How to get rssi without connection via central device

[purgoufr]

I use nrf51822 sdk130 (central device) and nrf51822 sdk110(peripheral device). I want to get rssi value of the peripheral device using the central device without connection. Is it possible to read rssi value of peripheral device without connection?

[endnode]

Sure, each scanning event (when you receive ADV_xxx packet) has RSSI value in the event data structure.

[purgoufr]

It automatically connects to the peripheral device when it enters the on_ble_evt function. But I do not want that. I want to read rssi value without entering the peripheral device.Normally, when I press the button, it enters "button_handler" function. Then it use "sd_ble_gap_scan_start(&m_scan_params);" function. After that ,Function for handling the Application's BLE Stack events start automatically(on_ble_evt). Finally connection establihes. But I just want to learn rssi value of peripheral device,nothing else. Can you write some method or function to do that?

[endnode]

You probably deal with some specific FW code or example which I won't help you with but the procedure you are describing is scanning. See following chapter in Infocenter, there is sd_ble_gap_scan_start() function which should cause BLE_GAP_EVT_ADV_REPORT events coming and as you can see in event data you can locate RSSI measured.

[purgoufr]

I try to read rssi like adc_value. I want to keep watching. I have two buttons. I just want to use first button manually. So try to connect every time I press it. When I press the second button(I only pressed the second button once), Central device always search peripheral device and it always try to connect automatically if the rssi value is at a certain level. (Connect to the peripheral device without pressing the button.)

scan_start function ;

static void scan_start(void)
{
    uint32_t err_code;
	
    err_code = sd_ble_gap_scan_start(&m_scan_params);
    APP_ERROR_CHECK(err_code);
    
    err_code = bsp_indication_set(BSP_INDICATE_SCANNING);
    APP_ERROR_CHECK(err_code);
	
}

[endnode]

Yes, this will start the scanning, now you just need to handle incoming events. Good luck!