how to get and send the RSSI value over ble

[ps_anu]

Hi, 

I am working nRF52832 and sdk 16 version. I want to get the RSSI  value of my peripheral device nRF52832 and send it to central (phone) over ble ? how to do that ? 

Best Regards 

pspavi

[Vidar Berg]

Hi,

Just to make sure, did you consider the option of just reading the RSSI on the phone instead? I don't think it's common to have a peripheral send measured RSSI to the central, and it does complicate things a bit. In any case, you can use the following SD APIs to control RSSI sampling:

sd_ble_gap_rssi_get

sd_ble_gap_rssi_start

[ps_anu]

yes I did , but i am not getting the RSSI stable value , it is varying  ..please let me know how to rectify 

  switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected");
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);

            uint32_t err_code;  
m_conn_handle  = p_ble_evt->evt.gap_evt.conn_handle;  
err_code = sd_ble_gap_rssi_start(m_conn_handle, 10, 0);  
APP_ERROR_CHECK(err_code);  


            break;
 case BLE_GAP_EVT_RSSI_CHANGED:
         
       rssi = p_ble_evt->evt.gap_evt.params.rssi_changed.rssi;
    
NRF_LOG_INFO("rssi:%d",rssi);

[Vidar Berg]

Measured RSSI will vary quite a bit when tested in uncontrolled environments, so the variation you see is probably as expected. To limit this variation you could try calculate an average RSSI from multiple samples.