

Team,

For asset tracking I am using nRF52840 Beacons as tags in asserts and Raspberry Pi B+ for scanning Beacon's MAC, UID, Major, Minor, Tx,  and RSSI values.

To calculate Beacon distance with more accuracy I am planning to use 'Channel Diversity' approach, so I want to scan nRF52840 Beacons for any one of specific channel (from 37, 38, 39).  How I can use nRF52840 Dongle along with Raspberry Pi B+ to filter specific channel of nRF52840 Beacon advertisement data.

Ashiq Mohammed

[awneil]

AndreasF said:

Note that using RSSI to calculate distance is very inaccurate

Indeed.

See: https://devzone.nordicsemi.com/f/nordic-q-a/38857/how-to-calculate-the-distance-with-the-rssi-value-and-tx-power/150174#150174

[Ashiq Mohammed]

My question is, I want to send data from nRF52840 Dongle to Raspberry Pi B+, Assume nRF52840 Dongle placed in USB drive of Raspberry Pi B+. Please help with coding sample.

[AndreasF]

Hi Ashiq.

Could you please create a new post and post this question there, as this is another question and maybe other customers are interested in this, I will close this case. And please verify the answer i posted to your first question.

- Andreas

[Ashiq Mohammed]

Andreas , actually If see my question, this is about how I can use nRF52840 Dongle for Beacon scanning not for advertise.

[awneil]

Your question is rather confused - you seem to be asking about three different things all at once!

[AndreasF]

Hi.

I was abit confused about your question, if you want to only scan on one channel:

Then you have to do the same using the ble_gap_cam_params_t structure. For example:

Create a structure:

static ble_gap_scan_params_t m_scan_param; 

In your static void scan_start(void) function, add:

m_scan_param.channel_mask[4] = 0x60; //The code i added to mask channel 37 and 38

Like this:

/**@brief Function for starting scanning. */
static void scan_start(void)
{
    ret_code_t ret;

    m_scan_param.channel_mask[4] = 0x60; //The code i added to mask channel 37 and 38

    ret = sd_ble_gap_scan_start(&m_scan_param, &m_scan_buffer);
    APP_ERROR_CHECK(ret);

    ret = bsp_indication_set(BSP_INDICATE_SCANNING);
    APP_ERROR_CHECK(ret);
}

I did this in the example found in nRF5_SDK_15.2.0_9412b96\examples\ble_central\ble_app_uart_c.

- Andreas