I would like to know how to see in which channel (37,38,39) the BLE device is advertising its data by using nrf52840?

[Lexi]

Hi,

I am using nrf52840 preview DK as a transmitter and try to get rssi by a linux lib. and it works well. and now I want to find advertisement channel number, because the rssi values are different in each channel, please help me and tell in as simple as you can what should I do? I can change my receiver to another things like another nrf52840 preview DK and I just need to know in each scan the value of RSSI and which channel the BLE device is advertising. 

Thanks, 

[Kenneth]

Hi,

I am not aware that this is possible in Linux, but it you can provide what hardware and linux lib you are using, then maybe your question will get search hits by others looking for the same or may have an answer.

Best regards,
Kenneth

[Lexi]

thanks for your reply, it is better to ask my question like this: is there any example code (compatible with nrf52840 preview DK) that give me, the ble rssi and advertising channel in the same time? 

[Kenneth]

Hello,

I highly recommend to buy a new nRF52840-DK, the preview kit (likely containing early hardware revision) is no longer recommended for development. 

If you open a BLE central example in nRF5 SDKv15 I believe this is simply doing it like this:

        case BLE_GAP_EVT_ADV_REPORT:
        {
            int8_t rssi = p_gap_evt->params.adv_report.rssi;
            uint8_t ch_index = p_gap_evt->params.adv_report.ch_index; 
            
            on_adv_report(&p_gap_evt->params.adv_report);
        } break;

Best regards,
Kenneth

 

 

[Lexi]

Thank you so much, just one more question, I can print the values on the terminal by NRF_LOG_INFO,  how can I save them on a text file directly from from main.c  not from terminal?