How can I get rssi before I make a connection?

[purgoufr]

Hello ,

I can read the rssi value after the connection is established.

case BLE_GAP_EVT_CONNECTED:
            APPL_LOG("Connected to target\r\n");
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            
            m_ble_nus_c.conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
						
            // start discovery of services. The NUS Client waits for a discovery result
            err_code = ble_db_discovery_start(&m_ble_db_discovery, p_ble_evt->evt.gap_evt.conn_handle);
            APP_ERROR_CHECK(err_code);	

			sd_ble_gap_rssi_start(p_ble_evt->evt.gap_evt.conn_handle, 0 , 0);

            break;

Then I toggle LEDs according rssi value;

case BLE_GAP_EVT_RSSI_CHANGED:						 
						rssi_value = p_ble_evt->evt.gap_evt.params.rssi_changed.rssi;
						nrf_gpio_pin_clear(LED1);
						nrf_gpio_pin_clear(LED0);
				
						if(rssi_value<-64)
							nrf_gpio_pin_toggle(LED1);
						else if(rssi_value<-48)
							nrf_gpio_pin_toggle(LED0);
						
					break;

But I want to read the rssi value as in the NRFToolbox application before establishing a connection.

nrf_rssi.jpg

[Jørgen Holmefjord]

Hi,

The exact RSSI value is not shown in the scanner in nRF Toolbox, but the RSSI is calculated into percentage and a representative image is used to indicate the strength. You can modify the code of the app to show the RSSI value instead of, or in addition to, the image.

Best regards,

Jørgen

[purgoufr]

I am working on both nrf51 (s130) and nrf52 (s132). Also I use BLE_GAP_EVT_ADV_REPORT and BLE_GaP_EVT_CONNECTED.

case BLE_GAP_EVT_ADV_REPORT:
        {
            const ble_gap_evt_adv_report_t *p_adv_report = &p_gap_evt->params.adv_report;
                        
            if (is_uuid_present(&m_nus_uuid, p_adv_report))
            {    
                err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
                                              &m_scan_params,
                                              &m_connection_param);                    
            }
            break;
        }